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When working with PyDev, I open a python file and switch to that perspective. I then open a new text file in that project and I get at NavigatorSaveablesService.java:284 that NullPointerException. At the same time, the package explorer closes as well which perhaps is the worst part for me because I have to go reopen it each time the error occurs. This is an example sequence to reproduce, but this error occurs pretty regularly when using the PyDev plugin and opening new files. I used to have this combination working on this computer I am using now and at work I have eclipse + pydev working currently as well, but on my personal computer, this NullPointer issue makes things unusable when doing python development. I am using Juno. My session data is: eclipse.buildId=M20130204-1200 java.version=1.7.0_17 java.vendor=Oracle Corporation BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US Framework arguments: -product org.eclipse.epp.package.jee.product Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product PyDev is at v 2.7.5. The message is: Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".
If you are using PyDev, it's probably the Project Explorer.
No, I actually mean the "PyDev Package Explorer" View
(In reply to comment #2) > No, I actually mean the "PyDev Package Explorer" View Ah yes, this is a view that's based on the CommonNavigator, it's not related to the Java Package Explorer (which is not based on the CommonNavigator). Thanks for the clarification.
Could you please include the NPE stack trace, if you get an NPE. PW
(In reply to comment #4) > Could you please include the NPE stack trace, if you get an NPE. > > PW Ok, here is the full stack trace I get: java.lang.NullPointerException at org.eclipse.ui.internal.navigator.NavigatorSaveablesService.getActiveSaveables(NavigatorSaveablesService.java:284) at org.eclipse.ui.navigator.CommonNavigator.getActiveSaveables(CommonNavigator.java:629) at org.eclipse.ui.internal.SaveableHelper.needsSave(SaveableHelper.java:311) at org.eclipse.ui.internal.SaveAction.updateState(SaveAction.java:95) at org.eclipse.ui.internal.ActiveEditorAction.partBroughtToTop(ActiveEditorAction.java:142) at org.eclipse.ui.internal.PartService$2.run(PartService.java:87) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.PartService.partBroughtToTop(PartService.java:85) at org.eclipse.ui.internal.WorkbenchPage$19.run(WorkbenchPage.java:4593) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.WorkbenchPage.firePartBroughtToTop(WorkbenchPage.java:4591) at org.eclipse.ui.internal.WorkbenchPage.access$12(WorkbenchPage.java:4584) at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partBroughtToTop(WorkbenchPage.java:178) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$6.run(PartServiceImpl.java:249) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartBroughtToTop(PartServiceImpl.java:247) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.access$4(PartServiceImpl.java:245) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$1.handleEvent(PartServiceImpl.java:94) 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:4687) at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:187) 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:80) at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374) at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:171) at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.showElementInWindow(ModelServiceImpl.java:422) at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.bringToTop(ModelServiceImpl.java:389) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.delegateBringToTop(PartServiceImpl.java:606) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:579) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:549) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:538) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:1027) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3047) at org.eclipse.ui.internal.WorkbenchPage.access$22(WorkbenchPage.java:2969) at org.eclipse.ui.internal.WorkbenchPage$8.run(WorkbenchPage.java:2951) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2947) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2911) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2894) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:687) at org.python.pydev.navigator.actions.PyOpenResourceAction.openFiles(PyOpenResourceAction.java:101) at org.python.pydev.navigator.actions.PyOpenPythonFileAction.run(PyOpenPythonFileAction.java:86) at org.eclipse.ui.actions.RetargetAction.run(RetargetAction.java:221) at org.eclipse.ui.navigator.CommonNavigatorManager$3.open(CommonNavigatorManager.java:185) at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48) at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:866) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:864) at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152) at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:462) at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256) at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275) at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309) 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:4169) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1053) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:942) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543) 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:353) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
*** This bug has been marked as a duplicate of bug 394499 ***
