nullPointerException launching compare editor in eclipse

[aoliver]

I get this error when attempting to launch the compare editor in eclipse:

!ENTRY org.eclipse.jface 4 2 2013-04-04 14:54:37.556
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
java.lang.NullPointerException
   at org.activiti.designer.eclipse.editor.ActivitiDiagramMatchingStrategy.matches(ActivitiDiagramMatchingStrategy.java:20)
   at org.eclipse.ui.internal.EditorManager.findEditors(EditorManager.java:510)
   at org.eclipse.ui.internal.EditorManager.findEditors(EditorManager.java:457)
   at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:420)
   at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2900)
   at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2863)
   at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2855)
   at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2806)
   at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2802)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2786)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2777)
   at org.eclipse.compare.internal.CompareUIPlugin$1.run(CompareUIPlugin.java:523)
   at org.eclipse.compare.internal.CompareUIPlugin.syncExec(CompareUIPlugin.java:1265)
   at org.eclipse.compare.internal.CompareUIPlugin.internalOpenEditor(CompareUIPlugin.java:534)
   at org.eclipse.compare.internal.CompareUIPlugin.openEditorInBackground(CompareUIPlugin.java:504)
   at org.eclipse.compare.internal.CompareUIPlugin.openCompareEditor(CompareUIPlugin.java:493)
   at org.eclipse.compare.CompareUI.openCompareEditorOnPage(CompareUI.java:168)
   at org.eclipse.compare.CompareUI.openCompareEditorOnPage(CompareUI.java:149)
   at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.openCompareEditor(OpenInCompareAction.java:223)
   at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.openCompareEditor(OpenInCompareAction.java:181)
   at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.openCompareEditorOnSyncInfo(OpenInCompareAction.java:161)
   at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.run(OpenInCompareAction.java:65)
   at org.eclipse.team.internal.ui.synchronize.actions.OpenWithActionGroup.openInCompareEditor(OpenWithActionGroup.java:189)
   at org.eclipse.team.internal.ui.synchronize.actions.DefaultSynchronizePageActions$1.run(DefaultSynchronizePageActions.java:47)
   at org.eclipse.team.internal.ui.synchronize.StructuredViewerAdvisor.handleOpen(StructuredViewerAdvisor.java:189)
   at org.eclipse.team.internal.ui.synchronize.StructuredViewerAdvisor.access$0(StructuredViewerAdvisor.java:185)
   at org.eclipse.team.internal.ui.synchronize.StructuredViewerAdvisor$3.open(StructuredViewerAdvisor.java:146)
   at org.eclipse.ui.OpenAndLinkWithEditorHelper$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.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.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
   at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
   at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
   at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
   at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
   at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
   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(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   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)
   at org.eclipse.equinox.launcher.Main.main(Main.java:1414)


I am running eclipse 3.7.2 in SpringSource Tool Suite 2.9.2 with Activit Eclipse BPMN 2.0 Designer 5.12.0.

I also tried on STS 3.2 using eclipse 3.8.1 with activiti designer 5.12.0 and received same error.

Is there some configuration change i need to make for activiti designer 5.12.0?

thanks in advance for your help,
awo

[trademak]

Hi,

Yes I can reproduce this issue as well.
But my main question is, which result do you expect from the compare feature?
Because we don't do visual compare yet or so.

Best regards,

[aoliver]

i was only trying to compare java files and got this error.  It seems, in my case, the latest version completely breaks compare within eclipse.

Thanks again for your help.

[trademak]

Ah ok, I'll validate this and make sure it gets fixed.

Best regards,

[keymaster]

Hi,
I added http://jira.codehaus.org/browse/ACT-1643 for a simalar UseCase (Open Declaration (F3)). I am afraid, this problem occours in many more UseCases.
Regards,
Wolf