mm_ Unexpected exception in the selector loop

问题描述：项目请求，无响应

Unexpected exception in the selector loop

 org.jboss.netty.channel.socket.nio.AbstractNioSelector
警告: Unexpected exception in the selector loop.
java.lang.NoClassDefFoundError: org/jboss/netty/util/internal/ByteBufferUtil
    at org.jboss.netty.channel.socket.nio.SocketReceiveBufferAllocator.newBuffer(SocketReceiveBufferAllocator.java:62)
    at org.jboss.netty.channel.socket.nio.SocketReceiveBufferAllocator.get(SocketReceiveBufferAllocator.java:48)
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:62)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
    at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
    at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
    at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

问题原因：

I think you shutdown EventLoopGroup before all requests are handled. Be sure to use EventLoopGroup.shutdownGracefully().
If you shutdown the EventLoopGroup before everything is handled it will produce such an error

https://stackoverflow.com/questions/17362839/netty4-unexpected-exception-in-the-selector-loop

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