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Java 诊断工具 Arthas 进阶教程
本博文来源于学习阿里云知行动手实验室笔记，传送门
写在前面，博主从17年接触到Java，开启半年自学入行，博客名为逆流者blog，希望一直可以保持乐观、积极的学习心态，在编程的世界里逆流而上。
Java 诊断工具 Arthas 进阶教程
Arthas 进阶
我们接着以一个普通的Spring Boot应用为例，演示Arthas命令的详细用法。
启动demo
下载demo-arthas-spring-boot.jar，再用java -jar命令启动：
wget https://code.aliyun.com/middleware-container/handsonLabExternedFiles/raw/master/demo-arthas-spring-boot.jar;java -jar demo-arthas-spring-boot.jar- 1
demo-arthas-spring-boot是一个很简单的spring boot应用，源代码：查看
启动之后，可以官方文档上面的点击查看链接，会跳转一个公网页面：
启动arthas-boot
在新的Terminal 2里，下载arthas-boot.jar，再用java -jar命令启动：
wget https://arthas.aliyun.com/arthas-boot.jar;java -jar arthas-boot.jar --target-ip 0.0.0.0- 1
arthas-boot是Arthas的启动程序，它启动后，会列出所有的Java进程，用户可以选择需要诊断的目标进程。
--2022-07-28 22:36:33-- https://arthas.aliyun.com/arthas-boot.jar Resolving arthas.aliyun.com (arthas.aliyun.com)... 203.119.214.116 Connecting to arthas.aliyun.com (arthas.aliyun.com)|203.119.214.116|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 141872 (139K) [application/java-archive] Saving to: ‘arthas-boot.jar’ arthas-boot.jar 100%[=========================================================================================>] 138.55K 347KB/s in 0.4s 2022-07-28 22:36:34 (347 KB/s) - ‘arthas-boot.jar’ saved [141872/141872] [INFO] arthas-boot version: 3.6.3 [INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER. * [1]: 1266 demo-arthas-spring-boot.jar- 1
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选择第一个进程，输入 1 ，再Enter/回车：
1- 1
[INFO] Start download arthas from remote server: https://arthas.aliyun.com/download/3.6.2?mirror=aliyun [INFO] Download arthas success. [INFO] arthas home: /home/shell/.arthas/lib/3.6.2/arthas [INFO] Try to attach process 1266 [INFO] Attach process 1266 success. [INFO] arthas-client connect 0.0.0.0 3658 ,---. ,------. ,--------.,--. ,--. ,---. ,---. / O \ | .--. ''--. .--'| '--' | / O \ ' .-' | .-. || '--'.' | | | .--. || .-. |`. `-. | | | || |\ \ | | | | | || | | |.-' | `--' `--'`--' '--' `--' `--' `--'`--' `--'`-----' wiki https://arthas.aliyun.com/doc tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html version 3.6.2 main_class pid 1266 time 2022-07-28 22:36:44 [arthas@1266]$- 1
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Attach成功之后，会打印Arthas LOGO。输入 help 可以获取到更多的帮助信息。
help- 1
查看JVM信息
下面介绍Arthas里查看JVM信息的命令。
sysprop
sysprop 可以打印所有的System Properties信息。
sysprop- 1
KEY VALUE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ awt.toolkit sun.awt.X11.XToolkit file.encoding.pkg sun.io java.specification.version 1.8 sun.cpu.isalist sun.jnu.encoding UTF-8 java.class.path demo-arthas-spring-boot.jar java.vm.vendor Private Build sun.arch.data.model 64 java.vendor.url http://java.oracle.com/ catalina.useNaming false user.timezone Asia/Shanghai org.jboss.logging.provider slf4j os.name Linux java.vm.specification.version 1.8 user.country US sun.java.launcher SUN_STANDARD sun.boot.library.path /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64 sun.java.command demo-arthas-spring-boot.jar sun.cpu.endian little user.home /home/shell user.language en java.specification.vendor Oracle Corporation java.home /usr/lib/jvm/java-8-openjdk-amd64/jre file.separator / line.separator java.vm.specification.vendor Oracle Corporation java.specification.name Java Platform API Specification java.awt.graphicsenv sun.awt.X11GraphicsEnvironment java.awt.headless true sun.boot.class.path /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/usr/lib/jvm/java-8-openjdk-amd6 4/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jv m/java-8-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfr.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/class es java.protocol.handler.pkgs org.springframework.boot.loader sun.management.compiler HotSpot 64-Bit Tiered Compilers java.runtime.version 1.8.0_292-8u292-b10-0ubuntu1~18.04-b10 user.name shell path.separator : os.version 3.10.0-957.21.3.el7.x86_64 java.endorsed.dirs /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/endorsed java.runtime.name OpenJDK Runtime Environment file.encoding UTF-8 spring.beaninfo.ignore true java.vm.name OpenJDK 64-Bit Server VM java.vendor.url.bug http://bugreport.sun.com/bugreport/ java.io.tmpdir /tmp catalina.home /tmp/tomcat.2774955006028160993.61000 java.version 1.8.0_292 user.dir /home/shell os.arch amd64 PID 1266 java.vm.specification.name Java Virtual Machine Specification java.awt.printerjob sun.print.PSPrinterJob sun.os.patch.level unknown catalina.base /tmp/tomcat.2774955006028160993.61000 java.library.path /usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib java.vm.info mixed mode java.vendor Private Build java.vm.version 25.292-b10 java.ext.dirs /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext:/usr/java/packages/lib/ext sun.io.unicode.encoding UnicodeLittle java.class.version 52.0- 1
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也可以指定单个key：
sysprop java.version[arthas@1266]$ sysprop java.version KEY VALUE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ java.version 1.8.0_292- 1
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也可以通过grep来过滤：
sysprop | grep user[arthas@1266]$ sysprop | grep user user.timezone Asia/Shanghai user.country US user.home /home/shell user.language en user.name shell user.dir /home/shell- 1
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可以设置新的value：
sysprop testKey testValue[arthas@1266]$ sysprop testKey testValue Successfully changed the system property. KEY VALUE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ testKey testValue- 1
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sysenv
sysenv 命令可以获取到环境变量。和sysprop命令类似。
sysenv- 1
KEY VALUE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PATH /usr/local/nvm/versions/node/v12.13.1/bin:/home/shell/.local/bin:/home/shell/bin:/usr/shell/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin: /usr/bin:/sbin:/bin USE_CLOUD_STORAGE false ACCOUNT_ID 1458456115779729 TZ Asia/Shanghai ALIBABA_CLOUD_VENDOR CloudShell/0.2 CLOUD_SHELL_ROOT_KEY_ID LTAI4G8C8WqQihqKWH6L54Cr ALIYUN_ACCESS_KEY_SECRET 8EXzXhXG4h3cD7LPSo7rEnmg2iZMQyPayg5FHfi14RZw USER_ID 1458456115779729 ALIBABA_CLOUD_ACCESS_KEY_SECRET 8EXzXhXG4h3cD7LPSo7rEnmg2iZMQyPayg5FHfi14RZw GOCACHE /go/.cache/go-build DEFAULT_REGION cn-hangzhou ALICLOUD_REGION cn-hangzhou LOGNAME shell CLOUDSHELL_CONNECT_KEY f5xpj6rgm2wmljak PWD /home/shell NVM_CD_FLAGS CHANNEL_ID OFFICIAL ALICLOUD_ACCOUNT_ID 1458456115779729 ACCESS_KEY_ID TMP.3KeWMvmMVSnTVotxChCeKJd1AF6YEvwFFb4GCSVgyih7bCLFzMPeQWSmjwCgRfgkMmr2obV3USjaZ6MqM5gM3fzHRfpTvN GOPATH /go OLDPWD / ALIYUN_ACCESS_KEY_ID TMP.3KeWMvmMVSnTVotxChCeKJd1AF6YEvwFFb4GCSVgyih7bCLFzMPeQWSmjwCgRfgkMmr2obV3USjaZ6MqM5gM3fzHRfpTvN GEM_HOME /home/shell/.gems REGION cn-hangzhou CLOUDSHELL_TENANT_CERT -----BEGIN CERTIFICATE-----\nMIIDbDCCAlSgAwIBAgIRAPuaKm1M0qoeKIvbd9APAa4wDQYJKoZIhvcNAQELBQAw\nQjEWMBQGA1UECgwNY2xvdWRzaGVsbCBDQTETMBEGA1 UECwwKY2xvdWRzaGVsbDET\nMBEGA1UEAwwKY2xvdWRzaGVsbDAeFw0yMjA3MjYwMTM2MzhaFw0zMjA3MjYwMTM2\nMzhaMEIxFjAUBgNVBAoMDWNsb3Vkc2hlbGwgQ0ExEzARBgN VBAsMCmNsb3Vkc2hl\nbGwxEzARBgNVBAMMCmNsb3Vkc2hlbGwwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw\nggEKAoIBAQChYD604D4aD4CAzWaJ1mQuDgTuZs0AmfNwf8pkCHiy dWlJ3s+312/f\nVPCnqtgJVtDaJwOCQ9ULTeVn1VjJZ3vHdhqgTn2SLnjIIF+ix3jBt+vHvW1J9zVr\n2ZMOpCwGKVTsqqIA8upX6NjTuRAoP3/XSb6cpe+yG1eotMW/MKIdIPXV/ RAFFC+B\nKIi1ETwiBEm65QaxYjG06sxDyqxGFWO+U5OUWnMXyxzvYzJFMYEXctcG7atAMZWj\nww5bXohnEAgroAz4EuaLJPaT9JznRbjFqO5PLtNb/e/B6oZv7k8NEOFHJfTHl9 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34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tl z=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz =01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;3 1:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.sw m=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm =01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01 ;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35 :*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf= 01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36 :*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36: CLOUD_SHELL_ROOT_KEY_SECRET cf4x2LqNAyQXdSqzR5dLUkDrNQQ5VZ SHLVL 3 CLOUDSHELL_PROXY_ACCESS_KEY 48eb4b2b-251c-4e44-ab27-49334355f190 default_serverless_devs_access {"AccountID":"1458456115779729","AccessKeyID":"TMP.3KeWMvmMVSnTVotxChCeKJd1AF6YEvwFFb4GCSVgyih7bCLFzMPeQWSmjwCgRfgkMmr2obV3USjaZ6MqM5gM3f zHRfpTvN","AccessKeySecret":"8EXzXhXG4h3cD7LPSo7rEnmg2iZMQyPayg5FHfi14RZw"} ALIYUN_DEFAULT_REGION cn-hangzhou TERM xterm-256color LANG en_US.UTF-8 GOPROXY https://mirrors.aliyun.com/goproxy/ ALICLOUD_SECRET_KEY 8EXzXhXG4h3cD7LPSo7rEnmg2iZMQyPayg5FHfi14RZw ACCESS_KEY_SECRET 8EXzXhXG4h3cD7LPSo7rEnmg2iZMQyPayg5FHfi14RZw CLOUD_SHELL_LANG zh _ /usr/bin/java ALIBABA_CLOUD_DEFAULT_REGION cn-hangzhou CLOUDSHELL_DOWNLOAD_MAX_SIZE 5368709120 NVM_DIR /usr/local/nvm CLOUD_SHELL true FC_NO_ISOLATION y USER shell GEM_PATH /home/shell/.gems:/var/lib/gems/2.5.0 ALICLOUD_ACCESS_KEY TMP.3KeWMvmMVSnTVotxChCeKJd1AF6YEvwFFb4GCSVgyih7bCLFzMPeQWSmjwCgRfgkMmr2obV3USjaZ6MqM5gM3fzHRfpTvN ALIYUN_USER_AGENT CloudShell/0.2 HOSTNAME 503bf2508c1e MOUNT_FAILED false NVM_BIN /usr/local/nvm/versions/node/v12.13.1/bin TF_PLUGIN_CACHE_DIR /home/shell/.terraform.d/plugin-cache CLOUDSHELL_PROXY_ACCESS_SECRET 62ed338f-2315-406e-81ed-3c0917b6b9dd HOME /home/shell- 1
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jvm
jvm 命令会打印出JVM的各种详细信息。
jvm- 1
