[jira] [Resolved] (WICKET-4965) NPE when stopping Tomcat

["Emond Papegaaij (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-4965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Emond Papegaaij resolved WICKET-4965.
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 6.5.0

Resources are no longer unregistered during shutdown now, preventing the NPE (which also occurs on Jetty by the way).
                
> NPE when stopping Tomcat
> ------------------------
>
>                 Key: WICKET-4965
>                 URL: https://issues.apache.org/jira/browse/WICKET-4965
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket-atmosphere
>         Environment: Atmosphere 1.0.5, wicket-atmosphere 0.5
>            Reporter: Andrei Badea
>            Assignee: Emond Papegaaij
>             Fix For: 6.5.0
>
>
> {noformat}
> java.lang.NullPointerException: null
>     at org.apache.wicket.atmosphere.EventBus.get(EventBus.java:86)
>     at org.apache.wicket.atmosphere.AtmosphereBehavior.findEventBus(AtmosphereBehavior.java:85)
>     at org.apache.wicket.atmosphere.AtmosphereBehavior.onDisconnect(AtmosphereBehavior.java:182)
>     at org.atmosphere.cpr.AtmosphereResourceImpl.onDisconnect(AtmosphereResourceImpl.java:809)
>     at org.atmosphere.cpr.AtmosphereResourceImpl.notifyListeners(AtmosphereResourceImpl.java:754)
>     at org.atmosphere.cpr.AtmosphereResourceImpl.resume(AtmosphereResourceImpl.java:327)
>     at org.atmosphere.cpr.DefaultBroadcaster.resumeAll(DefaultBroadcaster.java:315)
>     at org.atmosphere.cpr.DefaultBroadcasterFactory.destroy(DefaultBroadcasterFactory.java:307)
>     at org.atmosphere.cpr.AtmosphereFramework.destroy(AtmosphereFramework.java:930)
>     at org.atmosphere.cpr.AtmosphereServlet.destroy(AtmosphereServlet.java:186)
>     at org.apache.catalina.core.StandardWrapper.unload(StandardWrapper.java:1465)
>     at org.apache.catalina.core.StandardWrapper.stopInternal(StandardWrapper.java:1823)
>     at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
>     at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5463)
>     at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
>     at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1575)
>     at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1564)
>     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>     at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>     at java.lang.Thread.run(Thread.java:662)
> {noformat}
> The NPE occurs because the Wicket application has already been destroyed. It it destroyed by the Wicket filter's destroy() method, which is invoked by ReflectorServletProcessor.destroy(). AtmosphereFramework.destroy() first destroys the handler, and then it destroys the broadcast factory (which resumes the resources).
> Jean-Francois says the bug is not in Atmosphere: https://github.com/Atmosphere/atmosphere/issues/812

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