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Null Pointer error when opening an Activiti diagram

Question asked by pranam on Mar 26, 2012
Latest reply on May 2, 2012 by trademak
Dear all,

I have been modelling a process using Activiti Process Designer on Eclipse and was able to model without issues. But all of a sudden, one of the diagrams stopped opening. If I try to open the diagram in Eclipse getting the below error. Could you please advice? I am using Eclipse Indigo Version: Indigo Service Release 1 Build id: 20110916-0149. Thank you in advance.

java.lang.NullPointerException
   at org.eclipse.graphiti.internal.services.impl.MigrationServiceImpl.shouldMigrate070To080(MigrationServiceImpl.java:85)
   at org.activiti.designer.eclipse.editor.ActivitiDiagramEditor.setInput(ActivitiDiagramEditor.java:118)
   at org.eclipse.gef.ui.parts.GraphicalEditor.init(GraphicalEditor.java:346)
   at org.eclipse.graphiti.ui.internal.editor.DiagramEditorInternal.init(DiagramEditorInternal.java:1093)
   at org.activiti.designer.eclipse.editor.ActivitiDiagramEditor.init(ActivitiDiagramEditor.java:51)
   at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:828)
   at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:647)
   at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
   at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
   at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:289)
   at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2945)
   at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2850)
   at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2842)
   at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2793)
   at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2789)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2773)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2764)
   at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651)
   at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610)
   at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:355)
   at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:164)
   at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:249)
   at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:228)
   at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:275)
   at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:251)
   at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:376)
   at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:538)
   at org.eclipse.ui.OpenAndLinkWithEditorHelper$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:4165)
   at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
   at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
   at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
   at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
   at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
   at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
   at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
   at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
   at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
   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:344)
   at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
   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.launcher.Main.invokeFramework(Main.java:622)
   at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
   at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

Outcomes