RUNTIME ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ MACHINE-NAME 1729@503bf2508c1e JVM-START-TIME 2022-07-28 22:44:38 MANAGEMENT-SPEC-VERSION 1.2 SPEC-NAME Java Virtual Machine Specification SPEC-VENDOR Oracle Corporation SPEC-VERSION 1.8 VM-NAME OpenJDK 64-Bit Server VM VM-VENDOR Private Build VM-VERSION 25.292-b10 INPUT-ARGUMENTS [] CLASS-PATH demo-arthas-spring-boot.jar BOOT-CLASS-PATH /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/usr/lib/jvm/java -8-openjdk-amd64/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-8-openjdk-amd 64/jre/lib/jce.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfr.ja r:/usr/lib/jvm/java-8-openjdk-amd64/jre/classes LIBRARY-PATH /usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/l ib:/usr/lib ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ CLASS-LOADING ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ LOADED-CLASS-COUNT 8551 TOTAL-LOADED-CLASS-COUNT 8551 UNLOADED-CLASS-COUNT 0 IS-VERBOSE false ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ COMPILATION ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ NAME HotSpot 64-Bit Tiered Compilers TOTAL-COMPILE-TIME 19363 [time (ms)] ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ GARBAGE-COLLECTORS ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Copy name : Copy [count/time (ms)] collectionCount : 92 collectionTime : 387 MarkSweepCompact name : MarkSweepCompact [count/time (ms)] collectionCount : 2 collectionTime : 187 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ MEMORY-MANAGERS ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ CodeCacheManager Code Cache Metaspace Manager Metaspace Compressed Class Space Copy Eden Space Survivor Space MarkSweepCompact Eden Space Survivor Space Tenured Gen ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ MEMORY ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ HEAP-MEMORY-USAGE init : 31457280(30.0 MiB) [memory in bytes] used : 44316080(42.3 MiB) committed : 49762304(47.5 MiB) max : 466288640(444.7 MiB) NO-HEAP-MEMORY-USAGE init : 2555904(2.4 MiB) [memory in bytes] used : 65258256(62.2 MiB) committed : 66650112(63.6 MiB) max : -1(-1 B) PENDING-FINALIZE-COUNT 0 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OPERATING-SYSTEM ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OS Linux ARCH amd64 PROCESSORS-COUNT 1 LOAD-AVERAGE 0.75 VERSION 3.10.0-957.21.3.el7.x86_64 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ THREAD ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ COUNT 31 DAEMON-COUNT 29 PEAK-COUNT 31 STARTED-COUNT 38 DEADLOCK-COUNT 0 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ FILE-DESCRIPTOR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ MAX-FILE-DESCRIPTOR-COUNT 1048576 OPEN-FILE-DESCRIPTOR-COUNT 68- 1
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dashboard
dashboard 命令可以查看当前系统的实时数据面板。
dashboard- 1
ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTED DAEMON -1 C1 CompilerThread1 - -1 - 0.67 0.033 0:2.105 false true 45 Timer-for-arthas-dashboard-fa5385e5-3ce2-48 system 5 RUNNABLE 0.38 0.018 0:0.021 false true -1 C2 CompilerThread0 - -1 - 0.37 0.018 0:7.673 false true 43 arthas-NettyHttpTelnetBootstrap-3-2 system 5 RUNNABLE 0.22 0.010 0:0.116 false true -1 VM Periodic Task Thread - -1 - 0.09 0.004 0:0.110 false true -1 VM Thread - -1 - 0.01 0.000 0:0.519 false true 26 http-nio-61000-ClientPoller-0 main 5 RUNNABLE 0.01 0.000 0:0.011 false true 15 NioBlockingSelector.BlockPoller-1 main 5 RUNNABLE 0.01 0.000 0:0.009 false true 28 http-nio-61000-AsyncTimeout main 5 TIMED_WAITING 0.01 0.000 0:0.008 false true 2 Reference Handler system 10 WAITING 0.0 0.000 0:0.009 false true 3 Finalizer system 8 WAITING 0.0 0.000 0:0.015 false true 4 Signal Dispatcher system 9 RUNNABLE 0.0 0.000 0:0.000 false true 31 Attach Listener system 9 RUNNABLE 0.0 0.000 0:0.006 false true 33 arthas-timer system 9 WAITING 0.0 0.000 0:0.000 false true 36 arthas-NettyHttpTelnetBootstrap-3-1 system 5 RUNNABLE 0.0 0.000 0:0.028 false true 37 arthas-NettyWebsocketTtyBootstrap-4-1 system 5 RUNNABLE 0.0 0.000 0:0.001 false true 38 arthas-NettyWebsocketTtyBootstrap-4-2 system 5 RUNNABLE 0.0 0.000 0:0.001 false true 39 arthas-shell-server system 9 TIMED_WAITING 0.0 0.000 0:0.000 false true 40 arthas-session-manager system 9 TIMED_WAITING 0.0 0.000 0:0.000 false true 41 arthas-UserStat system 9 WAITING 0.0 0.000 0:0.000 false true 44 arthas-command-execute system 5 TIMED_WAITING 0.0 0.000 0:0.029 false true 13 ContainerBackgroundProcessor[StandardEngine main 5 TIMED_WAITING 0.0 0.000 0:0.002 false true 14 container-0 main 5 TIMED_WAITING 0.0 0.000 0:0.000 false false 16 http-nio-61000-exec-1 main 5 WAITING 0.0 0.000 0:0.000 false true 17 http-nio-61000-exec-2 main 5 WAITING 0.0 0.000 0:0.000 false true 18 http-nio-61000-exec-3 main 5 WAITING 0.0 0.000 0:0.000 false true 19 http-nio-61000-exec-4 main 5 WAITING 0.0 0.000 0:0.000 false true 20 http-nio-61000-exec-5 main 5 WAITING 0.0 0.000 0:0.000 false true 21 http-nio-61000-exec-6 main 5 WAITING 0.0 0.000 0:0.000 false true 22 http-nio-61000-exec-7 main 5 WAITING 0.0 0.000 0:0.000 false true 23 http-nio-61000-exec-8 main 5 WAITING 0.0 0.000 0:0.000 false true 24 http-nio-61000-exec-9 main 5 WAITING 0.0 0.000 0:0.000 false true 25 http-nio-61000-exec-10 main 5 WAITING 0.0 0.000 0:0.000 false true 27 http-nio-61000-Acceptor-0 main 5 RUNNABLE 0.0 0.000 0:0.000 false true 30 DestroyJavaVM main 5 RUNNABLE 0.0 0.000 0:4.001 false false -1 Service Thread - -1 - 0.0 0.000 0:0.000 false true Memory used total max usage GC heap 45M 47M 444M 10.16% gc.copy.count 92 eden_space 11M 13M 122M 9.55% gc.copy.time(ms) 387 survivor_space 1M 1M 15M 10.61% gc.marksweepcompact.count 2 tenured_gen 31M 32M 306M 10.38% gc.marksweepcompact.time(ms) 187 nonheap 61M 63M -1 97.05% code_cache 11M 12M 240M 4.69% metaspace 45M 45M -1 98.13% compressed_class_space 5M 5M 1024M 0.55% direct 8K 8K - 100.01% mapped 0K 0K - 0.00% Runtime os.name Linux os.version 3.10.0-957.21.3.el7.x86_64 java.version 1.8.0_292 java.home /usr/lib/jvm/java-8-openjdk-amd64/jre systemload.average 0.20 processors 1 timestamp/uptime Thu Jul 28 22:46:48 CST 2022/129s- 1
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输入 q 或者 Ctrl+C 可以退出dashboard命令。
sc/sm 查看已加载的类
下面介绍Arthas里查找已加载类的命令。
sc
sc 命令可以查找到所有JVM已经加载到的类。 如果搜索的是接口，还会搜索所有的实现类。比如查看所有的Filter实现类：
sc javax.servlet.Filter- 1
com.example.demo.arthas.AdminFilterConfig$AdminFilter javax.servlet.Filter org.apache.tomcat.websocket.server.WsFilter org.springframework.boot.web.filter.OrderedCharacterEncodingFilter org.springframework.boot.web.filter.OrderedHiddenHttpMethodFilter org.springframework.boot.web.filter.OrderedHttpPutFormContentFilter org.springframework.boot.web.filter.OrderedRequestContextFilter org.springframework.web.filter.CharacterEncodingFilter org.springframework.web.filter.GenericFilterBean org.springframework.web.filter.HiddenHttpMethodFilter org.springframework.web.filter.HttpPutFormContentFilter org.springframework.web.filter.OncePerRequestFilter org.springframework.web.filter.RequestContextFilter org.springframework.web.servlet.resource.ResourceUrlEncodingFilter Affect(row-cnt:14) cost in 51 ms.- 1
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通过-d参数，可以打印出类加载的具体信息，很方便查找类加载问题。
sc -d javax.servlet.Filter- 1
class-info com.example.demo.arthas.AdminFilterConfig$AdminFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/classes!/ name com.example.demo.arthas.AdminFilterConfig$AdminFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass true isPrimitive false isSynthetic false simple-name AdminFilter modifier static annotation interfaces javax.servlet.Filter super-class +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info javax.servlet.Filter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/tomcat-embed-core-8.5.31.jar!/ name javax.servlet.Filter isInterface true isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name Filter modifier abstract,interface,public annotation interfaces super-class class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.apache.tomcat.websocket.server.WsFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/tomcat-embed-websocket-8.5.31.jar!/ name org.apache.tomcat.websocket.server.WsFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name WsFilter modifier public annotation interfaces javax.servlet.Filter super-class +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.boot.web.filter.OrderedCharacterEncodingFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/ name org.springframework.boot.web.filter.OrderedCharacterEncodingFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name OrderedCharacterEncodingFilter modifier public annotation interfaces org.springframework.core.Ordered super-class +-org.springframework.web.filter.CharacterEncodingFilter +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.boot.web.filter.OrderedHiddenHttpMethodFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/ name org.springframework.boot.web.filter.OrderedHiddenHttpMethodFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name OrderedHiddenHttpMethodFilter modifier public annotation interfaces org.springframework.core.Ordered super-class +-org.springframework.web.filter.HiddenHttpMethodFilter +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.boot.web.filter.OrderedHttpPutFormContentFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/ name org.springframework.boot.web.filter.OrderedHttpPutFormContentFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name OrderedHttpPutFormContentFilter modifier public annotation interfaces org.springframework.core.Ordered super-class +-org.springframework.web.filter.HttpPutFormContentFilter +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.boot.web.filter.OrderedRequestContextFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/ name org.springframework.boot.web.filter.OrderedRequestContextFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name OrderedRequestContextFilter modifier public annotation interfaces org.springframework.core.Ordered super-class +-org.springframework.web.filter.RequestContextFilter +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.web.filter.CharacterEncodingFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-web-4.3.17.RELEASE.jar!/ name org.springframework.web.filter.CharacterEncodingFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name CharacterEncodingFilter modifier public annotation interfaces super-class +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.web.filter.GenericFilterBean code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-web-4.3.17.RELEASE.jar!/ name org.springframework.web.filter.GenericFilterBean isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name GenericFilterBean modifier abstract,public annotation interfaces javax.servlet.Filter,org.springframework.beans.factory.BeanNameAware,org.springframework.context.EnvironmentAware,org.springframework.core.env.Environment Capable,org.springframework.web.context.ServletContextAware,org.springframework.beans.factory.InitializingBean,org.springframework.beans.factory.Disposabl eBean super-class +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.web.filter.HiddenHttpMethodFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-web-4.3.17.RELEASE.jar!