https://issues.apache.org/bugzilla/show_bug.cgi?id=57546
Bug ID: 57546
Summary: Memory Leak in SecureNioChannel
Product: Tomcat 8
Version: 8.0.18
Hardware: PC
OS: Windows NT
Status: NEW
Severity: major
Priority: P2
Component: WebSocket
Assignee: dev@tomcat.apache.org
Reporter: paul.gay...@gmail.com
Created attachment 32440
--> https://issues.apache.org/bugzilla/attachment.cgi?id=32440&action=edit
Too many instances in hashmap
We are connecting mobile devices via websocket to Tomcat 8.0.18 server. The
physical mobile connection can die at random times. When the connection goes
down the instance of org.apache.coyote.http11.upgrade.NioProcessor is not
removed from the connections HashMap in class
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler. There are
4,181 entries in the connections HashMap. However, there are in fact 1,400 real
socket connections. See DumpHprof1.jpg. This displays a drill-down into one of
the HashMap entries. The instance of SafeCommConnection is my ServerEndpoint
POJO. When onClose is called in my ServerEndpoint I set a flag called isClosing
to true. You can see on the right side that it is set to true so I have removed
it from my app but the instance remains in memory held by the NioProtocol's
connections HashMap. It seems that http11NioProtocol.release method is not
getting called. Also, here is a stack trace in the stderr log file. It gets
hundreds of these:
06-Feb-2015 14:12:05.255 INFO [http-nio-443-exec-385]
org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doClose Failed to
close the ServletOutputStream connection cleanly
java.io.IOException: An existing connection was forcibly closed by the remote
host
at sun.nio.ch.SocketDispatcher.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(Unknown Source)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
at sun.nio.ch.IOUtil.write(Unknown Source)
at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
at
org.apache.tomcat.util.net.SecureNioChannel.flush(SecureNioChannel.java:134)
at
org.apache.tomcat.util.net.SecureNioChannel.close(SecureNioChannel.java:370)
at
org.apache.tomcat.util.net.SecureNioChannel.close(SecureNioChannel.java:398)
at
org.apache.coyote.http11.upgrade.NioServletOutputStream.doClose(NioServletOutputStream.java:138)
at
org.apache.coyote.http11.upgrade.AbstractServletOutputStream.close(AbstractServletOutputStream.java:137)
at
org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doClose(WsRemoteEndpointImplServer.java:143)
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.close(WsRemoteEndpointImplBase.java:638)
at
org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(WsRemoteEndpointImplServer.java:118)
at
org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(WsRemoteEndpointImplServer.java:81)
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:450)
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:338)
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:270)
at
org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:563)
at org.apache.tomcat.websocket.WsSession.onClose(WsSession.java:503)
at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.close(WsHttpUpgradeHandler.java:183)
at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.access$200(WsHttpUpgradeHandler.java:48)
at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:214)
at
org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:194)
at
org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:96)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
at
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
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