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I20040225 My workbench had been running for a while and I had previously switched between Java and Debug perspectives. The NPE happened after a breakpoint was hit, but the perspective was still the Java. I then switched manually pressing the pers. icon, and the following was in my log. After this, my workbench was in a bad state, debugging didn't really work, editors couldn't be opened. java.lang.NullPointerException at org.eclipse.ui.internal.PerspectivePresentation.addPart(PerspectivePresentation.java:203) at org.eclipse.ui.internal.Perspective.showView(Perspective.java:1400) at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:720) at org.eclipse.ui.internal.WorkbenchPage.access$9(WorkbenchPage.java:697) at org.eclipse.ui.internal.WorkbenchPage$13.run(WorkbenchPage.java:2882) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:84) at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:2879) at org.eclipse.debug.internal.ui.views.launch.LaunchViewContextListener.contextActivated(LaunchViewContextListener.java:235) at org.eclipse.debug.internal.ui.views.launch.LaunchViewContextListener.contextChanged(LaunchViewContextListener.java:173) at org.eclipse.ui.internal.contexts.Context.fireContextChanged(Context.java:117) at org.eclipse.ui.internal.contexts.MutableContextManager.notifyContexts(MutableContextManager.java:140) at org.eclipse.ui.internal.contexts.MutableContextManager.setEnabledContextIds(MutableContextManager.java:274) at org.eclipse.debug.internal.ui.views.launch.LaunchView.showViewsForCurrentSelection(LaunchView.java:554) at org.eclipse.debug.internal.ui.views.launch.LaunchView.selectionChanged(LaunchView.java:500) at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:159) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:788) at org.eclipse.core.runtime.Platform.run(Platform.java:497) at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:157) at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:1310) at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1033) at org.eclipse.debug.internal.ui.views.launch.LaunchView.autoExpand(LaunchView.java:1098) at org.eclipse.debug.internal.ui.views.launch.LaunchView.initializeSelection(LaunchView.java:372) at org.eclipse.debug.internal.ui.views.launch.LaunchView.becomesVisible(LaunchView.java:1363) at org.eclipse.debug.ui.AbstractDebugView$DebugViewPartListener.partVisible(AbstractDebugView.java:161) at org.eclipse.ui.internal.PartListenerList2$7.run(PartListenerList2.java:175) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:788) at org.eclipse.core.runtime.Platform.run(Platform.java:497) at org.eclipse.ui.internal.PartListenerList2.firePartVisible(PartListenerList2.java:173) at org.eclipse.ui.internal.WorkbenchPage$1.propertyChange(WorkbenchPage.java:136) at org.eclipse.ui.internal.LayoutPart.setVisible(LayoutPart.java:234) at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:376) at org.eclipse.ui.internal.PartTabFolder.setSelection(PartTabFolder.java:1221) at org.eclipse.ui.internal.PartTabFolder.setSelection(PartTabFolder.java:1205) at org.eclipse.ui.internal.PartTabFolder.createControl(PartTabFolder.java:546) at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:240) at org.eclipse.ui.internal.PerspectivePresentation.activate(PerspectivePresentation.java:117) at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:629) at org.eclipse.ui.internal.WorkbenchPage.setPerspective(WorkbenchPage.java:2666) at org.eclipse.ui.internal.WorkbenchPage.busySetPerspective(WorkbenchPage.java:687) at org.eclipse.ui.internal.WorkbenchPage.access$8(WorkbenchPage.java:672) at org.eclipse.ui.internal.WorkbenchPage$12.run(WorkbenchPage.java:2796) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:84) at org.eclipse.ui.internal.WorkbenchPage.setPerspective(WorkbenchPage.java:2794) at org.eclipse.ui.internal.PerspectiveBarContributionItem$2.widgetSelected(PerspectiveBarContributionItem.java:92) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:89) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:833) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2352) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2033) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1566) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1542) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:263) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:139) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:47) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:256) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:100) 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:324) at org.eclipse.core.launcher.Main.basicRun(Main.java:279) at org.eclipse.core.launcher.Main.run(Main.java:742) at org.eclipse.core.launcher.Main.main(Main.java:581)
Had you switched to the Debug perspective previously in the same session? It looks like it's lazily recreating the Debug perspective. While it's doing this, the configured contexts are changed resulting in new views being shown. But the PerspectivePresentation does not seem to be fully initialized at this time. At line 203 of PerspectivePresentation, it must be folder.getControl() that is returning null. Kim, can you investigate?
Psst. You need to add me to the CC list. :) This seems to be a dupe of 56176. I tried tracking this down earlier but I was unable to reproduce it. There are several other debug problems that are similar to this. I figure your guess is right, however...
*** This bug has been marked as a duplicate of 54928 ***
