flink web-ui提交New Job报错Server Response Message: Internal server error.

报错:在flink web-ui提交New Job报错Server Response Message: Internal server error.

查看日志

Caused by: org.apache.flink.client.program.ProgramInvocationException: The program's entry point class 'WordCountScalaStream' was not found in the jar file.
        at org.apache.flink.client.program.PackagedProgram.loadMainClass(PackagedProgram.java:389) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.client.program.PackagedProgram.(PackagedProgram.java:139) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.client.program.PackagedProgram.(PackagedProgram.java:61) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.client.program.PackagedProgram$Builder.build(PackagedProgram.java:557) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.runtime.webmonitor.handlers.utils.JarHandlerUtils$JarHandlerContext.toPackagedProgram(JarHandlerUtils.java:156) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        ... 50 more
Caused by: java.lang.ClassNotFoundException: WordCountScalaStream
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_231]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_231]
        at org.apache.flink.util.FlinkUserCodeClassLoader.loadClassWithoutExceptionHandling(FlinkUserCodeClassLoader.java:61) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.util.ChildFirstClassLoader.loadClassWithoutExceptionHandling(ChildFirstClassLoader.java:74) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.util.FlinkUserCodeClassLoader.loadClass(FlinkUserCodeClassLoader.java:48) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_231]
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_231]
        at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_231]
        at org.apache.flink.client.program.PackagedProgram.loadMainClass(PackagedProgram.java:387) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.client.program.PackagedProgram.(PackagedProgram.java:139) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.client.program.PackagedProgram.(PackagedProgram.java:61) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.client.program.PackagedProgram$Builder.build(PackagedProgram.java:557) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        at org.apache.flink.runtime.webmonitor.handlers.utils.JarHandlerUtils$JarHandlerContext.toPackagedProgram(JarHandlerUtils.java:156) ~[flink-dist_2.12-1.11.1.jar:1.11.1]
        ... 50 more
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原因：maven打包时未打包scala程序

解决方案：在pom.xml加入maven-scala-plugin打包插件

        
            
            
                org.apache.maven.plugins
                maven-shade-plugin
                2.4.3
                
                    
                        package
                        
                            shade
                        
                        
                            
                                
                                    *:*
                                    
                                        META-INF/*.SF
                                        META-INF/*.DSA
                                        META-INF/*.RSA
                                    
                                
                            
                        
                    
                
            
            
                org.scala-tools
                maven-scala-plugin
                2.12.2
                
                    
                        
                            compile
                            testCompile
                        
                    
                
            
        
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重新打包，然后上传到flink的web-ui，问题解决