java - EOFException 总是由远程主机引起吗？

Question

我有一个通过套接字向主机发送数据的客户端。有时我会得到java.io.EOFException。

问题是:我如何知道是谁导致套接字关闭？由于远程主机关闭了套接字，该异常是否总是引发？

或者也可能是内部网络连接问题？或者来 self 的 ISP？

org.springframework.messaging.MessagingException: Dispatcher failed to deliver Message; nested exception is org.springframework.messaging.MessagingException: Exception while awaiting reply; nested exception is java.io.EOFException: Connection is closed
    at org.springframework.integration.dispatcher.AbstractDispatcher.wrapExceptionIfNecessary(AbstractDispatcher.java:133) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:120) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:121) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:89) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:423) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:373) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) ~[spring-messaging-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:150) ~[spring-messaging-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:45) ~[spring-messaging-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.messaging.core.AbstractMessagingTemplate.sendAndReceive(AbstractMessagingTemplate.java:42) ~[spring-messaging-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:97) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:38) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.messaging.core.AbstractMessagingTemplate.sendAndReceive(AbstractMessagingTemplate.java:37) ~[spring-messaging-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_131]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_131]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_131]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]

Caused by: org.springframework.messaging.MessagingException: Exception while awaiting reply; nested exception is java.io.EOFException: Connection is closed
    at org.springframework.integration.ip.tcp.TcpOutboundGateway$AsyncReply.getReply(TcpOutboundGateway.java:322) ~[spring-integration-ip-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.ip.tcp.TcpOutboundGateway.handleRequestMessage(TcpOutboundGateway.java:139) ~[spring-integration-ip-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler$AdvisedRequestHandler.handleRequestMessage(AbstractReplyProducingMessageHandler.java:178) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at sun.reflect.GeneratedMethodAccessor980.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) ~[spring-aop-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.integration.handler.advice.AbstractRequestHandlerAdvice$1.execute(AbstractRequestHandlerAdvice.java:75) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.handler.advice.AbstractRequestHandlerAdvice.invoke(AbstractRequestHandlerAdvice.java:70) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at com.sun.proxy.$Proxy1241.handleRequestMessage(Unknown Source) ~[?:?]
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.doInvokeAdvisedRequestHandler(AbstractReplyProducingMessageHandler.java:127) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:112) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116) ~[spring-integration-core-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    ... 21 more

Caused by: java.io.EOFException: Connection is closed
    at org.springframework.integration.ip.tcp.connection.AbstractConnectionFactory$1.run(AbstractConnectionFactory.java:682) ~[spring-integration-ip-4.3.11.RELEASE.jar:4.3.11.RELEASE]
    ... 3 more

Answer 1

The question is: how can I know who caused the socket close? Is that exception always raised because the remote host closed the connection?

是的。任何其他情况都应该导致连接重置或读取超时，这就是 JRE 类本身的行为方式。

但是，错误消息的措辞并不令人鼓舞。 “连接已关闭”可能意味着您使用的库在使用已被本地应用程序关闭的连接时错误地抛出 EOFException。您需要查看源代码才能确定。