Dear Tomcat developers:
We are using Tomcat 8.0.32 on SSL with WebSocket. We found a lot of IOException in our catalina.out file. It looks like this: 17-Feb-2016 03:24:16.415 INFO [http-nio-8443-exec-5] org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doClose Failed to close the ServletOutputStream connection cleanly java.io.IOException: Broken pipe at sun.nio.ch.FileDispatcherImpl.write0(Native Method) at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93) at sun.nio.ch.IOUtil.write(IOUtil.java:51) at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471) at org.apache.tomcat.util.net.SecureNioChannel.flush(SecureNioChannel.java:140) at org.apache.tomcat.util.net.SecureNioChannel.close(SecureNioChannel.java:385) at org.apache.tomcat.util.net.SecureNioChannel.close(SecureNioChannel.java:413) at org.apache.coyote.http11.upgrade.NioServletOutputStream.doClose(NioServletOutputStream.java:138) at org.apache.coyote.http11.upgrade.AbstractServletOutputStream.close(AbstractServletOutputStream.java:140) at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doClose(WsRemoteEndpointImplServer.java:143) at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.close(WsRemoteEndpointImplBase.java:663) at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:594) at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:488) at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.onError(WsHttpUpgradeHandler.java:150) at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.access$300(WsHttpUpgradeHandler.java:48) at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsWriteListener.onError(WsHttpUpgradeHandler.java:238) at org.apache.coyote.http11.upgrade.AbstractServletOutputStream.onError(AbstractServletOutputStream.java:239) at org.apache.coyote.http11.upgrade.AbstractServletOutputStream.onWritePossible(AbstractServletOutputStream.java:200) at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:98) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:647) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1452) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) More information: OS Name: Linux OS Version: 3.14.35-28.38.amzn1.x86_64 JVM Version: 1.8.0_71-b15 JVM Vendor: Oracle Corporation Based on our test, it is happened when users use mobile phone to open WebSocket, then cut off the WiFi (e.g. open airplane mode). After that, the server doesn't know the connection has fail. This Exception only happened when we use SSL. If we change wss to ws, the issue doesn't occur. Is it a bug of Tomcat 8? Should you fix this problem in the future? Cheers, Robert Li 2016/2/17
