spark程序执行报io.netty.util.concurrent.SingleThreadEventExecutor.＜init＞

io.netty.util.concurrent.SingleThreadEventExecutor.(Lio/netty/util/concurrent/EventExecutorGroup;Ljava/util/concurrent/Executor;ZLjava/util/Queue;Lio/netty/util/concurrent/RejectedExecutionHandler;)V

netty版本冲突，我们在idea的Terminal执行  mvn dependency:tree

然后在结果中搜索有冲突的io.netty，确定是那些引用后，我们修改pom文件相应引用的依赖配置，排除即可

    
            
                
                    com.google.code.gson
                    gson
                
                
                    org.jboss.netty
                    netty
                
                
                    io.netty
                    netty
                
                
                    io.netty
                    netty-all
                
            
            org.apache.spark
            spark-sql_2.12
            ${spark.version}