/ name org.springframework.web.filter.HiddenHttpMethodFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name HiddenHttpMethodFilter modifier public annotation interfaces super-class +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.web.filter.HttpPutFormContentFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-web-4.3.17.RELEASE.jar!/ name org.springframework.web.filter.HttpPutFormContentFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name HttpPutFormContentFilter modifier public annotation interfaces super-class +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.web.filter.OncePerRequestFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-web-4.3.17.RELEASE.jar!/ name org.springframework.web.filter.OncePerRequestFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name OncePerRequestFilter modifier abstract,public annotation interfaces super-class +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.web.filter.RequestContextFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-web-4.3.17.RELEASE.jar!/ name org.springframework.web.filter.RequestContextFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name RequestContextFilter modifier public annotation interfaces super-class +-org.springframework.web.filter.OncePerRequestFilter +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2 class-info org.springframework.web.servlet.resource.ResourceUrlEncodingFilter code-source file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-webmvc-4.3.17.RELEASE.jar!/ name org.springframework.web.servlet.resource.ResourceUrlEncodingFilter isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name ResourceUrlEncodingFilter modifier public annotation interfaces super-class +-org.springframework.web.filter.GenericFilterBean +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 classLoaderHash 19469ea2- 1
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sc支持通配，比如搜索所有的StringUtils：
sc *StringUtils- 1
[arthas@1729]$ sc *StringUtils com.taobao.arthas.core.util.StringUtils org.apache.tomcat.util.buf.StringUtils org.springframework.util.StringUtils Affect(row-cnt:3) cost in 75 ms.- 1
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sm
sm命令则是查找类的具体函数。比如：
sm java.math.RoundingMode- 1
[arthas@1729]$ sm java.math.RoundingMode java.math.RoundingMode(Ljava/lang/String;II)V java.math.RoundingMode values()[Ljava/math/RoundingMode; java.math.RoundingMode valueOf(I)Ljava/math/RoundingMode; java.math.RoundingMode valueOf(Ljava/lang/String;)Ljava/math/RoundingMode; Affect(row-cnt:4) cost in 20 ms. - 1
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通过-d参数可以打印函数的具体属性：
sm -d java.math.RoundingMode- 1
[arthas@1729]$ sm -d java.math.RoundingMode declaring-class java.math.RoundingMode constructor-namemodifier private annotation parameters java.lang.String int int exceptions classLoaderHash null declaring-class java.math.RoundingMode method-name values modifier public,static annotation parameters return java.math.RoundingMode[] exceptions classLoaderHash null declaring-class java.math.RoundingMode method-name valueOf modifier public,static annotation parameters int return java.math.RoundingMode exceptions classLoaderHash null declaring-class java.math.RoundingMode method-name valueOf modifier public,static annotation parameters java.lang.String return java.math.RoundingMode exceptions classLoaderHash null Affect(row-cnt:4) cost in 26 ms. - 1
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也可以查找特定的函数，比如查找构造函数：
sm java.math.RoundingMode- 1
[arthas@1729]$ sm java.math.RoundingModejava.math.RoundingMode (Ljava/lang/String;II)V Affect(row-cnt:1) cost in 17 ms. - 1
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Jad
可以通过 jad 命令来反编译代码：
jad com.example.demo.arthas.user.UserController- 1
[arthas@1729]$ jad com.example.demo.arthas.user.UserController ClassLoader: +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1 Location: file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/classes!/ /* * Decompiled with CFR. * * Could not load the following classes: * com.example.demo.arthas.user.User * org.slf4j.Logger * org.slf4j.LoggerFactory * org.springframework.web.bind.annotation.GetMapping * org.springframework.web.bind.annotation.PathVariable * org.springframework.web.bind.annotation.RestController */ package com.example.demo.arthas.user; import com.example.demo.arthas.user.User; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RestController; @RestController public class UserController { private static final Logger logger = LoggerFactory.getLogger(UserController.class); @GetMapping(value={"/user/{id}"}) public User findUserById(@PathVariable Integer id) { /*15*/ logger.info("id: {}", (Object)id); /*17*/ if (id != null && id < 1) { throw new IllegalArgumentException("id < 1"); } return new User(id.intValue(), "name" + id); } } Affect(row-cnt:1) cost in 1680 ms.- 1
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通过–source-only参数可以只打印出在反编译的源代码：
jad --source-only com.example.demo.arthas.user.UserController- 1
[arthas@1729]$ jad --source-only com.example.demo.arthas.user.UserController /* * Decompiled with CFR. * * Could not load the following classes: * com.example.demo.arthas.user.User * org.slf4j.Logger * org.slf4j.LoggerFactory * org.springframework.web.bind.annotation.GetMapping * org.springframework.web.bind.annotation.PathVariable * org.springframework.web.bind.annotation.RestController */ package com.example.demo.arthas.user; import com.example.demo.arthas.user.User; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RestController; @RestController public class UserController { private static final Logger logger = LoggerFactory.getLogger(UserController.class); @GetMapping(value={"/user/{id}"}) public User findUserById(@PathVariable Integer id) { /*15*/ logger.info("id: {}", (Object)id); /*17*/ if (id != null && id < 1) { throw new IllegalArgumentException("id < 1"); } return new User(id.intValue(), "name" + id); } }- 1
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Ognl
在Arthas里，有一个单独的ognl命令，可以动态执行代码。
调用static函数
ognl '@java.lang.System@out.println("hello ognl")'- 1
可以检查Terminal 1里的进程输出，可以发现打印出了hello ognl。
查找UserController的ClassLoader
sc -d com.example.demo.arthas.user.UserController | grep classLoaderHash- 1
[arthas@1266]$ sc -d com.example.demo.arthas.user.UserController | grep classLoaderHash classLoaderHash 19469ea2- 1
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注意hashcode是变化的，需要先查看当前的ClassLoader信息，提取对应ClassLoader的hashcode。
如果你使用-c，你需要手动输入hashcode：-c
ognl -c 19469ea2 @com.example.demo.arthas.user.UserController@logger- 1
[arthas@1266]$ ognl -c 19469ea2 @com.example.demo.arthas.user.UserController@logger @Logger[ serialVersionUID=@Long[5454405123156820674], FQCN=@String[ch.qos.logback.classic.Logger], name=@String[com.example.demo.arthas.user.UserController], level=null, effectiveLevelInt=@Integer[20000], parent=@Logger[Logger[com.example.demo.arthas.user]], childrenList=null, aai=null, additive=@Boolean[true], loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]], ]- 1
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对于只有唯一实例的ClassLoader可以通过–classLoaderClass指定class name，使用起来更加方便：
[arthas@1266]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader @org.springframework.boot.SpringApplication@logger @SLF4JLocationAwareLog[ serialVersionUID=@Long[-2379157579039314822], name=@String[org.springframework.boot.SpringApplication], logger=@Logger[Logger[org.springframework.boot.SpringApplication]], FQCN=@String[org.apache.commons.logging.impl.SLF4JLocationAwareLog], ]- 1
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–classLoaderClass 的值是ClassLoader的类名，只有匹配到唯一的ClassLoader实例时才能工作，目的是方便输入通用命令，而-c 是动态变化的。
获取静态类的静态字段
获取UserController类里的logger字段：
ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader @com.example.demo.arthas.user.UserController@logger- 1
[arthas@1266]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader @com.example.demo.arthas.user.UserController@logger @Logger[ serialVersionUID=@Long[5454405123156820674], FQCN=@String[ch.qos.logback.classic.Logger], name=@String[com.example.demo.arthas.user.UserController], level=null, effectiveLevelInt=@Integer[20000], parent=@Logger[Logger[com.example.demo.arthas.user]], childrenList=null, aai=null, additive=@Boolean[true], loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]], ]- 1
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还可以通过-x参数控制返回值的展开层数。比如：
ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -x 2 @com.example.demo.arthas.user.UserController@logger- 1
[arthas@1266]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -x 2 @com.example.demo.arthas.user.UserController@logger @Logger[ serialVersionUID=@Long[5454405123156820674], FQCN=@String[ch.qos.logback.classic.Logger], name=@String[com.example.demo.arthas.user.UserController], level=null, effectiveLevelInt=@Integer[20000], parent=@Logger[ serialVersionUID=@Long[5454405123156820674], FQCN=@String[ch.qos.logback.classic.Logger], name=@String[com.example.demo.arthas.user], level=null, effectiveLevelInt=@Integer[20000], parent=@Logger[Logger[com.example.demo.arthas]], childrenList=@CopyOnWriteArrayList[isEmpty=false;size=1], aai=null, additive=@Boolean[true], loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]], ], childrenList=null, aai=null, additive=@Boolean[true], loggerContext=@LoggerContext[ DEFAULT_PACKAGING_DATA=@Boolean[false], root=@Logger[Logger[ROOT]], size=@Integer[357], noAppenderWarning=@Integer[0], loggerContextListenerList=@ArrayList[isEmpty=false;size=1], loggerCache=@ConcurrentHashMap[isEmpty=false;size=357], loggerContextRemoteView=@LoggerContextVO[LoggerContextVO{name='default', propertyMap={}, birthTime=1659021898283}], turboFilterList=@TurboFilterList[isEmpty=true;size=0], packagingDataEnabled=@Boolean[false], maxCallerDataDepth=@Integer[8], resetCount=@Integer[2], frameworkPackages=@ArrayList[isEmpty=true;size=0], birthTime=@Long[1659021898283], name=@String[default], sm=@BasicStatusManager[ch.qos.logback.core.BasicStatusManager@492fc505], propertyMap=@HashMap[isEmpty=true;size=0], objectMap=@HashMap[isEmpty=false;size=7], configurationLock=@LogbackLock[ch.qos.logback.core.spi.LogbackLock@5b7a4866], scheduledExecutorService=null, scheduledFutures=@ArrayList[isEmpty=true;size=0], lifeCycleManager=@LifeCycleManager[ch.qos.logback.core.LifeCycleManager@4d9e66a3], started=@Boolean[false], ], ]- 1
