netty报错Force-closing a channel whose registration task was not accepted by an event loop处理办法

使用netty搭建机器间通信客户端时，报了如下错误

08-21 17:27:55 [ WARN] [http-nio-8081-exec-379] Force-closing a channel whose registration task was not accepted by an event loop: [id: 0x2e20a0eb]
java.util.concurrent.RejectedExecutionException: event executor terminatedat io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:855)at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:340)at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:333)at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:766)at io.netty.channel.AbstractChannel$AbstractUnsafe.register(AbstractChannel.java:472)at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:87)at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:81)at io.netty.channel.MultithreadEventLoopGroup.register(MultithreadEventLoopGroup.java:86)at io.netty.bootstrap.AbstractBootstrap.initAndRegister(AbstractBootstrap.java:322)at io.netty.bootstrap.Bootstrap.doResolveAndConnect(Bootstrap.java:159)at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:143)at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:127)

原因：eventloop实现的线程池被关闭了，导致channel向eventloop注册，向SingleThreadEventExecutor添加task时被拒绝了。

解决办法：谨慎使用 group.shutdownGracefully();，在确保连接不再使用时，再shutdown

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netty报错Force-closing a channel whose registration task was not accepted by an event loop处理办法

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