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What steps will reproduce the problem? 1. Imported local Task context from a different workspace 2. Any change to task list causes the following exception 3. -- Error Details -- Date: Fri Jul 01 15:01:44 BST 2011 Message: Notification failed for: null Severity: Error Product: Eclipse Platform 3.6.2.v201102101200 (org.eclipse.platform.ide) Plugin: org.eclipse.mylyn.tasks.core Session Data: eclipse.buildId=M20110210-1200 java.version=1.6.0_26 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_GB Framework arguments: -showlocation Command-line arguments: -os win32 -ws win32 -arch x86 -data C:\Projects\workspace -showlocation Exception Stack Trace: java.lang.NullPointerException at org.eclipse.mylyn.internal.tasks.core.TaskList.fireDelta(TaskList.java:260) at org.eclipse.mylyn.internal.tasks.core.TaskList.notifyElementsChanged(TaskList.java:482) at org.eclipse.mylyn.internal.tasks.core.TaskList.notifyElementChanged(TaskList.java:503) at org.eclipse.mylyn.internal.context.ui.commands.ClearContextHandler.run(ClearContextHandler.java:43) at org.eclipse.mylyn.internal.context.ui.editors.ContextEditorFormPage$8.linkActivated(ContextEditorFormPage.java:340) at org.eclipse.ui.forms.widgets.AbstractHyperlink.handleActivate(AbstractHyperlink.java:233) at org.eclipse.ui.forms.widgets.AbstractHyperlink.handleMouseUp(AbstractHyperlink.java:327) at org.eclipse.ui.forms.widgets.AbstractHyperlink.access$2(AbstractHyperlink.java:311) at org.eclipse.ui.forms.widgets.AbstractHyperlink$4.handleEvent(AbstractHyperlink.java:125) 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:4066) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115) 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:369) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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:620) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575) at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
Can you provide steps how you imported the task context?
I have two workspaces configured on different branches of the same codebase. I created a new set of tasks in one. Ran the task export (from file menu) and saved a zip file In the other eclipse/workspace I imported the tasks My problem workspace seemed to correct itself after a restart of eclipse I've just retested on a fresh workspace and not been able to reproduce the problem myself.
Looking at the stack trace it's not clear to me why the listener object would be null. I would recommend updating to the latest version since the code has changed slightly since then. I'll mark this as resolved for now but please reopen in case you encounter this problem again.
