[manjesh]

When I launch MyEclipse (Version: 5.1.1 GA Build id: 20070302-5.1.1-GA), sometimes I get the following NullPointerException in the PackageExporer.
However when I close MyEclipse and relaunch, everything looks fine.

java.lang.NullPointerException
at com.genuitec.eclipse.core.librarymgmt.MEClasspathContainerInitializer.initialize(MEClasspathContainerInitializer.java:41)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:1924)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1267)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:1470)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:2169)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:2073)
at org.eclipse.jdt.internal.core.JavaModelManager.determineIfOnClasspath(JavaModelManager.java:808)
at org.eclipse.jdt.internal.core.JavaModelManager.create(JavaModelManager.java:697)
at org.eclipse.jdt.internal.core.JavaModelManager.create(JavaModelManager.java:626)
at org.eclipse.jdt.core.JavaCore.create(JavaCore.java:1383)
at org.eclipse.jdt.internal.ui.ResourceAdapterFactory.getAdapter(ResourceAdapterFactory.java:44)
at org.eclipse.core.internal.runtime.AdapterFactoryProxy.getAdapter(AdapterFactoryProxy.java:63)
at org.eclipse.core.internal.runtime.AdapterManager.getAdapter(AdapterManager.java:256)
at org.eclipse.core.runtime.PlatformObject.getAdapter(PlatformObject.java:66)
at org.eclipse.jdt.internal.ui.filters.NamePatternFilter.select(NamePatternFilter.java:62)
at org.eclipse.jdt.internal.ui.viewsupport.ProblemTreeViewer.isFiltered(ProblemTreeViewer.java:187)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$PackageExplorerProblemTreeViewer.isFiltered(PackageExplorerPart.java:301)
at org.eclipse.jdt.internal.ui.viewsupport.ProblemTreeViewer.isExpandable(ProblemTreeViewer.java:174)
at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:1900)
at org.eclipse.jface.viewers.AbstractTreeViewer.updatePlus(AbstractTreeViewer.java:2487)
at org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:754)
at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:731)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:705)
at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:892)
at org.eclipse.jface.viewers.AbstractTreeViewer$5.run(AbstractTreeViewer.java:1288)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1323)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$PackageExplorerProblemTreeViewer.preservingSelection(PackageExplorerPart.java:404)
at org.eclipse.jface.viewers.AbstractTreeViewer.inputChanged(AbstractTreeViewer.java:1277)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:250)
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1542)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.createPartControl(PackageExplorerPart.java:638)
at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:332)
at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:197)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566)
at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:290)
at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:525)
at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:140)
at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)
at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:394)
at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1144)
at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:620)
at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:532)
at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:562)
at org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:244)
at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:815)
at org.eclipse.ui.internal.WorkbenchPage.onActivate(WorkbenchPage.java:2436)
at org.eclipse.ui.internal.WorkbenchWindow$6.run(WorkbenchWindow.java:2616)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.ui.internal.WorkbenchWindow.setActivePage(WorkbenchWindow.java:2597)
at org.eclipse.ui.internal.WorkbenchWindow.restoreState(WorkbenchWindow.java:1982)
at org.eclipse.ui.internal.Workbench.doRestoreState(Workbench.java:2873)
at org.eclipse.ui.internal.Workbench.access$14(Workbench.java:2821)
at org.eclipse.ui.internal.Workbench$20.run(Workbench.java:1697)
at org.eclipse.ui.internal.Workbench.runStartupWithProgress(Workbench.java:1437)
at org.eclipse.ui.internal.Workbench.restoreState(Workbench.java:1695)
at org.eclipse.ui.internal.Workbench.access$12(Workbench.java:1666)
at org.eclipse.ui.internal.Workbench$18.run(Workbench.java:1545)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.ui.internal.Workbench.restoreState(Workbench.java:1489)
at org.eclipse.ui.internal.WorkbenchConfigurer.restoreState(WorkbenchConfigurer.java:183)
at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:702)
at org.eclipse.ui.internal.Workbench.init(Workbench.java:1101)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1863)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:422)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
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.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

[Riyad Kalla]

Is there any side effect to the exception? Are you noticing any funcitonality not working when it occurs?

[manjesh]

I get this error in the PackageExplorer area…so I won’t be able to use any of the Package Explorer options at that time. After I close the application and reopen again, everything looks good.

[Riyad Kalla]

Let’s first try the -clean command line arg and see if that helps:
http://www.myeclipseide.com/PNphpBB2+file-viewtopic-t-10280.html

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