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Created attachment 193017 [details] RAP example that demonstrates the NPE error on shutdown When shutting down a RAP application with a "close" in the OSGi console, an NPE is thrown. I'm using the current CVS HEAD RAP 1.4 bundles, current Eclipse 3.7 Milestone and Eclipse 1.4 M6 target for the other bundles. I attached a simple RAP project that can be imported into Eclipse. I can reliably reproduce this error everytime I start this small example. This error does not seem to occur with the bundles from the 1.4 M6 target platform! Stacktrace: 2011-04-12 11:14:27.592:WARN:/:ERROR: Exception while disposing shell: Shell {RAP with a View} java.lang.NullPointerException at org.eclipse.ui.preferences.ScopedPreferenceStoreCore.disposePreferenceStoreListener(ScopedPreferenceStoreCore.java:821) at org.eclipse.ui.preferences.ScopedPreferenceStoreCore.removePropertyChangeListener(ScopedPreferenceStoreCore.java:570) at org.eclipse.ui.preferences.ScopedPreferenceStore.removePropertyChangeListener(ScopedPreferenceStore.java:676) at org.eclipse.ui.internal.preferences.PreferenceStoreAdapter.detachListener(PreferenceStoreAdapter.java:46) at org.eclipse.ui.internal.preferences.PropertyMapAdapter.dispose(PropertyMapAdapter.java:59) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.presentationDisposed(TabbedStackPresentation.java:352) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.access$3(TabbedStackPresentation.java:351) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$2.widgetDisposed(TabbedStackPresentation.java:195) at org.eclipse.swt.events.DisposeEvent.dispatchToObserver(DisposeEvent.java:64) at org.eclipse.rwt.internal.events.Event.processEvent(Event.java:44) at org.eclipse.swt.events.TypedEvent.processEvent(TypedEvent.java:163) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:772) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:820) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:774) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:820) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:774) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:820) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:774) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:820) at org.eclipse.swt.widgets.Shell.releaseChildren(Shell.java:1092) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:774) at org.eclipse.swt.widgets.Display.disposeShells(Display.java:725) at org.eclipse.swt.widgets.Display.release(Display.java:691) at org.eclipse.swt.graphics.Device.dispose(Device.java:282) at org.eclipse.rwt.internal.lifecycle.UIThread.processShutdown(UIThread.java:159) at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:113) at java.lang.Thread.run(Thread.java:662) at org.eclipse.rwt.internal.lifecycle.UIThread.run(UIThread.java:102)
Ben, I can't reproduce it with current CVS HEAD and your example project. Could you confirm that it's still reproducible for you? I've just fixed the bug 342516 (execute dispose code twice in some cases). Maybe related, but not sure.
I can still produce it with the m6 target bundles and the CVS bundles. - Start application - When the application has started in the browser -> "close" in console I'm using Ubuntu 10.10 64-Bit with Sun Java 1.6.0_24. As we've seen in Bug 336852, those exceptions can vary from setup to setup and sometimes it even seems that the system may be in a bad mood ;). The odd thing is, that this error does not occur with my main application any more. Although I'm using the same RAP and Eclipse/Equinox bundles. When I find the time I can try so setup an Eclipse environment in my Windows VM and do some further investigations.
Ben, your test project still works for me with 1.5M4 (CVS HEAD). I will close this bug as WORKSFORME. Please reopen if the problem persists and you have more information to share.
