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Build ID: I20061214-1445 Steps To Reproduce: using JDK 1.6.0, don't know exact steps to reproduce More information: eclipse.buildId=I20061214-1445 java.version=1.6.0 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=de_DE Command-line arguments: -os linux -ws gtk -arch x86_64 -data /home/jfrantzius/Documents/eclipse_workspaces/sgw2 Error Thu Jan 11 12:28:01 CET 2007 An unexpected exception was thrown. java.lang.NullPointerException at org.eclipse.ui.XMLMemento.getChildren(XMLMemento.java:235) at org.eclipse.ui.internal.WorkingSet.restoreWorkingSet(WorkingSet.java:144) at org.eclipse.ui.internal.AbstractWorkingSet.getElementsArray(AbstractWorkingSet.java:151) at org.eclipse.ui.internal.AbstractWorkingSet.getElements(AbstractWorkingSet.java:139) at org.eclipse.ui.internal.actions.ModifyWorkingSetDelegate.selectionChanged(ModifyWorkingSetDelegate.java:216) at org.eclipse.ui.internal.PluginAction.refreshEnablement(PluginAction.java:208) at org.eclipse.ui.internal.PluginAction.selectionChanged(PluginAction.java:279) at org.eclipse.ui.internal.PluginAction.selectionChanged(PluginAction.java:301) at org.eclipse.ui.internal.AbstractSelectionService.fireSelection(AbstractSelectionService.java:156) at org.eclipse.ui.internal.AbstractSelectionService$1.selectionChanged(AbstractSelectionService.java:62) at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:850) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:45) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:153) at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160) at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2004) at org.eclipse.jface.viewers.StructuredViewer.handleInvalidSelection(StructuredViewer.java:1101) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1345) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1395) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1354) at org.eclipse.pde.internal.runtime.logview.LogView$20.run(LogView.java:665) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3203) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2901) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1945) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1909) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:425) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95) 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:597) at org.eclipse.equinox.internal.app.EclipseAppContainer.callMethod(EclipseAppContainer.java:522) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:147) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:74) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:170) 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:597) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:339) at org.eclipse.core.launcher.Main.basicRun(Main.java:283) at org.eclipse.core.launcher.Main.run(Main.java:984) at org.eclipse.core.launcher.Main.main(Main.java:959)
*** Bug 182665 has been marked as a duplicate of this bug. ***
Created attachment 164763 [details] MultiHandler.java I wasn't able to reproduce this by using multiple threads and brute force. I also wasn't able to find a read only memento being used as a writeable memento. I suspect that the structure of the working set code had changed by the 3.3 release to make this scenario unlikely (and also that it was something in the working set code that was causing the problem). I'm not going to close it since I have no proof, however this has not been a common problem since then. PW
I also have not seen this in the recent years. Marking as WORKSFORME.
