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Bug 370026

Summary:	NPE in PartActivationHistory.activate() in almost fresh 4.2M5
Product:	[Eclipse Project] Platform	Reporter:	Stephan Herrmann <stephan.herrmann>
Component:	UI	Assignee:	Remy Suen <remy.suen>
Status:	VERIFIED FIXED	QA Contact:	Remy Suen <remy.suen>
Severity:	normal
Priority:	P3	CC:	ahmetarifmagara, emoffatt, pwebster, remy.suen, strider80
Version:	4.2
Target Milestone:	4.2 M6
Hardware:	All
OS:	All
Whiteboard:

Description Stephan Herrmann

2012-01-27 18:25:02 EST

I've seen some similar stack traces but couldn't identify any clear duplicate,
so here it comes:

Freshly installed Eclipse SDK 4.2 M5
Added some more stuff: Object Teams, EGit, Mylyn (assorted)
Restart and immediately get this NPE (reported via an InjectionException):


java.lang.NullPointerException
	at org.eclipse.e4.ui.internal.workbench.PartActivationHistory.activate(PartActivationHistory.java:52)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:560)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:531)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:520)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:950)
	at org.eclipse.ui.internal.WorkbenchPage.showPart(WorkbenchPage.java:959)
	at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:938)
	at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:3442)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3439)
	at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3415)
	at org.eclipse.ui.internal.WorkbenchIntroManager.createIntro(WorkbenchIntroManager.java:178)
	at org.eclipse.ui.internal.WorkbenchIntroManager.showIntro(WorkbenchIntroManager.java:125)
	at org.eclipse.ui.application.WorkbenchWindowAdvisor.openIntro(WorkbenchWindowAdvisor.java:190)
	at org.eclipse.ui.internal.ide.application.IDEWorkbenchWindowAdvisor.openIntro(IDEWorkbenchWindowAdvisor.java:564)
	at org.eclipse.ui.internal.WorkbenchWindow.setup(WorkbenchWindow.java:610)
	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:616)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)

I haven't even started using Eclipse, so I can't say if/what functionality actually suffers.

Comment 1 Paul Webster

2012-01-27 18:55:55 EST

Was this the new install with an existing workspace?

PW

Comment 2 Stephan Herrmann

2012-01-27 19:04:01 EST

(In reply to comment #1)
> Was this the new install with an existing workspace?

Fresh install, fresh workspace, and here's how to reproduce:

1. Install Eclipse SDK 4.2 M5
2. Install Object Teams from http://download.eclipse.org/objectteams/updates/m5warmup
  (sorry, no categories, just select all features from that repo)
3. Restart and watch the exception mentioned above while Eclipse is still
   (re)starting.

I see two possible ways how Object Teams could influence the UI at this early point:
- A few bundles will be loaded more eagerly than in a plain SDK.
- We contribute content to the welcome page.
No Object Teams view has been shown at that point.

Actually, the exception is paired with this one:

java.io.IOException: No bundle found for URL: bundleentry://200.fwk8814217/icons/full/eview16/defaultview_misc.gif
	at org.eclipse.osgi.framework.internal.core.BundleResourceHandler.openConnection(BundleResourceHandler.java:167)
	at java.net.URL.openConnection(URL.java:963)
	at org.eclipse.core.runtime.internal.adaptor.URLConverterImpl.toFileURL(URLConverterImpl.java:32)
	at org.eclipse.core.runtime.FileLocator.toFileURL(FileLocator.java:206)
	at org.eclipse.jface.resource.URLImageDescriptor.getFilePath(URLImageDescriptor.java:137)
	at org.eclipse.jface.resource.URLImageDescriptor.createImage(URLImageDescriptor.java:157)
	at org.eclipse.jface.resource.ImageDescriptor.createImage(ImageDescriptor.java:227)
	at org.eclipse.jface.resource.ImageDescriptor.createImage(ImageDescriptor.java:205)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.getImage(SWTPartRenderer.java:178)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.createTab(StackRenderer.java:589)
	at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.processContents(LazyStackRenderer.java:115)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:628)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:628)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
	at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.processContents(WBWRenderer.java:584)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:628)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:938)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:893)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:85)
	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:579)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:534)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
	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:352)
	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:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:624)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:579)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1433)

Comment 3 Remy Suen

2012-01-28 07:35:09 EST

(In reply to comment #0)
> java.lang.NullPointerException
>     at
> org.eclipse.e4.ui.internal.workbench.PartActivationHistory.activate(PartActivationHistory.java:52)
>     at
> org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:560)
>     at
> org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:531)
>     at
> org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:520)
>     at
> org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:950)

This error indicates that the part was not rendered (correctly or at all) since its context is null.

Comment 4 Remy Suen

2012-01-28 08:10:52 EST

(In reply to comment #2)
> 1. Install Eclipse SDK 4.2 M5
> 2. Install Object Teams from
> http://download.eclipse.org/objectteams/updates/m5warmup
>   (sorry, no categories, just select all features from that repo)
> 3. Restart and watch the exception mentioned above while Eclipse is still
>    (re)starting.

I got the image exception but not the NPE. Tested with I20120127-1145 on a 32-bit Windows 7 system.

Comment 5 Stephan Herrmann

2012-01-28 11:03:04 EST

(In reply to comment #3)
> This error indicates that the part was not rendered (correctly or at all) since
> its context is null.

Using -consolelog it looked like the exception was thrown before the main window was shown.