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执行多行表达式，赋值给临时变量，返回一个List
ognl '#value1=@System@getProperty("java.home"), #value2=@System@getProperty("java.runtime.name"), {#value1, #value2}'- 1
[arthas@1266]$ ognl '#value1=@System@getProperty("java.home"), #value2=@System@getProperty("java.runtime.name"), {#value1, #value2}' @ArrayList[ @String[/usr/lib/jvm/java-8-openjdk-amd64/jre], @String[OpenJDK Runtime Environment], ]- 1
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更多
在Arthas里ognl表达式是很重要的功能，在很多命令里都可以使用ognl表达式。
一些更复杂的用法，可以参考：
OGNL特殊用法请参考：https://github.com/alibaba/arthas/issues/71
OGNL表达式官方指南：https://commons.apache.org/proper/commons-ognl/language-guide.htmlTips
为了更好使用Arthas，下面先介绍Arthas里的一些使用技巧。
帮助信息
Arthas里每一个命令都有详细的帮助信息。可以用-h来查看。帮助信息里有EXAMPLES和WIKI链接。
比如：
sysprop -h- 1
USAGE: sysprop [-h] [property-name] [property-value] SUMMARY: Display, and change the system properties. EXAMPLES: sysprop sysprop file.encoding sysprop production.mode true WIKI: https://arthas.aliyun.com/doc/sysprop OPTIONS: -h, --help this helpproperty name property value - 1
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自动补全
Arthas支持丰富的自动补全功能，在使用有疑惑时，可以输入Tab来获取更多信息。
比如输入 sysprop java. 之后，再输入Tab，会补全出对应的key：
$ sysprop java. java.runtime.name java.protocol.handler.pkgs java.vm.version java.vm.vendor java.vendor.url java.vm.name- 1
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readline的快捷键支持
Arthas支持常见的命令行快捷键，比如Ctrl + A跳转行首，Ctrl + E跳转行尾。
更多的快捷键可以用 keymap 命令查看。
keymap- 1
Shortcut Description Name ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ "\C-a" Ctrl + a beginning-of-line "\C-e" Ctrl + e end-of-line "\C-f" Ctrl + f forward-word "\C-b" Ctrl + b backward-word "\e[D" Left arrow backward-char "\e[C" Right arrow forward-char "\e[A" Up arrow history-search-backward "\e[B" Down arrow history-search-forward "\C-h" Ctrl + h backward-delete-char "\C-?" Ctrl + ? backward-delete-char "\C-u" Ctrl + u undo "\C-d" Ctrl + d delete-char "\C-k" Ctrl + k kill-line "\C-i" Ctrl + i complete "\C-j" Ctrl + j accept-line "\C-m" Ctrl + m accept-line "\C-w" Ctrl + w backward-delete-word "\C-x\e[3~" "\C-x\e[3~" backward-kill-line "\e\C-?" "\e\C-?" backward-kill-word "\e[1~" "\e[1~" beginning-of-line "\e[4~" "\e[4~" end-of-line "\e[5~" "\e[5~" beginning-of-history "\e[6~" "\e[6~" end-of-history "\e[3~" "\e[3~" delete-char "\e[2~" "\e[2~" quoted-insert "\e[7~" "\e[7~" beginning-of-line "\e[8~" "\e[8~" end-of-line "\eOH" "\eOH" beginning-of-line "\eOF" "\eOF" end-of-line "\e[H" "\e[H" beginning-of-line "\e[F" "\e[F" end-of-line- 1
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历史命令的补全
如果想再执行之前的命令，可以在输入一半时，按Up/↑ 或者 Ddown/↓，来匹配到之前的命令。
比如之前执行过sysprop java.version，那么在输入sysprop ja之后，可以输入Up/↑，就会自动补全为sysprop java.version。
如果想查看所有的历史命令，也可以通过 history 命令查看到。
[arthas@1729]$ history 1 sysprop 2 sysprop java.version 3 sysprop | grep user 4 sysprop testKey testValue 5 sysenv 6 jvm 7 dashboard 8 sysprop -h 9 keymap 10 history- 1
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pipeline
Arthas支持在pipeline之后，执行一些简单的命令，比如：
sysprop | grep java[arthas@1729]$ sysprop | grep java java.specification.version 1.8 java.class.path demo-arthas-spring-boot.jar java.vm.vendor Private Build java.vendor.url http://java.oracle.com/ java.vm.specification.version 1.8 sun.java.launcher SUN_STANDARD sun.boot.library.path /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64 sun.java.command demo-arthas-spring-boot.jar java.specification.vendor Oracle Corporation java.home /usr/lib/jvm/java-8-openjdk-amd64/jre java.vm.specification.vendor Oracle Corporation java.specification.name Java Platform API Specification java.awt.graphicsenv sun.awt.X11GraphicsEnvironment java.awt.headless true sun.boot.class.path /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/usr/lib/jvm/java-8-openjdk-amd6 4/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jv m/java-8-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfr.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/class java.protocol.handler.pkgs org.springframework.boot.loader java.runtime.version 1.8.0_292-8u292-b10-0ubuntu1~18.04-b10 java.endorsed.dirs /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/endorsed java.runtime.name OpenJDK Runtime Environment java.vm.name OpenJDK 64-Bit Server VM java.vendor.url.bug http://bugreport.sun.com/bugreport/ java.io.tmpdir /tmp java.version 1.8.0_292 java.vm.specification.name Java Virtual Machine Specification java.awt.printerjob sun.print.PSPrinterJob java.library.path /usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib java.vm.info mixed mode java.vendor Private Build java.vm.version 25.292-b10 java.ext.dirs /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext:/usr/java/packages/lib/ext java.class.version 52.0- 1
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sysprop | wc -l[arthas@1729]$ sysprop | wc -l 64- 1
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案例: 排查函数调用异常
现象
目前，访问 http://localhost:61000/user/0 ，会返回500异常：curl http://localhost:61000/user/0 {"timestamp":1550223186170,"status":500,"error":"Internal Server Error","exception":"java.lang.IllegalArgumentException","message":"id < 1","path":"/user/0"}- 1
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但请求的具体参数，异常栈是什么呢？
查看UserController的 参数/异常
在Arthas里执行：
watch com.example.demo.arthas.user.UserController * '{params, throwExp}'- 1
- 第一个参数是类名，支持通配
- 第二个参数是函数名，支持通配 访问 curl http://localhost:61000/user/0 ,watch命令会打印调用的参数和异常
curl http://localhost:61000/user/0[arthas@1266]$ watch com.example.demo.arthas.user.UserController * '{params, throwExp}' Press Q or Ctrl+C to abort. Affect(class count: 1 , method count: 2) cost in 193 ms, listenerId: 1 method=com.example.demo.arthas.user.UserController.findUserById location=AtExceptionExit ts=2022-07-28 23:37:11; [cost=1.598127ms] result=@ArrayList[ @Object[][isEmpty=false;size=1], @IllegalArgumentException[java.lang.IllegalArgumentException: id < 1], ]- 1
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可以看到实际抛出的异常是
IllegalArgumentException。可以输入 q 或者 Ctrl+C 退出watch命令。
如果想把获取到的结果展开，可以用-x参数：
watch com.example.demo.arthas.user.UserController * '{params, throwExp}' -x 2- 1
[arthas@1266]$ watch com.example.demo.arthas.user.UserController * '{params, throwExp}' -x 2 Press Q or Ctrl+C to abort. Affect(class count: 1 , method count: 2) cost in 56 ms, listenerId: 2 method=com.example.demo.arthas.user.UserController.findUserById location=AtExceptionExit ts=2022-07-28 23:39:20; [cost=8.416671ms] result=@ArrayList[ @Object[][ @Integer[0], ], java.lang.IllegalArgumentException: id < 1 at com.example.demo.arthas.user.UserController.findUserById(UserController.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) , ]- 1
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返回值表达式
在上面的例子里，第三个参数是返回值表达式，它实际上是一个ognl表达式，它支持一些内置对象：
- loader
- clazz
- method
- target
- params
- returnObj
- throwExp
- isBefore
- isThrow
- isReturn
你可以利用这些内置对象来组成不同的表达式。比如返回一个数组：
watch com.example.demo.arthas.user.UserController * '{params[0], target, returnObj}'- 1
[arthas@1266]$ watch com.example.demo.arthas.user.UserController * '{params[0], target, returnObj}' Press Q or Ctrl+C to abort. Affect(class count: 1 , method count: 2) cost in 62 ms, listenerId: 3 method=com.example.demo.arthas.user.UserController.findUserById location=AtExceptionExit ts=2022-07-28 23:42:39; [cost=2.860676ms] result=@ArrayList[ @Integer[0], @UserController[com.example.demo.arthas.user.UserController@128457b8], null, ]- 1
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更多参考： https://arthas.aliyun.com/doc/advice-class.html
条件表达式
watch命令支持在第4个参数里写条件表达式，比如：
watch com.example.demo.arthas.user.UserController * returnObj 'params[0] > 100'- 1
当访问 user/1 (
curl http://localhost:61000/user/1)时，watch命令没有输出当访问 user/101(
curl http://localhost:61000/user/101) 时，watch会打印出结果。[arthas@1266]$ watch com.example.demo.arthas.user.UserController * returnObj 'params[0] > 100' Press Q or Ctrl+C to abort. Affect(class count: 1 , method count: 2) cost in 44 ms, listenerId: 4 method=com.example.demo.arthas.user.UserController.findUserById location=AtExit ts=2022-07-28 23:45:36; [cost=0.313823ms] result=@User[ id=@Integer[101], name=@String[name101], ]- 1
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当异常时捕获
watch命令支持-e选项，表示只捕获抛出异常时的请求：
watch com.example.demo.arthas.user.UserController * "{params[0],throwExp}" -e- 1
执行两个请求：
shell@Alicloud:~$ curl http://localhost:61000/user/1 {"id":1,"name":"name1"} shell@Alicloud:~$ curl http://localhost:61000/user/0 {"timestamp":1659023295622,"status":500,"error":"Internal Server Error","exception":"java.lang.IllegalArgumentException","message":"id < 1","path":"/user/0"}shell@Alicloud:~$- 1
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[arthas@1266]$ watch com.example.demo.arthas.user.UserController * "{params[0],throwExp}" -e Press Q or Ctrl+C to abort. Affect(class count: 1 , method count: 2) cost in 55 ms, listenerId: 5 method=com.example.demo.arthas.user.UserController.findUserById location=AtExceptionExit ts=2022-07-28 23:48:15; [cost=0.359706ms] result=@ArrayList[ @Integer[0], @IllegalArgumentException[java.lang.IllegalArgumentException: id < 1], ]- 1
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可以看到id为0的报了异常
按照耗时进行过滤
watch命令支持按请求耗时进行过滤，比如：
watch com.example.demo.arthas.user.UserController * '{params, returnObj}' '#cost>200'- 1
上面表示大于 200ms
案例: 热更新代码
下面介绍通过
jad/mc/redefine命令实现动态更新代码的功能。目前，访问 http://localhost:61000/user/0 ，会返回500异常：
curl http://localhost:61000/user/0 {"timestamp":1550223186170,"status":500,"error":"Internal Server Error","exception":"java.lang.IllegalArgumentException","message":"id < 1","path":"/user/0"}- 1
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下面通过热更新代码，修改这个逻辑。
jad反编译UserController
jad --source-only com.example.demo.arthas.user.UserController > /tmp/UserController.java- 1
jad反编译的结果保存在 /tmp/UserController.java文件里了。
