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Steps to reproduce: Create a class and some nested classes. Try to drop from the model explorer one of the nested classes inside the parent class. There is an unhandled event loop exception: java.lang.NullPointerException at org.eclipse.papyrus.diagram.composite.custom.helper.TypeHelper.dropTypeAsTypedProperty(TypeHelper.java:72) at org.eclipse.papyrus.diagram.composite.custom.edit.policies.CustomDiagramDragDropEditPolicy.getDropObjectsCommand(CustomDiagramDragDropEditPolicy.java:822) at org.eclipse.gmf.runtime.diagram.ui.editpolicies.DragDropEditPolicy.getCommand(DragDropEditPolicy.java:80) 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.gef.dnd.AbstractTransferDropTargetListener.getCommand(AbstractTransferDropTargetListener.java:215) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramDropTargetListener.isEnabled(DiagramDropTargetListener.java:224) at org.eclipse.jface.util.DelegatingDropAdapter.updateCurrentListener(DelegatingDropAdapter.java:365) at org.eclipse.jface.util.DelegatingDropAdapter.dragOver(DelegatingDropAdapter.java:182) at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:80) 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.Widget.sendEvent(Widget.java:1077) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774) at org.eclipse.swt.dnd.DropTarget.DragOver(DropTarget.java:366) at org.eclipse.swt.dnd.DropTarget$3.method4(DropTarget.java:250) at org.eclipse.swt.internal.ole.win32.COMObject.callback4(COMObject.java:101) at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method) at org.eclipse.swt.dnd.DragSource.drag(DragSource.java:363) at org.eclipse.swt.dnd.DragSource.access$0(DragSource.java:289) at org.eclipse.swt.dnd.DragSource$1.handleEvent(DragSource.java:172) 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:4066) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657) 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)
Already corrected. Note : drop a nestedClassifier build a Property!
This still occurs in case the diagram is created in a Class context.
Fixed in r3319.
