Exception in thread "Thread-5" java.lang.NoSuchMethodError: io.netty.util.concurrent.SingleThreadEventExecutor异常处理

异常
Exception in thread "Thread-5" java.lang.NoSuchMethodError: io.netty.util.concurrent.SingleThreadEventExecutor.(Lio/netty/util/concurrent/EventExecutorGroup;Ljava/util/concurrent/Executor;ZLjava/util/Queue;Lio/netty/util/concurrent/RejectedExecutionHandler;)V
at io.netty.channel.SingleThreadEventLoop.(SingleThreadEventLoop.java:65)
at io.netty.channel.nio.NioEventLoop.(NioEventLoop.java:138)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:146)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:37)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.(MultithreadEventExecutorGroup.java:84)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.(MultithreadEventExecutorGroup.java:58)
at io.netty.channel.MultithreadEventLoopGroup.(MultithreadEventLoopGroup.java:52)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:96)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:91)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:72)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:52)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:44)
at com.diesheng.wehat.websocket.NettyServer.startServer(NettyServer.java:39)
at com.diesheng.wehat.websocket.NettyServer.access$000(NettyServer.java:22)
at com.diesheng.wehat.websocket.NettyServer$2.run(NettyServer.java:77)
at java.lang.Thread.run(Thread.java:748)

由于单独引用netty版本 在tomcat启动时 出现以上的异常信息 经过搜索 了解问题如下
由于io.lettuce:lettuce-core:jar:5.1.7.RELEASE中引用了其他版本的netty 导致了netty 启动冲突

解决方案



org.springframework.boot
spring-boot-starter-data-redis


io.netty
netty-common


io.netty
netty-handler


io.netty
netty-transport

  再次 使用mvn dependency:tree 查看maven 树
  ![](https://img2020.cnblogs.com/blog/883541/202005/883541-20200519094852830-1835802717.png)