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After deleting a couple of associations between actors and use cases, I closed the editor on a use case diagram. Then, I tried to reopen it and got the following stack error: java.lang.ClassCastException: org.eclipse.uml2.uml.internal.impl.PackageImpl cannot be cast to org.eclipse.uml2.uml.Association at org.eclipse.papyrus.diagram.usecase.edit.parts.AssociationEditPart.refreshVisuals(AssociationEditPart.java:166) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:676) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:571) at org.eclipse.gef.editparts.AbstractConnectionEditPart.refresh(AbstractConnectionEditPart.java:221) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.access$1(ConnectionEditPart.java:1) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart$5.run(ConnectionEditPart.java:1127) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.refresh(ConnectionEditPart.java:1124) at org.eclipse.gef.editparts.AbstractConnectionEditPart.setTarget(AbstractConnectionEditPart.java:295) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addTargetConnection(AbstractGraphicalEditPart.java:278) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refreshTargetConnections(AbstractGraphicalEditPart.java:674) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:573) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.access$3(GraphicalEditPart.java:1) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart$3.run(GraphicalEditPart.java:861) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.refresh(GraphicalEditPart.java:851) at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:235) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:219) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:198) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.addChild(GraphicalEditPart.java:1319) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:727) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:677) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:571) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.access$3(GraphicalEditPart.java:1) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart$3.run(GraphicalEditPart.java:861) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.refresh(GraphicalEditPart.java:851) at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:235) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:219) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:198) at org.eclipse.gef.editparts.SimpleRootEditPart.setContents(SimpleRootEditPart.java:101) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:601) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer.setContents(DiagramGraphicalViewer.java:378) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:610) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.initializeGraphicalViewerContents(DiagramEditor.java:872) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.initializeGraphicalViewer(DiagramEditor.java:865) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditorWithFlyOutPalette.initializeGraphicalViewer(DiagramEditorWithFlyOutPalette.java:116) at org.eclipse.gmf.runtime.diagram.ui.resources.editor.parts.DiagramDocumentEditor.initializeGraphicalViewer(DiagramDocumentEditor.java:175) at org.eclipse.papyrus.diagram.usecase.part.UMLDiagramEditor.initializeGraphicalViewer(UMLDiagramEditor.java:530) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.createGraphicalViewer(DiagramEditor.java:807) at org.eclipse.papyrus.diagram.usecase.UmlUseCaseDiagramForMultiEditor.createGraphicalViewer(UmlUseCaseDiagramForMultiEditor.java:101) at org.eclipse.gef.ui.parts.GraphicalEditor.createPartControl(GraphicalEditor.java:163) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.createPartControl(DiagramEditor.java:1580) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditorWithFlyOutPalette.createPartControl(DiagramEditorWithFlyOutPalette.java:328) at org.eclipse.gmf.runtime.diagram.ui.resources.editor.parts.DiagramDocumentEditor.createPartControl(DiagramDocumentEditor.java:1511) at org.eclipse.papyrus.sasheditor.internal.EditorPart.createEditorPartControl(EditorPart.java:264) at org.eclipse.papyrus.sasheditor.internal.EditorPart.createPartControl(EditorPart.java:169) at org.eclipse.papyrus.sasheditor.internal.TabFolderPart.createChildPart(TabFolderPart.java:888) at org.eclipse.papyrus.sasheditor.internal.TabFolderPart.createTabItem(TabFolderPart.java:815) at org.eclipse.papyrus.sasheditor.internal.TabFolderPart.synchronize2(TabFolderPart.java:730) at org.eclipse.papyrus.sasheditor.internal.RootPart.synchronize2(RootPart.java:139) at org.eclipse.papyrus.sasheditor.internal.SashWindowsContainer.refreshTabsInternal(SashWindowsContainer.java:358) at org.eclipse.papyrus.sasheditor.internal.SashWindowsContainer.refreshTabs(SashWindowsContainer.java:327) at org.eclipse.papyrus.sasheditor.editor.AbstractMultiPageSashEditor.refreshTabs(AbstractMultiPageSashEditor.java:164) at org.eclipse.papyrus.core.editor.CoreMultiDiagramEditor.access$2(CoreMultiDiagramEditor.java:1) at org.eclipse.papyrus.core.editor.CoreMultiDiagramEditor$2.contentChanged(CoreMultiDiagramEditor.java:168) at org.eclipse.papyrus.sasheditor.contentprovider.di.internal.ContentChangedEventProvider.fireContentChanged(ContentChangedEventProvider.java:162) at org.eclipse.papyrus.sasheditor.contentprovider.di.internal.ContentChangedEventProvider$EMFAdapter.notifyChanged(ContentChangedEventProvider.java:194) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:380) at org.eclipse.emf.ecore.util.EcoreEList.dispatchNotification(EcoreEList.java:255) at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:300) at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:307) at org.eclipse.papyrus.sashwindows.di.impl.TabFolderImpl.addPage(TabFolderImpl.java:91) at org.eclipse.papyrus.sashwindows.di.impl.SashModelImpl.addPage(SashModelImpl.java:145) at org.eclipse.papyrus.sasheditor.contentprovider.di.internal.PageMngrImpl.openPage(PageMngrImpl.java:141) at org.eclipse.papyrus.sasheditor.contentprovider.di.internal.TransactionalPageMngrImpl$5.doExecute(TransactionalPageMngrImpl.java:164) at org.eclipse.emf.transaction.RecordingCommand.execute(RecordingCommand.java:135) at org.eclipse.emf.common.command.BasicCommandStack.execute(BasicCommandStack.java:84) at org.eclipse.emf.transaction.impl.AbstractTransactionalCommandStack.basicExecute(AbstractTransactionalCommandStack.java:241) at org.eclipse.emf.transaction.impl.TransactionalCommandStackImpl.doExecute(TransactionalCommandStackImpl.java:63) at org.eclipse.emf.transaction.impl.AbstractTransactionalCommandStack.execute(AbstractTransactionalCommandStack.java:165) at org.eclipse.emf.transaction.impl.AbstractTransactionalCommandStack.execute(AbstractTransactionalCommandStack.java:219) at org.eclipse.papyrus.sasheditor.contentprovider.di.internal.TransactionalPageMngrImpl.openPage(TransactionalPageMngrImpl.java:169) at org.eclipse.papyrus.navigator.ModelNavigator.handleDoubleClickOnDiagram(ModelNavigator.java:579) at org.eclipse.papyrus.navigator.ModelNavigator.handleDoubleClick(ModelNavigator.java:554) at org.eclipse.ui.navigator.CommonNavigator$4.doubleClick(CommonNavigator.java:521) at org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:821) 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.fireDoubleClick(StructuredViewer.java:819) at org.eclipse.jface.viewers.AbstractTreeViewer.handleDoubleSelect(AbstractTreeViewer.java:1418) at org.eclipse.ui.navigator.CommonViewer.handleDoubleSelect(CommonViewer.java:454) at org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1195) at org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:238) at org.eclipse.jface.util.OpenStrategy.access$0(OpenStrategy.java:235) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:296) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1050) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4037) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3628) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2416) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2380) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2229) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:504) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:497) 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:619) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) at org.eclipse.equinox.launcher.Main.run(Main.java:1406)
This bug seems to be fixed Test on use case diagram has to be added before closing this bug
