Netty服务端启动正常，当时无法连接

最新推荐文章于 2024-01-05 09:25:13 发布

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最新推荐文章于 2024-01-05 09:25:13 发布 · 1.3w 阅读

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本文分析了Netty服务端启动正常但客户端连接时出现“Connection refused”错误的原因，并通过对比测试定位问题。最终发现未正确处理channel关闭同步是导致异常的关键。

服务端启动正常，客户端连接时报如下错误：

Exception in thread "main" io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: /127.0.0.1:6668
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
	at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:325)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:886)
	at io.netty.util.concurrent.FastThreadLocalR