再打开一个Terminal 3，然后用vim来编辑/tmp/UserController.java：
vim /tmp/UserController.java- 1
比如当 user id 小于1时，也正常返回，不抛出异常：
@GetMapping(value={"/user/{id}"}) public User findUserById(@PathVariable Integer id) { logger.info("id: {}", (Object)id); if (id != null && id < 1) { return new User(id, "name" + id); // throw new IllegalArgumentException("id < 1"); } return new User(id.intValue(), "name" + id); }- 1
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sc查找加载UserController的ClassLoader
sc -d *UserController | grep classLoaderHash- 1
[arthas@1265]$ sc -d *UserController | grep classLoaderHash classLoaderHash 19469ea2- 1
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可以发现是 spring boot LaunchedURLClassLoader@19469ea2 加载的。
请记下你的classLoaderHash，后面需要使用它。在这里，它是 19469ea2。
mc
保存好/tmp/UserController.java之后，使用mc(Memory Compiler)命令来编译，并且通过-c或者–classLoaderClass参数指定ClassLoader：
mc --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader /tmp/UserController.java -d /tmp- 1
[arthas@1265]$ mc --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader /tmp/UserController.java -d /tmp Memory compiler output: /tmp/com/example/demo/arthas/user/UserController.class Affect(row-cnt:1) cost in 3587 ms.- 1
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也可以通过
mc -c，使用-c参数指定ClassLoaderHash:/tmp/UserController.java -d /tmp mc -c 19469ea2 /tmp/UserController.java -d /tmp- 1
[arthas@1265]$ mc -c 19469ea2 /tmp/UserController.java -d /tmp Memory compiler output: /tmp/com/example/demo/arthas/user/UserController.class Affect(row-cnt:1) cost in 2023 ms.- 1
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redefine
再使用redefine命令重新加载新编译好的UserController.class：
redefine /tmp/com/example/demo/arthas/user/UserController.class- 1
[arthas@1265]$ redefine /tmp/com/example/demo/arthas/user/UserController.class redefine success, size: 1, classes: com.example.demo.arthas.user.UserController- 1
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热修改代码结果
redefine成功之后，再次访问 user/0 ，结果是：{ "id": 0, "name": "name0" }- 1
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案例: 动态更新应用Logger Level
在这个案例里，动态修改应用的Logger Level。
查找UserController的ClassLoader
sc -d com.example.demo.arthas.user.UserController | grep classLoaderHash- 1
[arthas@1265]$ sc -d com.example.demo.arthas.user.UserController | grep classLoaderHash classLoaderHash 19469ea2- 1
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用ognl获取logger
ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger'- 1
[arthas@1265]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger' @Logger[ serialVersionUID=@Long[5454405123156820674], FQCN=@String[ch.qos.logback.classic.Logger], name=@String[com.example.demo.arthas.user.UserController], level=null, effectiveLevelInt=@Integer[20000], parent=@Logger[Logger[com.example.demo.arthas.user]], childrenList=null, aai=null, additive=@Boolean[true], loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]], ]- 1
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可以知道UserController@logger实际使用的是logback。可以看到level=null，则说明实际最终的level是从root logger里来的。
单独设置UserController的logger level
ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger.setLevel(@ch.qos.logback.classic.Level@DEBUG)'- 1
[arthas@1265]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger.setLevel(@ch.qos.logback.classic.Level@DEBUG)' null- 1
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再次获取UserController@logger，可以发现已经是DEBUG了：
[arthas@1265]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger' @Logger[ serialVersionUID=@Long[5454405123156820674], FQCN=@String[ch.qos.logback.classic.Logger], name=@String[com.example.demo.arthas.user.UserController], level=@Level[DEBUG], effectiveLevelInt=@Integer[10000], parent=@Logger[Logger[com.example.demo.arthas.user]], childrenList=null, aai=null, additive=@Boolean[true], loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]], ]- 1
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修改logback的全局logger level
通过获取root logger，可以修改全局的logger level：
ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@org.slf4j.LoggerFactory@getLogger("root").setLevel(@ch.qos.logback.classic.Level@DEBUG)'- 1
[arthas@1265]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@org.slf4j.LoggerFactory@getLogger("root").setLevel(@ch.qos.logback.classic.Level@DEBUG)' null- 1
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案例: 排查logger冲突问题
在这个案例里，展示排查logger冲突的方法。
确认应用使用的logger系统
以UserController为例，它使用的是slf4j api，但实际使用到的logger系统是logback。
ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger'- 1
[arthas@1265]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger' @Logger[ serialVersionUID=@Long[5454405123156820674], FQCN=@String[ch.qos.logback.classic.Logger], name=@String[com.example.demo.arthas.user.UserController], level=@Level[DEBUG], effectiveLevelInt=@Integer[10000], parent=@Logger[Logger[com.example.demo.arthas.user]], childrenList=null, aai=null, additive=@Boolean[true], loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]], ]- 1
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获取logback实际加载的配置文件
ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '#map1=@org.slf4j.LoggerFactory@getLogger("root").loggerContext.objectMap, #map1.get("CONFIGURATION_WATCH_LIST")'- 1
[arthas@1265]$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '#map1=@org.slf4j.LoggerFactory@getLogger("root").loggerContext.objectMap, #map1.get("CONFIGURATION_WATCH_LIST")' @ConfigurationWatchList[ mainURL=@URL[jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/classes!/logback-spring.xml], fileWatchList=@ArrayList[isEmpty=true;size=0], lastModifiedList=@ArrayList[isEmpty=true;size=0], noContextWarning=@Integer[0], context=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]], declaredOrigin=@ConfigurationWatchList[ch.qos.logback.core.joran.spi.ConfigurationWatchList@7ec933f], ]- 1
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从这一行
mainURL=@URL[jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/classes!/logback-spring.xml],可以看出时间加载配置文件使用classloader命令查找可能存在的logger配置文件
classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml- 1
[arthas@1265]$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/classes!/logback-spring.xml Affect(row-cnt:1) cost in 4 ms.- 1
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可以知道加载的配置的具体来源。
可以尝试加载容易冲突的文件：
[arthas@1265]$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback.xml Affect(row-cnt:0) cost in 7 ms. [arthas@1265]$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r log4j.properties Affect(row-cnt:0) cost in 3 ms.- 1
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·cnt:0· 显示没有这些冲突的文件
案例: 获取Spring Context
在这个案例里，展示获取spring context，再获取bean，然后调用函数。
使用tt命令获取到spring context
tt即 TimeTunnel，它可以记录下指定方法每次调用的入参和返回信息，并能对这些不同的时间下调用进行观测。
命令详细地址：https://arthas.aliyun.com/doc/tt.html
tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter invokeHandlerMethod- 1
访问：
curl http://localhost:61000/user/1可以看到tt命令捕获到了一个请求：
[arthas@1265]$ tt -t org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter invokeHandlerMethod Press Q or Ctrl+C to abort. Affect(class count: 1 , method count: 1) cost in 246 ms, listenerId: 1 INDEX TIMESTAMP COST(ms) IS-RET IS-EX OBJECT CLASS METHOD P ----------------------------------------------------------------------------------------------------------------------------- 1000 2022-07-31 10:58: 272.2165 true false 0x1fbfb464 RequestMappingHandlerAdapte invokeHandlerMethod 44 08 r- 1
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使用tt命令从调用记录里获取到spring context
输入 q 或者 Ctrl + C 退出上面的 tt -t命令。tt -i 1000 -w 'target.getApplicationContext()'- 1
[arthas@1265]$ tt -i 1000 -w 'target.getApplicationContext()' @AnnotationConfigEmbeddedWebApplicationContext[ reader=@AnnotatedBeanDefinitionReader[org.springframework.context.annotation.AnnotatedBeanDefinitionReader@3d0af4e0], scanner=@ClassPathBeanDefinitionScanner[org.springframework.context.annotation.ClassPathBeanDefinitionScanner@36a60ad0], annotatedClasses=null, basePackages=null, logger=@SLF4JLocationAwareLog[org.apache.commons.logging.impl.SLF4JLocationAwareLog@6c5d518f], DISPATCHER_SERVLET_NAME=@String[dispatcherServlet], embeddedServletContainer=@TomcatEmbeddedServletContainer[org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer@6d920dec], servletConfig=null, namespace=null, servletContext=@ApplicationContextFacade[org.apache.catalina.core.ApplicationContextFacade@7d5594a], themeSource=@ResourceBundleThemeSource[org.springframework.ui.context.support.ResourceBundleThemeSource@12333ea], beanFactory=@DefaultListableBeanFactory[org.springframework.beans.factory.support.DefaultListableBeanFactory@dcf3e99: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory,demoArthasApplication,org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory,adminFilterConfig,userController,serviceMonitor,helloWorldService,welcomeController,tomcatConfiguration,testFilter,staticResourceCustomizer,org.springframework.boot.autoconfigure.AutoConfigurationPackages,org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,org.springframework.boot.autoconfigure.condition.BeanTypeRegistry,propertySourcesPlaceholderConfigurer,org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration,standardJacksonObjectMapperBuilderCustomizer,spring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonProperties,org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor,org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.store,org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperBuilderConfiguration,jacksonObjectMapperBuilder,org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration$JacksonObjectMapperConfiguration,jacksonObjectMapper,org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,jsonComponentModule,org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration$TomcatWebSocketConfiguration,websocketContainerCustomizer,org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration,org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration$EmbeddedTomcat,tomcatEmbeddedServletContainerFactory,org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration,embeddedServletContainerCustomizerBeanPostProcessor,errorPageRegistrarBeanPostProcessor,org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration$DispatcherServletConfiguration,dispatcherServlet,spring.mvc-org.springframework.boot.autoconfigure.web.WebMvcProperties,org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration$DispatcherServletRegistrationConfiguration,dispatcherServletRegistration,org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration,org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,defaultValidator,methodValidationPostProcessor,org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$DefaultErrorViewResolverConfiguration,conventionErrorViewResolver,org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration,errorAttributes,basicErrorController,errorPageCustomizer,preserveErrorControllerTargetClassPostProcessor,spring.resources-org.springframework.boot.autoconfigure.web.ResourceProperties,org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration,requestMappingHandlerAdapter,requestMappingHandlerMapping,mvcValidator,mvcContentNegotiationManager,mvcPathMatcher,mvcUrlPathHelper,viewControllerHandlerMapping,beanNameHandlerMapping,resourceHandlerMapping,mvcResourceUrlProvider,defaultServletHandlerMapping,mvcConversionService,mvcUriComponentsContributor,httpRequestHandlerAdapter,simpleControllerHandlerAdapter,handlerExceptionResolver,mvcViewResolver,mvcHandlerMappingIntrospector,org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter$FaviconConfiguration,faviconHandlerMapping,faviconRequestHandler,org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter,defaultViewResolver,viewResolver,welcomePageHandlerMapping,requestContextFilter,org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration,hiddenHttpMethodFilter,httpPutFormContentFilter,org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,mbeanExporter,objectNamingStrategy,mbeanServer,org.springframework.boot.autoconfigure.aop.AopAutoConfiguration$JdkDynamicAutoProxyConfiguration,org.springframework.aop.config.internalAutoProxyCreator,org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration,stringHttpMessageConverter,spring.http.encoding-org.springframework.boot.autoconfigure.web.HttpEncodingProperties,org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration,mappingJackson2HttpMessageConverter,org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration,org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration,messageConverters,org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration$FreeMarkerWebConfiguration,freeMarkerConfigurer,freeMarkerConfiguration,freeMarkerViewResolver,org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,spring.freemarker-org.springframework.boot.autoconfigure.freemarker.FreeMarkerProperties,org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,spring.info-org.springframework.boot.autoconfigure.info.ProjectInfoProperties,org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration,characterEncodingFilter,localeCharsetMappingsCustomizer,org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration,multipartConfigElement,multipartResolver,spring.http.multipart-org.springframework.boot.autoconfigure.web.MultipartProperties,org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration,serverProperties,duplicateServerPropertiesDetector,org.springframework.boot.autoconfigure.web.WebClientAutoConfiguration$RestTemplateConfiguration,restTemplateBuilder,org.springframework.boot.autoconfigure.web.WebClientAutoConfiguration]; root of factory hierarchy], resourceLoader=null, customClassLoader=@Boolean[false], refreshed=@AtomicBoolean[true], MESSAGE_SOURCE_BEAN_NAME=@String[messageSource], LIFECYCLE_PROCESSOR_BEAN_NAME=@String[lifecycleProcessor], APPLICATION_EVENT_MULTICASTER_BEAN_NAME=@String[applicationEventMulticaster], logger=@SLF4JLocationAwareLog[org.apache.commons.logging.impl.SLF4JLocationAwareLog@774db68], id=@String[application:61000], displayName=@String[org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@2d38eb89], parent=null, environment=@StandardServletEnvironment[StandardServletEnvironment {activeProfiles=[], defaultProfiles=[default], propertySources=[MapPropertySource {name='server.ports'}, StubPropertySource {name='servletConfigInitParams'}, ServletContextPropertySource {name='servletContextInitParams'}, MapPropertySource {name='systemProperties'}, SystemEnvironmentPropertySource {name='systemEnvironment'}, RandomValuePropertySource {name='random'}, PropertiesPropertySource {name='applicationConfig: [classpath:/application.properties]'}]}], beanFactoryPostProcessors=@ArrayList[isEmpty=false;size=3], startupDate=@Long[1659236159627], active=@AtomicBoolean[true], closed=@AtomicBoolean[false], startupShutdownMonitor=@Object[java.lang.Object@7a744b07], shutdownHook=@[Thread[Thread-3,5,main]], resourcePatternResolver=@ServletContextResourcePatternResolver[org.springframework.web.context.support.ServletContextResourcePatternResolver@5746420a], lifecycleProcessor=@DefaultLifecycleProcessor[org.springframework.context.support.DefaultLifecycleProcessor@4f62876b], messageSource=@DelegatingMessageSource[org.springframework.context.support.DelegatingMessageSource@6e6cba74], applicationEventMulticaster=@SimpleApplicationEventMulticaster[org.springframework.context.event.SimpleApplicationEventMulticaster@3618f8cd], applicationListeners=@LinkedHashSet[isEmpty=false;size=14], earlyApplicationEvents=null, classLoader=@LaunchedURLClassLoader[org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2], protocolResolvers=@LinkedHashSet[isEmpty=true;size=0], ] Affect(row-cnt:1) cost in 157 ms.- 1
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获取spring bean，并调用函数
tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()'- 1
结果是：
[arthas@1265]$ tt -i 1000 -w 'target.getApplicationContext().getBean("helloWorldService").getHelloMessage()' @String[Hello World] Affect(row-cnt:1) cost in 4 ms.- 1
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案例: 排查HTTP请求返回401
在这个案例里，展示排查HTTP 401问题的技巧。
访问：
curl http://localhost:61000/admin结果是：
Something went wrong: 401 Unauthorized- 1
我们知道401通常是被权限管理的Filter拦截了，那么到底是哪个Filter处理了这个请求，返回了401？
跟踪所有的Filter函数
开始trace：
trace javax.servlet.Filter *- 1
访问：
curl http://localhost:61000/admin可以在调用树的最深层，找到AdminFilterConfig$AdminFilter返回了401：
Press Q or Ctrl+C to abort. Affect(class count: 14 , method count: 75) cost in 892 ms, listenerId: 2 `---ts=2022-07-31 11:08:04;thread_name=http-nio-61000-exec-8;id=17;is_daemon=true;priority=5;TCCL=org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedWebappClassLoader@34810d7e `---[11.727949ms] org.springframework.web.filter.OncePerRequestFilter:doFilter() +---[1.43% 0.168039ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() #95 | `---[85.07% 0.142946ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() | `---[76.02% 0.108668ms ] org.springframework.web.filter.OncePerRequestFilter:getFilterName() #161 | `---[61.56% 0.066899ms ] org.springframework.web.filter.GenericFilterBean:getFilterName() | `---[34.64% 0.023177ms ] javax.servlet.FilterConfig:getFilterName() #293 +---[0.19% 0.022219ms ] javax.servlet.ServletRequest:getAttribute() #96 +---[1.72% 0.2018ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() #98 | `---[90.48% 0.18258ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() | +---[77.33% 0.141193ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() #118 | | `---[87.16% 0.123059ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() | | +---[63.62% 0.078291ms ] org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager() #137 | | `---[7.03% 0.008655ms ] org.springframework.web.context.request.async.WebAsyncManager:hasConcurrentResult() #137 | `---[7.41% 0.013537ms ] javax.servlet.http.HttpServletRequest:getAttribute() #121 +---[0.23% 0.026399ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() #98 | `---[17.61% 0.004648ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() +---[0.20% 0.023243ms ] javax.servlet.ServletRequest:setAttribute() #105 +---[94.52% 11.085815ms ] org.springframework.web.filter.OncePerRequestFilter:doFilterInternal() #107 | `---[99.77% 11.060142ms ] org.springframework.web.filter.CharacterEncodingFilter:doFilterInternal() | +---[0.26% 0.028245ms ] org.springframework.web.filter.CharacterEncodingFilter:getEncoding() #188 | | `---[32.41% 0.009153ms ] org.springframework.web.filter.CharacterEncodingFilter:getEncoding() | +---[0.21% 0.023577ms ] org.springframework.web.filter.CharacterEncodingFilter:isForceRequestEncoding() #190 | | `---[32.24% 0.007601ms ] org.springframework.web.filter.CharacterEncodingFilter:isForceRequestEncoding() | +---[0.13% 0.01429ms ] javax.servlet.http.HttpServletRequest:setCharacterEncoding() #191 | +---[0.18% 0.020444ms ] org.springframework.web.filter.CharacterEncodingFilter:isForceResponseEncoding() #193 | | `---[24.96% 0.005102ms ] org.springframework.web.filter.CharacterEncodingFilter:isForceResponseEncoding() | `---[98.76% 10.922827ms ] javax.servlet.FilterChain:doFilter() #197 | `---[99.74% 10.894521ms ] org.springframework.web.filter.OncePerRequestFilter:doFilter() | +---[0.54% 0.058318ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() #95 | | `---[80.10% 0.046711ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() | | `---[74.74% 0.03491ms ] org.springframework.web.filter.OncePerRequestFilter:getFilterName() #161 | | `---[47.55% 0.016599ms ] org.springframework.web.filter.GenericFilterBean:getFilterName() | | `---[33.96% 0.005637ms ] javax.servlet.FilterConfig:getFilterName() #293 | +---[0.06% 0.006133ms ] javax.servlet.ServletRequest:getAttribute() #96 | +---[0.73% 0.079293ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() #98 | | `---[85.13% 0.067502ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() | | +---[59.29% 0.040022ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() #118 | | | `---[70.97% 0.028404ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() | | | +---[19.93% 0.005662ms ] org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager() #137 | | | `---[16.29% 0.004628ms ] org.springframework.web.context.request.async.WebAsyncManager:hasConcurrentResult() #137 | | `---[9.06% 0.006118ms ] javax.servlet.http.HttpServletRequest:getAttribute() #121 | +---[0.27% 0.029301ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() #98 | | `---[15.14% 