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Hi, I created a class diagram and worked with it. Then I closed it. The next day I wanted to open it again and I got this exception: java.lang.ClassCastException: org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationEditPart cannot be cast to org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart at org.eclipse.papyrus.diagram.clazz.custom.edit.part.AbstractAssociationEditPart.refreshVisuals(AbstractAssociationEditPart.java:100) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:725) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:644) at org.eclipse.gef.editparts.AbstractConnectionEditPart.refresh(AbstractConnectionEditPart.java:226) 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:304) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addTargetConnection(AbstractGraphicalEditPart.java:291) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refreshTargetConnections(AbstractGraphicalEditPart.java:760) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:646) at org.eclipse.gef.editparts.AbstractConnectionEditPart.refresh(AbstractConnectionEditPart.java:226) 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:304) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addTargetConnection(AbstractGraphicalEditPart.java:291) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refreshTargetConnections(AbstractGraphicalEditPart.java:760) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:646) 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.papyrus.diagram.common.editparts.UMLNodeEditPart.refresh(UMLNodeEditPart.java:82) at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:253) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:223) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:212) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.addChild(GraphicalEditPart.java:1319) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:781) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:726) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:644) 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:253) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:223) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:212) at org.eclipse.gef.editparts.SimpleRootEditPart.setContents(SimpleRootEditPart.java:105) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:617) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer.setContents(DiagramGraphicalViewer.java:352) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:626) 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:174) at org.eclipse.papyrus.diagram.clazz.part.UMLDiagramEditor.initializeGraphicalViewer(UMLDiagramEditor.java:476) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.createGraphicalViewer(DiagramEditor.java:807) at org.eclipse.papyrus.diagram.clazz.UmlClassDiagramForMultiEditor.createGraphicalViewer(UmlClassDiagramForMultiEditor.java:97) at org.eclipse.gef.ui.parts.GraphicalEditor.createPartControl(GraphicalEditor.java:171) 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:1510) at org.eclipse.papyrus.sasheditor.internal.EditorPart.createEditorPartControl(EditorPart.java:263) at org.eclipse.papyrus.sasheditor.internal.EditorPart.createPartControl(EditorPart.java:169) at org.eclipse.papyrus.sasheditor.internal.TabFolderPart.createChildPart(TabFolderPart.java:917) at org.eclipse.papyrus.sasheditor.internal.TabFolderPart.createTabItem(TabFolderPart.java:842) at org.eclipse.papyrus.sasheditor.internal.TabFolderPart.synchronize2(TabFolderPart.java:757) at org.eclipse.papyrus.sasheditor.internal.RootPart.synchronize2(RootPart.java:139) at org.eclipse.papyrus.sasheditor.internal.SashWindowsContainer.refreshTabsInternal(SashWindowsContainer.java:431) at org.eclipse.papyrus.sasheditor.internal.SashWindowsContainer.refreshTabs(SashWindowsContainer.java:384) at org.eclipse.papyrus.sasheditor.editor.AbstractMultiPageSashEditor.refreshTabs(AbstractMultiPageSashEditor.java:171) at org.eclipse.papyrus.core.editor.CoreMultiDiagramEditor.access$5(CoreMultiDiagramEditor.java:1) at org.eclipse.papyrus.core.editor.CoreMultiDiagramEditor$3.contentChanged(CoreMultiDiagramEditor.java:198) at org.eclipse.papyrus.sasheditor.contentprovider.di.internal.ContentChangedEventProvider.fireContentChanged(ContentChangedEventProvider.java:162) at org.eclipse.papyrus.sasheditor.contentprovider.di.internal.ContentChangedEventProvider$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.workspace.EMFCommandOperation.doExecute(EMFCommandOperation.java:119) at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150) at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:513) at org.eclipse.emf.workspace.impl.WorkspaceCommandStackImpl.doExecute(WorkspaceCommandStackImpl.java:208) 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.modelexplorer.listener.DoubleClickListener.doubleClick(DoubleClickListener.java:55) at org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:845) 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:843) at org.eclipse.jface.viewers.AbstractTreeViewer.handleDoubleSelect(AbstractTreeViewer.java:1462) at org.eclipse.ui.navigator.CommonViewer.handleDoubleSelect(CommonViewer.java:454) at org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1246) at org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:249) at org.eclipse.jface.util.OpenStrategy.access$0(OpenStrategy.java:246) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:307) 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: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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Fixed in r8444. The fix will only prevent diagram corruption, but there's a deeper problem here. When trying to create an Association Class (And maybe also an Association) between an Association and a Class, there are a few exceptions. The command will be reverted, and the diagram won't be corrupted. However, when you retarget an existing association/associationClass' end to an Association, the command will be executed ; and you won't be able to open your diagram afterwards. We should determine whether this should be allowed or not. It seems valid according to the UML specification, as an Association is actually a Classifier ; but it still seems strange. Anyway, the diagram should not be corrupted anymore, now.
> However, when you retarget an existing association/associationClass' end to an Association, the command will be executed ; and you won't be able to open your diagram afterwards. We should determine whether this should be allowed or not. It seems valid according to the UML specification, as an Association is actually a Classifier ; but it still seems strange. This now works as expected in the latest version of Papyrus. I close this task.
