Netty5：Maven编译打包JAR时，Netty4误入导致数据读取报错

昨天下午碰到这个问题，百度，google都不好使，能用的资料太少，在此记录下。 同时也给遇到相同问题的朋友一些参考。

14:31:18.336 [nioEventLoopGroup-1-0] WARN  io.netty.channel.nio.NioEventLoop.warn:151 - Unexpected exception in the selector loop. 
java.lang.AbstractMethodError: io.netty.buffer.SimpleLeakAwareByteBuf.touch(Ljava/lang/Object;)Lio/netty/util/ReferenceCounted;
        at io.netty.util.ReferenceCountUtil.touch(ReferenceCountUtil.java:73)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:387)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:956)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:80)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:158)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:514)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:471)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:385)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:351)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
        at io.netty.util.internal.chmv8.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1412)
        at io.netty.util.internal.chmv8.ForkJoinTask.doExec(ForkJoinTask.java:280)
        at io.netty.util.internal.chmv8.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:877)
        at io.netty.util.internal.chmv8.ForkJoinPool.scan(ForkJoinPool.java:1706)
        at io.netty.util.internal.chmv8.ForkJoinPool.runWorker(ForkJoinPool.java:1661)
        at io.netty.util.internal.chmv8.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:126)

以上是报错信息，原因在于Netty4传递到touch(hint)对象类型为ReferenceCounted，与Netty5传递的Object对象不一样所导致的类型错误，本次出现使用的是Netty5，但是maven编译打包的时候，由于pom中管理的Zookeeper与Feign包引用了Netty4的依赖(可在maven项目结构视图中看到)，才造成Netty4的误入。 解决方式为在Zookeeper和Feign包下分别注明对应引用的为rxnetty并重新编译即可

          
                io.reactivex
                rxnetty
          
  

转载于:https://my.oschina.net/JQWang/blog/755929