0.004436ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() | +---[0.07% 0.007503ms ] javax.servlet.ServletRequest:setAttribute() #105 | +---[97.79% 10.653682ms ] org.springframework.web.filter.OncePerRequestFilter:doFilterInternal() #107 | | `---[99.80% 10.632739ms ] org.springframework.web.filter.HiddenHttpMethodFilter:doFilterInternal() | | +---[0.90% 0.096057ms ] javax.servlet.http.HttpServletRequest:getMethod() #74 | | `---[98.67% 10.490869ms ] javax.servlet.FilterChain:doFilter() #81 | | `---[99.71% 10.460729ms ] org.springframework.web.filter.OncePerRequestFilter:doFilter() | | +---[0.88% 0.091861ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() #95 | | | `---[84.71% 0.077811ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() | | | `---[84.89% 0.066053ms ] org.springframework.web.filter.OncePerRequestFilter:getFilterName() #161 | | | `---[49.47% 0.032676ms ] org.springframework.web.filter.GenericFilterBean:getFilterName() | | | `---[27.58% 0.009013ms ] javax.servlet.FilterConfig:getFilterName() #293 | | +---[0.08% 0.008042ms ] javax.servlet.ServletRequest:getAttribute() #96 | | +---[0.79% 0.082689ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() #98 | | | `---[84.96% 0.070255ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() | | | +---[61.97% 0.043534ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() #118 | | | | `---[68.51% 0.029826ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() | | | | +---[19.84% 0.005917ms ] org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager() #137 | | | | `---[16.33% 0.00487ms ] org.springframework.web.context.request.async.WebAsyncManager:hasConcurrentResult() #137 | | | `---[9.21% 0.006467ms ] javax.servlet.http.HttpServletRequest:getAttribute() #121 | | +---[0.18% 0.018508ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() #98 | | | `---[24.56% 0.004545ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() | | +---[0.08% 0.008386ms ] javax.servlet.ServletRequest:setAttribute() #105 | | +---[97.41% 10.189293ms ] org.springframework.web.filter.OncePerRequestFilter:doFilterInternal() #107 | | | `---[99.78% 10.167312ms ] org.springframework.web.filter.HttpPutFormContentFilter:doFilterInternal() | | | +---[0.23% min=0.006886ms,max=0.01665ms,total=0.023536ms,count=2] javax.servlet.http.HttpServletRequest:getMethod() #94 | | | `---[99.29% 10.094763ms ] javax.servlet.FilterChain:doFilter() #109 | | | `---[99.78% 10.072333ms ] org.springframework.web.filter.OncePerRequestFilter:doFilter() | | | +---[0.50% 0.050747ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() #95 | | | | `---[77.53% 0.039345ms ] org.springframework.web.filter.OncePerRequestFilter:getAlreadyFilteredAttributeName() | | | | `---[71.66% 0.028196ms ] org.springframework.web.filter.OncePerRequestFilter:getFilterName() #161 | | | | `---[57.42% 0.016189ms ] org.springframework.web.filter.GenericFilterBean:getFilterName() | | | | `---[29.68% 0.004805ms ] javax.servlet.FilterConfig:getFilterName() #293 | | | +---[0.06% 0.006146ms ] javax.servlet.ServletRequest:getAttribute() #96 | | | +---[0.75% 0.075631ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() #98 | | | | `---[84.09% 0.063599ms ] org.springframework.web.filter.OncePerRequestFilter:skipDispatch() | | | | +---[63.14% 0.040154ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() #118 | | | | | `---[71.90% 0.028871ms ] org.springframework.web.filter.OncePerRequestFilter:isAsyncDispatch() | | | | | +---[20.31% 0.005865ms ] org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager() #137 | | | | | `---[16.89% 0.004875ms ] org.springframework.web.context.request.async.WebAsyncManager:hasConcurrentResult() #137 | | | | `---[9.31% 0.005924ms ] javax.servlet.http.HttpServletRequest:getAttribute() #121 | | | +---[0.17% 0.016676ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() #98 | | | | `---[26.94% 0.004492ms ] org.springframework.web.filter.OncePerRequestFilter:shouldNotFilter() | | | +---[0.08% 0.007673ms ] javax.servlet.ServletRequest:setAttribute() #105 | | | +---[97.61% 9.83128ms ] org.springframework.web.filter.OncePerRequestFilter:doFilterInternal() #107 | | | | `---[99.74% 9.805524ms ] org.springframework.web.filter.RequestContextFilter:doFilterInternal() | | | | +---[0.27% 0.026736ms ] org.springframework.web.context.request.ServletRequestAttributes:<init>() #95 | | | | +---[1.83% 0.179362ms ] org.springframework.web.filter.RequestContextFilter:initContextHolders() #96 | | | | | `---[89.38% 0.160307ms ] org.springframework.web.filter.RequestContextFilter:initContextHolders() | | | | | +---[16.07% 0.025762ms ] javax.servlet.http.HttpServletRequest:getLocale() #111 | | | | | +---[18.79% 0.030129ms ] org.springframework.context.i18n.LocaleContextHolder:setLocale() #111 | | | | | +---[17.73% 0.028421ms ] org.springframework.web.context.request.RequestContextHolder:setRequestAttributes() #112 | | | | | `---[16.03% 0.02569ms ] org.apache.commons.logging.Log:isDebugEnabled() #113 | | | | +---[96.32% 9.444643ms ] javax.servlet.FilterChain:doFilter() #99 | | | | | `---[1.12% 0.105421ms ] com.example.demo.arthas.AdminFilterConfig$AdminFilter:doFilter() | | | | | `---[38.80% 0.040903ms ] javax.servlet.http.HttpServletResponse:sendError() #38 | | | | +---[0.68% 0.066797ms ] org.springframework.web.filter.RequestContextFilter:resetContextHolders() #102 | | | | | `---[75.50% 0.050435ms ] org.springframework.web.filter.RequestContextFilter:resetContextHolders() | | | | | +---[41.78% 0.021073ms ] org.springframework.context.i18n.LocaleContextHolder:resetLocaleContext() #119 | | | | | `---[20.19% 0.010185ms ] org.springframework.web.context.request.RequestContextHolder:resetRequestAttributes() #120 | | | | +---[0.06% 0.005758ms ] org.apache.commons.logging.Log:isDebugEnabled() #103 | | | | `---[0.20% 0.01992ms ] org.springframework.web.context.request.ServletRequestAttributes:requestCompleted() #106 | | | `---[0.26% 0.0266ms ] javax.servlet.ServletRequest:removeAttribute() #111 | | `---[0.06% 0.006689ms ] javax.servlet.ServletRequest:removeAttribute() #111 | `---[0.06% 0.006431ms ] javax.servlet.ServletRequest:removeAttribute() #111 `---[0.05% 0.005963ms ] javax.servlet.ServletRequest:removeAttribute() #111- 1
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通过stack获取调用栈
上面是通过trace命令来获取信息，从结果里，我们可以知道通过stack跟踪HttpServletResponse:sendError()，同样可以知道是哪个Filter返回了401
执行：
stack javax.servlet.http.HttpServletResponse sendError 'params[0]==401'- 1
访问：
curl http://localhost:61000/admin[arthas@1265]$ stack javax.servlet.http.HttpServletResponse sendError 'params[0]==401' Press Q or Ctrl+C to abort. Affect(class count: 3 , method count: 4) cost in 154 ms, listenerId: 3 ts=2022-07-31 11:12:25;thread_name=http-nio-61000-exec-10;id=19;is_daemon=true;priority=5;TCCL=org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedWebappClassLoader@34810d7e @org.apache.catalina.connector.Response.sendError() at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:462) at com.example.demo.arthas.AdminFilterConfig$AdminFilter.doFilter(AdminFilterConfig.java:38) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) ts=2022-07-31 11:12:25;thread_name=http-nio-61000-exec-10;id=19;is_daemon=true;priority=5;TCCL=org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedWebappClassLoader@34810d7e @org.apache.catalina.connector.ResponseFacade.sendError() at com.example.demo.arthas.AdminFilterConfig$AdminFilter.doFilter(AdminFilterConfig.java:38) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748)- 1
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案例: 排查HTTP请求返回404
在这个案例里，展示排查HTTP 404问题的技巧。
访问：
curl http://localhost:61000/a.txt结果是：
Something went wrong: 404 Not Found- 1
那么到底是哪个Servlet处理了这个请求，返回了404？
跟踪所有的Servlet函数
开始trace：trace javax.servlet.Servlet * > /tmp/servlet.txt- 1
访问：
curl http://localhost:61000/a.txt在Terminal 3里，查看/tmp/servlet.txt的内容：
less /tmp/servlet.txt- 1
/tmp/servlet.txt里的内容会比较多，需要耐心找到调用树里最长的地方。
可以发现请求最终是被freemarker处理的：
`---[13.974188ms] org.springframework.web.servlet.ViewResolver:resolveViewName(); +---[0.045561ms] javax.servlet.GenericServlet:<init>() +---[min=0.045545ms,max=0.074342ms,total=0.119887ms,count=2] org.springframework.web.servlet.view.freemarker.FreeMarkerView$GenericServletAdapter:<init>() +---[0.170895ms] javax.servlet.GenericServlet:init() | `---[0.068578ms] javax.servlet.GenericServlet:init() | `---[0.021793ms] javax.servlet.GenericServlet:init() `---[0.164035ms] javax.servlet.GenericServlet:getServletContext()- 1
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案例: 理解Spring Boot应用的ClassLoader结构
下面介绍classloader命令的功能。
先访问一个jsp网页，触发jsp的加载： 访问：
curl http://localhost:61000/helloshell@Alicloud:~$ curl http://localhost:61000/hello <html> <body> <h1>Hello World - jsp</h1> </body>- 1
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列出所有ClassLoader
classloader -l- 1
[arthas@1265]$ classloader -l name loadedCount hash parent BootstrapClassLoader 3610 null null com.taobao.arthas.agent.ArthasClassloader@650ca0b5 1702 650ca0b5 sun.misc.Launcher$ExtClassLoader@7 d0587f1 g.apache.jasper.servlet.JasperLoader@105e9f49 1 105e9f49 TomcatEmbeddedWebappClassLoader context: ROOT delegate: true ----------> Parent Classloader: org.springframework.boot.loader.La unchedURLClassLoader@19469ea2 0 34810d7e org.springframework.boot.loader.La unchedURLClassLoader@19469ea2 9ea2 org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 5336 19469ea2 sun.misc.Launcher$AppClassLoader@1 b6d3586 sun.misc.Launcher$AppClassLoader@1b6d3586 45 1b6d3586 sun.misc.Launcher$ExtClassLoader@7 d0587f1 sun.misc.Launcher$ExtClassLoader@7d0587f1 63 7d0587f1 null Affect(row-cnt:7) cost in 12 ms.- 1
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TomcatEmbeddedWebappClassLoader 加载的class数量是0，所以在spring boot embedded tomcat里，它只是一个空壳，所有的类加载都是LaunchedURLClassLoader完成的列出ClassLoader里加载的所有类
列出上面的
org.apache.jasper.servlet.JasperLoader加载的类：classloader -a --classLoaderClass org.apache.jasper.servlet.JasperLoader- 1
注：同ognl, 也可用-c 而不用–classLoaderClass指定
反编译jsp的代码
jad org.apache.jsp.jsp.hello_jsp- 1
[arthas@1919]$ jad org.apache.jsp.jsp.hello_jsp ClassLoader: +-org.apache.jasper.servlet.JasperLoader@34470234 r@19469ea2 +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2 +-sun.misc.Launcher$AppClassLoader@1b6d3586 +-sun.misc.Launcher$ExtClassLoader@7d0587f1- 1
