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From bugzi...@apache.org
Subject [Bug 54746] New: Cannot obtain information from Session in onClose method
Date Sun, 24 Mar 2013 01:37:16 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=54746

            Bug ID: 54746
           Summary: Cannot obtain information from Session in onClose
                    method
           Product: Tomcat 8
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: nicholas@nicholaswilliams.net
    Classification: Unclassified

See the exception below. I attempted to call getUserProperties() in a method
annotated @OnClose. Here is what the WebSocket spec says about this:

[quote]Once the session is closed, it is no longer valid for use by
applications. Calling any of its methods (with the exception of the close()
methods) once the session has been closed will result in an {@link
java.lang.IllegalStateException} being thrown. Developers should retrieve any
information from the session during the {@link Endpoint#onClose }
method.[/quote]

This clearly indicates that it is valid to "retrieve any information from the
session" DURING the call to onClose. Therefore, this exception should not have
been thrown.

SEVERE: Failed to call onError method of POJO end point for POJO of type
[com.wrox.chat.ChatEndpoint]
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:487)
    at
org.apache.tomcat.websocket.pojo.PojoEndpointBase.onError(PojoEndpointBase.java:127)
    at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.onError(WsHttpUpgradeHandler.java:139)
    at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.access$300(WsHttpUpgradeHandler.java:42)
    at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onError(WsHttpUpgradeHandler.java:197)
    at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:183)
    at
org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:169)
    at
org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:94)
    at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:618)
    at
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1581)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1537)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IllegalStateException: The WebSocket session has been
closed and no method (apart from close()) may be called on a closed session
    at org.apache.tomcat.websocket.WsSession.checkState(WsSession.java:504)
    at
org.apache.tomcat.websocket.WsSession.getUserProperties(WsSession.java:455)
    at com.wrox.chat.ChatEndpoint.onError(ChatEndpoint.java:154)
    ... 18 more

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