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https://issues.apache.org/jira/browse/WICKET-6818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17183276#comment-17183276
]
ASF subversion and git services commented on WICKET-6818:
---------------------------------------------------------
Commit 4eb6a72a842670216aa1ee7f411dfd1a70bea06c in wicket's branch
refs/heads/wicket-8.x from Martin Tzvetanov Grigorov
[ https://gitbox.apache.org/repos/asf?p=wicket.git;h=4eb6a72 ]
WICKET-6818 NullPointerException in WicketEndpoint onClose
(cherry picked from commit 3b4c6058a51d564f8f0510c01408a9311f20d47d)
> NPE in WicketEndpoint onClose
> -----------------------------
>
> Key: WICKET-6818
> URL: https://issues.apache.org/jira/browse/WICKET-6818
> Project: Wicket
> Issue Type: Bug
> Affects Versions: 8.7.0, 8.9.0
> Reporter: Joshua
> Assignee: Martin Tzvetanov Grigorov
> Priority: Major
> Attachments: image-2020-08-21-09-13-13-799.png
>
>
> NPE can occasionally occur inside WicketEndpoint. In our system we have a
> intermediary page for logging out. Meaning we go from home -> logout -> login
> page. These transitions are very quick and have occasionally hit this NPE.
> Expected behavior do not throw a NPE when page is transitioning and an onOpen
> call has not been made yet. And do not throw a NPE when onClose is called
> before onOpen.
> Possible solution:
> check for null javaxWebSocketProcessor
> !image-2020-08-21-09-13-13-799.png!
> {code:java}
> WicketEndpoint:99 - An error occurred in web socket connection with id :
> 5ajava.lang.NullPointerException at
> org.apache.wicket.protocol.ws.javax.WicketEndpoint.onClose(WicketEndpoint.java:86)
> at
> org.apache.tomcat.websocket.WsSession.fireEndpointOnClose(WsSession.java:555)
> at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:501) at
> org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:459) at
> org.apache.tomcat.websocket.WsSession.close(WsSession.java:446) at
> org.apache.wicket.protocol.ws.javax.JavaxWebSocketConnection.close(JavaxWebSocketConnection.java:68)
> ****************************OUR PAGE CALLS CLOSE******************* at
> org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:598)
> at
> org.apache.wicket.core.request.handler.ListenerRequestHandler.internalInvoke(ListenerRequestHandler.java:306)
> at
> org.apache.wicket.core.request.handler.ListenerRequestHandler.invoke(ListenerRequestHandler.java:280)
> at
> org.apache.wicket.core.request.handler.ListenerRequestHandler.invokeListener(ListenerRequestHandler.java:222)
> at
> org.apache.wicket.core.request.handler.ListenerRequestHandler.respond(ListenerRequestHandler.java:208)
> at
> org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:914)
> at
> org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:65)
> at
> org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:282)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:253)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:221)
> at
> org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:275)
> at
> org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:206)
> at
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:299)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
> at
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
> at
> org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
> at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
> at
> org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
> at
> org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
> at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
> at
> org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
> at
> {code}
>
>
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