Here's the full stack trace, maybe it helps finding out why the intro (?) was activated before anything was rendered(?):

org.eclipse.e4.core.di.InjectionException: java.lang.NullPointerException
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:63)
	at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:838)
	at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:110)
	at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:80)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.inject(ContextInjectionFactory.java:72)
	at org.eclipse.ui.internal.Workbench.createWorkbenchWindow(Workbench.java:1235)
	at org.eclipse.ui.internal.Workbench.openWorkbenchWindow(Workbench.java:2255)
	at org.eclipse.ui.internal.Workbench.getWorkbenchPage(Workbench.java:1706)
	at org.eclipse.ui.internal.Workbench.setReference(Workbench.java:1725)
	at org.eclipse.ui.internal.Workbench.access$21(Workbench.java:1722)
	at org.eclipse.ui.internal.Workbench$32.handleEvent(Workbench.java:1673)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:41)
	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)
	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
	at org.eclipse.swt.widgets.Display.syncExec(Display.java:4272)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:177)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38)
	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:81)
	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:55)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374)
	at org.eclipse.e4.ui.model.application.ui.basic.impl.PartImpl.setContext(PartImpl.java:422)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:595)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$6.run(PartRenderingEngine.java:505)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:490)
	at org.eclipse.e4.ui.workbench.renderers.swt.ElementReferenceRenderer.createWidget(ElementReferenceRenderer.java:74)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:866)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:616)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:803)
	at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.postProcess(LazyStackRenderer.java:97)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:632)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:628)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
	at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveRenderer.processContents(PerspectiveRenderer.java:59)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:628)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveStackRenderer.showTab(PerspectiveStackRenderer.java:103)
	at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.postProcess(LazyStackRenderer.java:97)
	at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveStackRenderer.postProcess(PerspectiveStackRenderer.java:77)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:632)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:628)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:59)
	at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.processContents(WBWRenderer.java:584)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:628)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:718)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:689)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:683)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:668)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:938)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:893)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:85)
	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:579)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:534)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
	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:352)
	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:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:624)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:579)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1433)
Caused by: java.lang.NullPointerException
	at org.eclipse.e4.ui.internal.workbench.PartActivationHistory.activate(PartActivationHistory.java:52)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:560)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:531)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:520)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:950)
	at org.eclipse.ui.internal.WorkbenchPage.showPart(WorkbenchPage.java:959)
	at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:938)
	at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:3442)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3439)
	at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3415)
	at org.eclipse.ui.internal.WorkbenchIntroManager.createIntro(WorkbenchIntroManager.java:178)
	at org.eclipse.ui.internal.WorkbenchIntroManager.showIntro(WorkbenchIntroManager.java:125)
	at org.eclipse.ui.application.WorkbenchWindowAdvisor.openIntro(WorkbenchWindowAdvisor.java:190)
	at org.eclipse.ui.internal.ide.application.IDEWorkbenchWindowAdvisor.openIntro(IDEWorkbenchWindowAdvisor.java:564)
	at org.eclipse.ui.internal.WorkbenchWindow.setup(WorkbenchWindow.java:610)
	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:616)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
	... 108 more

Comment 6 Remy Suen

2012-02-01 07:46:32 EST

Unfortunately, I still cannot reproduce this problem.

Comment 7 Stephan Herrmann

2012-02-01 15:16:52 EST

(In reply to comment #6)
> Unfortunately, I still cannot reproduce this problem.

I'm surprised. Meanwhile I also tried it on Windows 7 and I saw the exact same two exceptions - always. The only difference I see is that my Windows machine is 64bit, but I'm using a 32bit JVM anyway.

I don't actually know if the NPE causes any real damage, but an exception is an exception, right? :)

Comment 8 Remy Suen

2012-02-01 16:04:53 EST

(In reply to comment #7)
> (In reply to comment #6)
> > Unfortunately, I still cannot reproduce this problem.
> 
> I'm surprised.

Do your colleagues get the same problem?

> Meanwhile I also tried it on Windows 7 and I saw the exact same
> two exceptions - always. The only difference I see is that my Windows machine
> is 64bit, but I'm using a 32bit JVM anyway.

I use a 64-bit JVM myself.

Comment 9 Remy Suen

2012-02-02 11:40:14 EST

I figured out how to induce the problem in an inner although I still cannot reproduce it in an outer. :)

Comment 10 Remy Suen

2012-02-03 10:09:03 EST

Fix pushed to master.
http://git.eclipse.org/c/platform/eclipse.platform.ui.git/commit/?id=f563078786de1ace4db88824cbfa966a1a81f238

Thanks for the bug report, Stephan!

Comment 11 Stephan Herrmann

2012-02-04 08:25:29 EST

Using build N20120203-2000 I can confirm that the NPE is fixed.

Thanks, Remy, for the quick fix!

Interestingly, also the second exception reported in comment 2 is gone.
Is that by accident? :)

Comment 12 Remy Suen

2012-03-13 09:34:12 EDT

(In reply to comment #11)
> Using build N20120203-2000 I can confirm that the NPE is fixed.

Marking as VERIFIED, thanks Stephan.

> Interestingly, also the second exception reported in comment 2 is gone.
> Is that by accident? :)

Sorry that I forgot to respond to this question. I can see the two problems being related. Of course, if you see it again, please do not hesitate to open a new bug, thank you.

Comment 13 Dani Megert

2013-08-20 09:49:39 EDT

*** Bug 415484 has been marked as a duplicate of this bug. ***

Comment 14 Henno Vermeulen

2014-02-10 04:25:52 EST

With 4.3.1 (but not 3.7) I am getting an NPE at the same location. I have a PartListener2Adapter with a partClosed method that tries to reopen the editor that is being closed. (I.e. open a new editor with new but equal editor input).

Workaround is to use Display.asyncExec.