netty 服务器空闲一段时候后会自动断开链接如何处理

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netty 服务器空闲一段时候后会自动断开链接如何处理0

大伙有没有出现过这样的问题。用netty做集群服务器，包括客户端（clientBootstrap）和服务端（serverBootstrap），系统空闲3个多小时候，客户端与服务端的链接会自动断开（“远程主机强迫关闭了一个现有的连接”），系统重新后连接报异常：

01:10:31,244  WARN SingleThreadEventExecutor,nioEventLoopGroup-2-4:356 - A task raised an exception.
java.lang.IllegalArgumentException: promise already done: DefaultChannelPromise@2038329b(failure(java.util.concurrent.CancellationException)
	at io.netty.channel.DefaultChannelHandlerContext.validatePromise(DefaultChannelHandlerContext.java:806)
	at io.netty.channel.DefaultChannelHandlerContext.connect(DefaultChannelHandlerContext.java:477)
	at io.netty.channel.DefaultChannelHandlerContext.connect(DefaultChannelHandlerContext.java:467)
	at io.netty.channel.DefaultChannelPipeline.connect(DefaultChannelPipeline.java:847)
	at io.netty.channel.AbstractChannel.connect(AbstractChannel.java:199)
	at io.netty.bootstrap.Bootstrap$2.run(Bootstrap.java:165)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:353)
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
	at java.lang.Thread.run(Unknown Source)

Caused by: java.net.NoRouteToHostException: No route to host: no further information
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at sun.nio.ch.SocketChannelImpl.finishConnect(Unknown Source)
	at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:191)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:279)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:461)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:378)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:350)
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)

请问这个问题如何解决，我有做心跳处理，客户端每个几秒会请求服务端，这样都还会自动断开链接，好郁闷....