Bug 562220 - NPE after closing all perspectives
Summary: NPE after closing all perspectives
Status: NEW
Alias: None
Product: Platform
Classification: Eclipse Project
Component: UI (show other bugs)
Version: 4.12   Edit
Hardware: PC Linux
: P3 normal (vote)
Target Milestone: ---   Edit
Assignee: Platform-UI-Inbox CLA
QA Contact:
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-04-16 10:01 EDT by Simeon Andreev CLA
Modified: 2020-04-16 16:12 EDT (History)
1 user (show)

See Also:

Attachments
Video showing the problem with the reproduction steps from the description. (1.49 MB, video/mp4)
2020-04-16 10:01 EDT, Simeon Andreev CLA 		no flags Details
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Description Simeon Andreev CLA 2020-04-16 10:01:02 EDT 
Created attachment 282474 [details]
Video showing the problem with the reproduction steps from the description.

Steps to reproduce:

1. Start Eclipse (e.g. in a new workspace).
2. Main menu -> Window -> Perspective -> Close All Perspectives.
3. Main menu -> Window -> Perspective -> Open Perspective -> Other... -> Java (default).
4. Click on one of the view placeholders in the bottom view stack, e.g. "Javadoc" or "Declaration".
5. Observe NPEs in the Error Log (see stack traces below).

This occurs quite frequently, but not always. You might need to repeat the reproduction steps a time or two, or click through different view tabs.

java.lang.NullPointerException
	at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.lambda$1(CompatibilityPart.java:122)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.lambda$0(UIEventHandler.java:38)
	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:236)
	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133)
	at org.eclipse.swt.widgets.Display.syncExec(Display.java:5795)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:219)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38)
	at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:205)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:203)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:151)
	at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:132)
	at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:75)
	at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:44)
	at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:55)
	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:63)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:424)
	at org.eclipse.e4.ui.model.application.ui.basic.impl.PartImpl.setObject(PartImpl.java:446)
	at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer.createWidget(ContributedPartRenderer.java:133)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:1002)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:662)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$1.run(PartRenderingEngine.java:547)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:531)
	at org.eclipse.e4.ui.workbench.renderers.swt.ElementReferenceRenderer.createWidget(ElementReferenceRenderer.java:73)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:1002)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:662)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:768)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$0(PartRenderingEngine.java:739)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$2.run(PartRenderingEngine.java:733)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:717)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$1.handleEvent(PartServiceImpl.java:112)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.lambda$0(UIEventHandler.java:38)
	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:236)
	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133)
	at org.eclipse.swt.widgets.Display.syncExec(Display.java:5795)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:219)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38)
	at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:205)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:203)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:151)
	at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:132)
	at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:75)
	at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:44)
	at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:55)
	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:63)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:424)
	at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElementGen(ElementContainerImpl.java:170)
	at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:188)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.lambda$3(StackRenderer.java:1061)
	at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:84)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5685)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1423)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1449)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1432)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1221)
	at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3232)
	at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1880)
	at org.eclipse.swt.custom.CTabFolder.lambda$0(CTabFolder.java:330)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5685)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1423)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4953)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4446)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1160)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1049)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1447)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1420)

java.lang.NullPointerException
	at org.eclipse.jdt.internal.ui.infoviews.AbstractInfoView$1.partVisible(AbstractInfoView.java:112)
	at org.eclipse.ui.internal.PartService$12.run(PartService.java:217)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.ui.internal.PartService.partVisible(PartService.java:214)
	at org.eclipse.ui.internal.WorkbenchPage$17.run(WorkbenchPage.java:5219)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.ui.internal.WorkbenchPage.firePartVisible(WorkbenchPage.java:5216)
	at org.eclipse.ui.internal.WorkbenchPage.access$8(WorkbenchPage.java:5206)
	at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partVisible(WorkbenchPage.java:254)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$6.run(PartServiceImpl.java:301)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartVisible(PartServiceImpl.java:298)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.access$3(PartServiceImpl.java:296)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$1.handleEvent(PartServiceImpl.java:113)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.lambda$0(UIEventHandler.java:38)
	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:236)
	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133)
	at org.eclipse.swt.widgets.Display.syncExec(Display.java:5795)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:219)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38)
	at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:205)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:203)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:151)
	at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:132)
	at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:75)
	at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:44)
	at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:55)
	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:63)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:424)
	at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElementGen(ElementContainerImpl.java:170)
	at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:188)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.lambda$3(StackRenderer.java:1061)
	at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:84)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5685)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1423)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1449)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1432)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1221)
	at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3232)
	at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1880)
	at org.eclipse.swt.custom.CTabFolder.lambda$0(CTabFolder.java:330)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5685)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1423)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4953)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4446)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1160)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1049)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1447)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1420)


See the attached video "npe_after_closing_all_perspectives.mp4".


We first observed this in 4.12, but I can reproduce with 4.16 as well:

Eclipse SDK
Version: 2020-06 (4.16)
Build id: I20200409-0200
Comment 1 Simeon Andreev CLA 2020-04-16 10:42:03 EDT 
The page of the view reference is null, which causes the NPE.

Here is the stack which (I think) sets the null page:

"main" #1 prio=6 os_prio=0 tid=0x00007ffff0016800 nid=0xeb43 at breakpoint[0x00007ffff7fcb000]
   java.lang.Thread.State: RUNNABLE
        at org.eclipse.ui.internal.WorkbenchPartReference.setPage(WorkbenchPartReference.java:541)
        at org.eclipse.ui.internal.WorkbenchPage.close(WorkbenchPage.java:1748)
        at org.eclipse.ui.internal.WorkbenchPage.lambda$7(WorkbenchPage.java:1315)
        at org.eclipse.ui.internal.WorkbenchPage$$Lambda$535/524225829.run(Unknown Source)
        at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:72)
        at org.eclipse.ui.internal.WorkbenchPage.close(WorkbenchPage.java:1315)
        at org.eclipse.ui.internal.WorkbenchPage.closeAllPerspectives(WorkbenchPage.java:1712)
        at org.eclipse.ui.internal.handlers.CloseAllPerspectivesHandler.execute(CloseAllPerspectivesHandler.java:36)
        at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:283)
        at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:97)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
        at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:318)
        at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:252)
        at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:173)
        at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:156)
        at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
        at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:487)
        at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)
        at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommand(LegacyHandlerService.java:389)
        at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:142)
        at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:579)
        at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:413)
        at org.eclipse.jface.action.ActionContributionItem$$Lambda$279/538385628.handleEvent(Unknown Source)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
        at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5685)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1423)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4953)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4446)
        at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1160)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
        at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1049)
        at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
        at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658)
        at org.eclipse.ui.internal.Workbench$$Lambda$34/87784678.run(Unknown Source)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:661)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:597)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1476)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1449)

The parts for which I see the stack above are JavadocView, SourceView (Documentation) and the Data Hierarchy view. I.e. the views with place holders, the views that were not opened during the current Eclipse session.

The NPE occurred when clicking on the SourceView view tab, but not when clicking on the JavadocView. On the next reproduction, it occurred for the Data hierarchy view but not for the Javadoc/Documentation views. The view reference which causes the NPE is the one that received the call above, i.e. for some reason the view reference survived closing the perspective and is re-used, but broken.
Comment 2 Andrey Loskutov CLA 2020-04-16 16:12:10 EDT 
It is Platform UI issue.