hi, The scenario involves a mobile phone switching from wifi to (unstable) mobile network. The phone looses the connection but the server doesn't seem aware. Basically the server tries to send a message and blocks the thread on which this is done. From the logs it seems to take about 15 minutes before a "java.net.SocketException: Broken pipe" finally occurs.
Is this expected behavior or an issue? I've seen the websocket-how-to on setting BLOCKING_SEND_TIMEOUT. However I would have expected a timeout based on the default value of 20 seconds. Also it says the property is configurable through the WebSocketSession but for something like this I would expect a global setting. Is there such a way to do that? The issue was originally reported here [1]. It's a long thread and might not add to much more. It's worth pointing out the issue seems to be reproducible with even 1 phone. Also it could not be reproduced on a windows server with the same tomcat7 server (7.0.52). Here is the stack of the the writing thread: - java.net.SocketOutputStream.socketWrite0(java.io.FileDescriptor, byte[], int, int) @bci=0 (Compiled frame; information may be imprecise) - java.net.SocketOutputStream.socketWrite(byte[], int, int) @bci=52, line=113 (Compiled frame) - java.net.SocketOutputStream.write(byte[], int, int) @bci=4, line=159 (Compiled frame) - org.apache.coyote.http11.upgrade.BioServletOutputStream.doWrite(boolean, byte[], int, int) @bci=8, line=37 (Compiled frame) - org.apache.coyote.http11.upgrade.AbstractServletOutputStream.writeInternal(byte[], int, int) @bci=24, line=125 (Compiled frame) - org.apache.coyote.http11.upgrade.AbstractServletOutputStream.write(byte[], int, int) @bci=16, line=92 (Compiled frame) - org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(boolean) @bci=68, line=94 (Compiled frame) - org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(javax.websocket.SendHandler, java.nio.ByteBuffer[]) @bci=12, line=81 (Compiled frame) - org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(org.apache.tomcat.websocket.WsRemoteEndpointImplBase$MessagePart) @bci=349, line=378 (Compiled frame) - org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(byte, java.nio.ByteBuffer, boolean, javax.websocket.SendHandler) @bci=99, line=279 (Compiled frame) - org.apache.tomcat.websocket.WsRemoteEndpointImplBase$TextMessageSendHandler.write() @bci=97, line=672 (Interpreted frame) - org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendPartialString(java.nio.CharBuffer, boolean) @bci=43, line=210 (Interpreted frame) - org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendPartialString(java.lang.String, boolean) @bci=13, line=185 (Interpreted frame) - org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendText(java.lang.String, boolean) @bci=6, line=49 (Compiled frame) Rossen
