eclipse新建maven项目：'Building' has encountered a problem. Errors occurred during the build.

一、eclipse 新建maven 项目报错(因为没有配置maven环境)

1、问题：

① 出现的问题1：

Could not calculate build plan:Plugin
org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

② 出现的问题2：

'Building' has encountered a problem. Errors occurred during the build.

2、分析问题：

① 错误原因：编译工具eclipse没有配置 maven的环境

3、解决：在eclipse中配置maven的环境

##### 3-1、又出现bug：

• 报错信息如下：

Description	Resource	Path	Location	Type
CoreException: Could not get the value for parameter compilerId for plugin execution default-compile: PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:3.1 or one of its dependencies could not be resolved: Failed to collect dependencies at org.apache.maven.plugins:maven-compiler-plugin:jar:3.1 -> org.apache.maven.shared:maven-shared-incremental:jar:1.1 -> org.apache.maven:maven-core:jar:2.2.1 -> org.apache.maven:maven-profile:jar:2.2.1: ArtifactDescriptorException: Failed to read artifact descriptor for org.apache.maven:maven-profile:jar:2.2.1: ArtifactResolutionException: org.apache.maven:maven-profile:pom:2.2.1 failed to transfer from http://maven.aliyun.com/nexus/content/groups/public during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of nexus-aliyun has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven:maven-profile:pom:2.2.1 from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): The operation was cancelled.	pom.xml	/ssm-xml-demo	line 6	Maven Project Build Lifecycle Mapping Problem

3-1、解决：在eclipse中强制更新maven的项目：快捷键 alt+f5，然后勾选 Force Update of Snapshots/Releases

二、补充一下 maven的环境搭建

Maven 环境搭建

一、准备工作：

1、maven下载：官网：https://maven.apache.org/download.cgi

• 下载完成后解压出来

2、配置环境变量：

• 细节：为什么要单独配置一个M2_HOME 的变量：方便后续学习

  • 后续使用的自动依赖的系统，比如SpringBoot、SpringCloud,它会引用M2_HOME 这个地址。

■ 添加系统变量：

□ M2_HOME maven目录下的bin目录

□ MAVEN_HOME maven的目录

□ 在系统的path中配置 %MAVEN_HOME%\bin

■ 验证maven是否配置成功：查看maven版本的命令 mvn -version

3、修改maven 配置文件的镜像为 阿里云镜像

• 配置文件位置：maven根目录/conf/settings.xml 找到镜像元素mirrors

• 镜像：mirrors：

  • 作用：加速下载
  • 默认是使用国外的镜像，国内建议使用阿里云镜像加速下载

     <!-- 添加之前，先把原来的镜像全注释掉 -->
    <!-- 配置方式1 -->
     <mirror>
          <id>nexus-aliyun</id>
  　　　　 <mirrorOf>*,!jeecg,!jeecg-snapshots</mirrorOf>
          <name>Nexus aliyun</name>
          <url>http://maven.aliyun.com/nexus/content/groups/public</url>
      </mirror>
  

  <!-- 配置方式2 -->
	<mirror>
        <id>nexus-aliyun</id>
　　　　 <mirrorOf>central</mirrorOf>
        <name>Nexus aliyun</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public</url>
    </mirror>

4、修改maven 配置文件的本地仓库位置

• 修改本地仓库位置为：maven 根目录下 自己手动建立的 maven-repo
• 配置文件位置：maven根目录/conf/settings.xml 找到 localRepository元素

  <localRepository>E:\environment\mavenEvironment\apache-maven-3.8.2\maven-repo</localRepository>