Some Eclipse Foundation services are deprecated, or will be soon. Please ensure you've read this important communication.

Bug 329356

Summary:	NPE in org.eclipse.jdt.internal.ui.text.JavaReconciler.uninstall
Product:	[Eclipse Project] JDT	Reporter:	Olivier Thomann <Olivier_Thomann>
Component:	Text	Assignee:	JDT-Text-Inbox <jdt-text-inbox>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	normal
Priority:	P3	CC:	daniel_megert
Version:	3.7
Target Milestone:	---
Hardware:	PC
OS:	Windows 7
Whiteboard:

Description Olivier Thomann

2010-11-03 10:46:38 EDT

Using I20101029-1118 (4.1 build), I got the following exception.

Unfortunately no steps to reproduce for now.

!ENTRY org.eclipse.e4.ui.workbench.swt 4 2 2010-11-03 10:42:08.891
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.e4.ui.workbench.swt".
!STACK 0
java.lang.NullPointerException
	at org.eclipse.jdt.internal.ui.text.JavaReconciler.uninstall(JavaReconciler.java:341)
	at org.eclipse.jface.text.source.SourceViewer.unconfigure(SourceViewer.java:706)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer.unconfigure(JavaSourceViewer.java:357)
	at org.eclipse.jface.text.source.SourceViewer.handleDispose(SourceViewer.java:759)
	at org.eclipse.jface.text.source.projection.ProjectionViewer.handleDispose(ProjectionViewer.java:1363)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer.handleDispose(JavaSourceViewer.java:462)
	at org.eclipse.jface.text.TextViewer$2.widgetDisposed(TextViewer.java:1799)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:123)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774)
	at org.eclipse.swt.custom.StyledText.handleDispose(StyledText.java:5829)
	at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5655)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1058)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:808)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:872)
	at org.eclipse.swt.widgets.Canvas.releaseChildren(Canvas.java:167)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:811)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:872)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:811)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:872)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:811)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:872)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:811)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:872)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:811)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:872)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:811)
	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:872)
	at org.eclipse.swt.widgets.Widget.release(Widget.java:811)
	at org.eclipse.swt.widgets.Widget.dispose(Widget.java:446)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.disposeWidget(SWTPartRenderer.java:134)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:629)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$1(PartRenderingEngine.java:592)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:587)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:573)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$1.handleEvent(PartRenderingEngine.java:134)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:41)
	at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
	at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135)
	at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78)
	at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39)
	at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:73)
	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:380)
	at org.eclipse.e4.ui.model.application.ui.basic.impl.PartImpl.setToBeRendered(PartImpl.java:552)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.hidePart(PartServiceImpl.java:882)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.hidePart(PartServiceImpl.java:832)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.closePart(StackRenderer.java:493)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.access$5(StackRenderer.java:478)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer$5.close(StackRenderer.java:461)
	at org.eclipse.e4.ui.widgets.CTabFolder.onMouse(CTabFolder.java:1637)
	at org.eclipse.e4.ui.widgets.CTabFolder$2.handleEvent(CTabFolder.java:270)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4084)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3675)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$6.run(PartRenderingEngine.java:783)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:692)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:104)
	at org.eclipse.ui.internal.Workbench$3.run(Workbench.java:542)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:524)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:621)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:576)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1409)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1385)

Comment 1 Dani Megert

2010-11-03 10:59:30 EDT

Could the Java compare editor be involved?
Is the editor detached?

Comment 2 Olivier Thomann

2010-11-03 11:01:06 EDT

It looks like:
fTextEditor.getSite() can return null.

Comment 3 Olivier Thomann

2010-11-03 11:02:46 EDT

I got NPE inside e4 just before this happened. So I guess it might be related to some UI not properly initialized.
See bug 329355 and bug 329358.

Comment 4 Dani Megert

2010-11-03 11:14:19 EDT

(In reply to comment #2)
> It looks like:
> fTextEditor.getSite() can return null.

Well, it *is* null but it is not *allowed* to be null at the time of disposal (see Javadoc).

Most likely during part close, the disposal of the widgets is not directly done but somehow done later (async). This can perfectly be caused by the NPE mentioned in the previous comment (bug 329355).

Closing as DUP since there's no FUP field.

*** This bug has been marked as a duplicate of bug 329355 ***