idea找不到或无法加载主类-白红宇

浪费了我好长时间查找错误源头，百度终无果，最终解决办法：

1.Mark Directory as 给予scala一个Source root（变成蓝色的） 2.修改pom.xml配置文件

    
        
     
      4.0.0
         
     
      com.etc
         
     
      spark-sql
         
     
      1.0-SNAPSHOT
         
             
      
       2.10.6
              
      
       UTF-8
          
         
             
              
                
       
        org.scala-lang
                 
       
        scala-library
                 
       
        ${scala.version}
             
            
                
       
        junit
                 
       
        junit
                 
       
        3.8.1
                 
       
        test
             
            
                
       
        org.apache.spark
                 
       
        spark-core_2.10
                 
       
        1.5.1
             
            
                
       
        org.apache.spark
                 
       
        spark-sql_2.10
                 
       
        1.5.1
             
            
                
       
        org.apache.spark
                 
       
        spark-hive_2.10
                 
       
        1.5.1
             
            
                
       
        org.apache.spark
                 
       
        spark-streaming_2.10
                 
       
        1.5.1
             
            
                
       
        org.apache.hadoop
                 
       
        hadoop-client
                 
       
        2.4.1
             
            
                
       
        org.apache.spark
                 
       
        spark-streaming-kafka_2.10
                 
       
        1.5.1
             
            
                
       
        org.apache.spark
                 
       
        spark-streaming-flume_2.10
                 
       
        1.5.1
             
            
                
       
        mysql
                 
       
        mysql-connector-java
                 
       
        8.0.11
             
            
                
       
        org.apache.hive
                 
       
        hive-jdbc
                 
       
        0.13.0
             
            
                
       
        org.apache.httpcomponents
                 
       
        httpclient
                 
       
        4.4.1
             
            
                
       
        org.apache.httpcomponents
                 
       
        httpcore
                 
       
        4.4.1
             
          
         
           
      
       src/main/java
            
      
       src/main/
            
              
               
        
         maven-assembly-plugin
                
                    
          
          
           jar-with-dependencies
           
                     
          
           
            
           
                 
                
                    
          
          
           make-assembly
           
          
           package
           
           
           
            single
            
           
                 
            
           
               
        
         org.codehaus.mojo
                
        
         exec-maven-plugin
                
        
         1.2.1
                
                    
          
           
           
            exec
            
           
                 
                
                    
         
          java
                     
         
          true
                     
         
          false
                     
         
          compile
                     
         
          cn.spark.study.App
                 
            
           
               
        
         org.apache.maven.plugins
                
        
         maven-compiler-plugin
                
                    
         1.6            
         
          1.6
                 
            
           
               
                 
        
         net.alchim31.maven
                  
        
         scala-maven-plugin
                  
        
         3.2.2
                  
                      
          
           
           
            compile
            
           
            testCompile
            
           
           
            
            
             
            
             -dependencyfile
             
            
             ${project.build.directory}/.scala_dependencies
             
            
           
                     
                
               
               
                   
        
         org.apache.maven.plugins
                    
        
         maven-shade-plugin
                    
        
         2.4.3
                    
                 
          
          
           package
           
           
           
            shade
            
           
           
            
             
             
              *:*
              
              
              
               META-INF/*.SF
               
              
               META-INF/*.DSA
               
              
               META-INF/*.RSA
               
              
             
            
            
             
             
              reference.conf
              
             
             
             
              cn.itcast.rpc.Master
              
              
             
            
           /execution> 
         
                
               
          
     
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