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Steps to reproduce: 1. Create Requirement0 2. Create Requirement1 3. Create Requirement2 4. Create a decomposition relationship from Requirement0 to Requirement1 5. Create a decomposition relationship from Requirement0 to Requirement2 6. Click on Requirement0 7. Now you will have this error: Problems occurred when invoking code from plug-in: "org.eclipse.papyrus.sasheditor". java.lang.NullPointerException at org.eclipse.emf.transaction.util.TransactionUtil.getEditingDomain(TransactionUtil.java:61) at org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest.<init>(DestroyElementRequest.java:118) at org.eclipse.papyrus.diagram.clazz.edit.policies.ClassItemSemanticEditPolicy.addDestroyChildNodesCommand(ClassItemSemanticEditPolicy.java:250) at org.eclipse.papyrus.diagram.clazz.custom.policies.itemsemantic.CustomClassItemSemanticEditPolicy.getDestroyElementCommandGen(CustomClassItemSemanticEditPolicy.java:228) at org.eclipse.papyrus.diagram.clazz.custom.policies.itemsemantic.CustomClassItemSemanticEditPolicy.getDestroyElementCommand(CustomClassItemSemanticEditPolicy.java:243) at org.eclipse.papyrus.diagram.clazz.edit.policies.UMLBaseItemSemanticEditPolicy.getSemanticCommandSwitch(UMLBaseItemSemanticEditPolicy.java:693) at org.eclipse.papyrus.diagram.clazz.edit.policies.UMLBaseItemSemanticEditPolicy.getSemanticCommand(UMLBaseItemSemanticEditPolicy.java:673) at org.eclipse.gmf.runtime.diagram.ui.editpolicies.SemanticEditPolicy.getCommand(SemanticEditPolicy.java:69) at org.eclipse.papyrus.diagram.clazz.edit.policies.UMLBaseItemSemanticEditPolicy.getCommand(UMLBaseItemSemanticEditPolicy.java:545) at org.eclipse.gef.editparts.AbstractEditPart.getCommand(AbstractEditPart.java:501) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.access$1(GraphicalEditPart.java:1) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart$1.run(GraphicalEditPart.java:482) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.getCommand(GraphicalEditPart.java:477) at org.eclipse.papyrus.diagram.common.actions.DeleteFromModelAction.getCommand(DeleteFromModelAction.java:113) at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.getCommand(DiagramAction.java:161) at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.calculateEnabled(DiagramAction.java:124) at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.refresh(DiagramAction.java:114) at org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.selectionChanged(AbstractActionHandler.java:387) at org.eclipse.papyrus.sasheditor.internal.eclipsecopy.MultiPageSelectionProvider$1.run(MultiPageSelectionProvider.java:113) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.papyrus.sasheditor.internal.eclipsecopy.MultiPageSelectionProvider.fireEventChange(MultiPageSelectionProvider.java:110) at org.eclipse.papyrus.sasheditor.internal.eclipsecopy.MultiPageSelectionProvider.fireSelectionChanged(MultiPageSelectionProvider.java:92) at org.eclipse.papyrus.sasheditor.internal.eclipsecopy.MultiPageEditorSite.handleSelectionChanged(MultiPageEditorSite.java:463) at org.eclipse.papyrus.sasheditor.internal.eclipsecopy.MultiPageEditorSite$3.selectionChanged(MultiPageEditorSite.java:385) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer.flushSelectionEvents(DiagramGraphicalViewer.java:269) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer$1.run(DiagramGraphicalViewer.java:247) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2629) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2593) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2427) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:670) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:663) 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:1407) at org.eclipse.equinox.launcher.Main.main(Main.java:1383)
This bug originally relate to Class diagram (then transitively to Requirement diagram) : java.lang.NullPointerException at org.eclipse.emf.transaction.util.TransactionUtil.getEditingDomain(TransactionUtil.java:61) at org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest.<init>(DestroyElementRequest.java:118) at org.eclipse.papyrus.diagram.clazz.edit.policies.ClassItemSemanticEditPolicy.addDestroyChildNodesCommand(ClassItemSemanticEditPolicy.java:250) AFAIU the problem is caused not when selecting the class but when trying to delete it (the issue on selection probably a side effect). When creating the deletion command, the ClassItemSemanticEditPolicy tries to compose the command with command to delete children. On possible child is ContainmentCircleEditPart, which is associated to Port metamodel type in GMFGen model, but relates to no semantic element in reality... The generated code (in ClassItemSemanticEditPolicy) tries to create a semantic deletion command for ContainmentCircleEditPart which is not related to any semantic element and cause NPE during deletion command execution.
I cannot reproduce the issue in the current version; I close this task
