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It is not possible to drag&drop an exising transition onto a diagram.
A precision: it is possible to drag a transition into a diagram (with 0.8.x version), but dragging will also create the states associated with the transitions, even if these states already exist in the diagram. Thus, drag&drop of transition remains unusable (you cannot delete the existing states first, as the may be targeted by other transitions, for the same reason, you cannot delete the new ones later).
Droping a transition when the source and target state are displayed is ok. However, if the source or target state is not show, following error is raised: null Error Wed Mar 27 23:22:31 CET 2013 Unhandled event loop exception java.lang.ClassCastException: org.eclipse.uml2.uml.internal.impl.StateMachineImpl cannot be cast to org.eclipse.uml2.uml.Region at org.eclipse.papyrus.uml.diagram.statemachine.custom.policies.CustomStateMachineDiagramDragDropEditPolicy.dropTransition(CustomStateMachineDiagramDragDropEditPolicy.java:497) at org.eclipse.papyrus.uml.diagram.statemachine.custom.policies.CustomStateMachineDiagramDragDropEditPolicy.getSpecificDropCommand(CustomStateMachineDiagramDragDropEditPolicy.java:774) at org.eclipse.papyrus.uml.diagram.common.editpolicies.OldCommonDiagramDragDropEditPolicy.getDropObjectCommand(OldCommonDiagramDragDropEditPolicy.java:269) at org.eclipse.papyrus.uml.diagram.common.editpolicies.OldCommonDiagramDragDropEditPolicy.getDropObjectsCommand(OldCommonDiagramDragDropEditPolicy.java:241) at org.eclipse.gmf.runtime.diagram.ui.editpolicies.DragDropEditPolicy.getCommand(DragDropEditPolicy.java:80) at org.eclipse.papyrus.infra.gmfdiag.dnd.strategy.DefaultDropStrategy.getCommand(DefaultDropStrategy.java:74) at org.eclipse.papyrus.infra.gmfdiag.dnd.policy.CustomizableDropEditPolicy.findStrategies(CustomizableDropEditPolicy.java:290) at org.eclipse.papyrus.infra.gmfdiag.dnd.policy.CustomizableDropEditPolicy.getCustomCommand(CustomizableDropEditPolicy.java:211) at org.eclipse.papyrus.infra.gmfdiag.dnd.policy.CustomizableDropEditPolicy.getCommand(CustomizableDropEditPolicy.java:98) at org.eclipse.gef.editparts.AbstractEditPart.getCommand(AbstractEditPart.java:502) 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.dragEnter(DelegatingDropAdapter.java:128) at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:60) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:778) at org.eclipse.swt.dnd.DropTarget.DragEnter(DropTarget.java:297) at org.eclipse.swt.dnd.DropTarget.DragEnter_64(DropTarget.java:275) at org.eclipse.swt.dnd.DropTarget$3.method3(DropTarget.java:245) at org.eclipse.swt.internal.ole.win32.COMObject.callback3(COMObject.java:92) 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$000(DragSource.java:102) 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:1057) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1108) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:992) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:137) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:600) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:555) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124) 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:354) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181) 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:636) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591) at org.eclipse.equinox.launcher.Main.run(Main.java:1450) at org.eclipse.equinox.launcher.Main.main(Main.java:1426)
Fixed in revision 10770 of trunk and 10774 of 0.9.X revision