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查看ClassLoader树
classloader -t- 1
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注意：请使用你的classLoaderHash值覆盖 ，然后手动执行下面相关命令：
列出ClassLoader的urls
比如上面查看到的spring LaunchedURLClassLoader的 hashcode是19469ea2，可以通过-c或者–classLoaderClass参数来列出它的所有urls：
classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader- 1
[arthas@1919]$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/classes!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-starter-aop-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-starter-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-autoconfigure-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-starter-logging-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/logback-classic-1.1.11.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/logback-core-1.1.11.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/jcl-over-slf4j-1.7.25.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/jul-to-slf4j-1.7.25.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/log4j-over-slf4j-1.7.25.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/snakeyaml-1.17.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-aop-4.3.17.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-beans-4.3.17.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/aspectjweaver-1.8.13.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/tomcat-embed-jasper-8.5.31.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/tomcat-embed-core-8.5.31.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/tomcat-annotations-api-8.5.31.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/tomcat-embed-el-8.5.31.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/ecj-3.12.3.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/jstl-1.2.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-starter-web-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-starter-tomcat-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/tomcat-embed-websocket-8.5.31.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/hibernate-validator-5.3.6.Final.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/validation-api-1.1.0.Final.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/jboss-logging-3.3.2.Final.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/classmate-1.3.4.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/jackson-databind-2.8.11.1.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/jackson-annotations-2.8.0.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/jackson-core-2.8.11.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-web-4.3.17.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-context-4.3.17.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-webmvc-4.3.17.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-expression-4.3.17.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-boot-starter-freemarker-1.5.13.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/freemarker-2.3.28.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-context-support-4.3.17.RELEASE.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/slf4j-api-1.7.25.jar!/ jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/lib/spring-core-4.3.17.RELEASE.jar!/ Affect(row-cnt:80) cost in 9 ms.- 1
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加载指定ClassLoader里的资源文件
查找指定的资源文件：
classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml[arthas@1919]$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader -r logback-spring.xml jar:file:/home/shell/demo-arthas-spring-boot.jar!/BOOT-INF/classes!/logback-spring.xml Affect(row-cnt:1) cost in 1 ms. [arthas@1919]$- 1
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尝试加载指定的类
比如用上面的spring LaunchedURLClassLoader 尝试加载 java.lang.String ：
classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String- 1
[arthas@1266]$ classloader --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --load java.lang.String load class success. class-info java.lang.String code-source name java.lang.String isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name String modifier final,public annotation interfaces java.io.Serializable,java.lang.Comparable,java.lang.CharSequence super-class +-java.lang.Object class-loader classLoaderHash null- 1
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案例：查找Top N线程
查看所有线程信息
thread- 1
[arthas@1266]$ thread Threads Total: 35, NEW: 0, RUNNABLE: 11, BLOCKED: 0, WAITING: 14, TIMED_WAITING: 5, TERMINATED: 0, Internal threads: 5 ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTE DAEMON 44 arthas-command-execute system 5 RUNNABLE 0.62 0.001 0:0.018 false true -1 VM Periodic Task Thread - -1 - 0.09 0.000 0:0.104 false true -1 VM Thread - -1 - 0.02 0.000 0:0.568 false true 2 Reference Handler system 10 WAITING 0.0 0.000 0:0.008 false true 3 Finalizer system 8 WAITING 0.0 0.000 0:0.014 false true 4 Signal Dispatcher system 9 RUNNABLE 0.0 0.000 0:0.000 false true 31 Attach Listener system 9 RUNNABLE 0.0 0.000 0:0.006 false true 33 arthas-timer system 9 WAITING 0.0 0.000 0:0.000 false true 36 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.025 false true 37 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true 38 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true 39 arthas-shell-server system 9 TIMED_WAI 0.0 0.000 0:0.000 false true 40 arthas-session-manager system 9 TIMED_WAI 0.0 0.000 0:0.000 false true 41 arthas-UserStat system 9 WAITING 0.0 0.000 0:0.000 false true 43 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.090 false true 13 ContainerBackgroundProcessor[S main 5 TIMED_WAI 0.0 0.000 0:0.002 false true 14 container-0 main 5 TIMED_WAI 0.0 0.000 0:0.000 false false 15 NioBlockingSelector.BlockPolle main 5 RUNNABLE 0.0 0.000 0:0.008 false true 16 http-nio-61000-exec-1 main 5 WAITING 0.0 0.000 0:0.000 false true 17 http-nio-61000-exec-2 main 5 WAITING 0.0 0.000 0:0.000 false true 18 http-nio-61000-exec-3 main 5 WAITING 0.0 0.000 0:0.000 false true 19 http-nio-61000-exec-4 main 5 WAITING 0.0 0.000 0:0.000 false true 20 http-nio-61000-exec-5 main 5 WAITING 0.0 0.000 0:0.000 false true 21 http-nio-61000-exec-6 main 5 WAITING 0.0 0.000 0:0.000 false true 22 http-nio-61000-exec-7 main 5 WAITING 0.0 0.000 0:0.000 false true 23 http-nio-61000-exec-8 main 5 WAITING 0.0 0.000 0:0.000 false true 24 http-nio-61000-exec-9 main 5 WAITING 0.0 0.000 0:0.000 false true 25 http-nio-61000-exec-10 main 5 WAITING 0.0 0.000 0:0.000 false true 26 http-nio-61000-ClientPoller-0 main 5 RUNNABLE 0.0 0.000 0:0.010 false true 27 http-nio-61000-Acceptor-0 main 5 RUNNABLE 0.0 0.000 0:0.000 false true 28 http-nio-61000-AsyncTimeout main 5 TIMED_WAI 0.0 0.000 0:0.008 false true 30 DestroyJavaVM main 5 RUNNABLE 0.0 0.000 0:3.208 false false -1 C1 CompilerThread1 - -1 - 0.0 0.000 0:1.615 false true -1 C2 CompilerThread0 - -1 - 0.0 0.000 0:6.116 false true -1 Service Thread - -1 - 0.0 0.000 0:0.000 false true- 1
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查看具体线程的栈
查看线程ID 16的栈：
thread 16- 1
[arthas@1266]$ thread 16 "http-nio-61000-exec-1" Id=16 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7df9709a at sun.misc.Unsafe.park(Native Method) - waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@7df9709a at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748)- 1
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查看CPU使用率top n线程的栈
thread -n 3- 1
"C1 CompilerThread1" [Internal] cpuUsage=2.25% deltaTime=4ms time=1644ms "arthas-command-execute" Id=44 cpuUsage=0.38% deltaTime=0ms time=32ms RUNNABLE at sun.management.ThreadImpl.dumpThreads0(Native Method) at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:461) at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:206) at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:122) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108) at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:385) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) "VM Periodic Task Thread" [Internal] cpuUsage=0.05% deltaTime=0ms time=156ms- 1
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查看5秒内的CPU使用率top n线程栈
thread -n 3 -i 5000- 1
[arthas@1266]$ thread -n 3 -i 5000 "VM Periodic Task Thread" [Internal] cpuUsage=0.07% deltaTime=3ms time=183ms "C1 CompilerThread1" [Internal] cpuUsage=0.06% deltaTime=2ms time=1650ms "arthas-command-execute" Id=44 cpuUsage=0.01% deltaTime=0ms time=36ms RUNNABLE at sun.management.ThreadImpl.dumpThreads0(Native Method) at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:461) at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:206) at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:122) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108) at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:385) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)- 1
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查找线程是否有阻塞
thread -b- 1
[arthas@1266]$ thread -b No most blocking thread found!- 1
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Web Console
Arthas支持通过Web Socket来连接。
本地体验
当在本地启动时，可以访问 http://127.0.0.1:8563/ ，通过浏览器来使用Arthas。
推荐通过“快速入门”来体验： https://arthas.aliyun.com/doc/quick-start.html
Exit/Stop
reset
Arthas在 watch/trace 等命令时，实际上是修改了应用的字节码，插入增强的代码。显式执行 reset 命令，可以清除掉这些增强代码。
reset- 1
[arthas@1266]$ reset Affect(class count: 0 , method count: 0) cost in 1 ms, listenerId: 0- 1
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退出Arthas
用 exit 或者 quit 命令可以退出Arthas。
exit- 1
Ctrl+C退出Arthas之后，还可以再次用 java -jar arthas-boot.jar 来连接。
java -jar arthas-boot.jar- 1
彻底退出Arthas
exit/quit命令只是退出当前session，arthas server还在目标进程中运行。
想完全退出Arthas，可以执行 stop 命令。
stop- 1
arthas-boot支持的参数
arthas-boot.jar 支持很多参数，可以执行
java -jar arthas-boot.jar -h来查看。java -jar arthas-boot.jar -h- 1
允许外部访问
默认情况下， arthas server侦听的是 127.0.0.1 这个IP，如果希望远程可以访问，可以使用–target-ip的参数。
java -jar arthas-boot.jar --target-ip- 1
列出所有的版本
java -jar arthas-boot.jar --versions- 1
使用指定版本：
java -jar arthas-boot.jar --use-version 3.1.0- 1
只侦听Telnet端口，不侦听HTTP端口
java -jar arthas-boot.jar --telnet-port 9999 --http-port -1- 1
打印运行的详情
java -jar arthas-boot.jar -v- 1
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- 原文地址：https://blog.csdn.net/weixin_45847167/article/details/126095278
