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1. Select child feature (i.e. Class attribute, operation, reference) from parent EClass. 2. Drag it as if to reorder elements. In some case, I get the exception below. More often, the UI simply freezes completely. If I select two items and then attempt to drag them, the UI always freezes. I'm not seeing anything on System console. Puzzled why no-one else has encountered/reported this issue. But I'm pretty sure it showed up on new install of Indigo SR1 with modeling components. java.lang.NullPointerException at org.eclipse.emf.ecore.impl.EClassImpl.getFeatureID(EClassImpl.java:1466) at org.eclipse.emf.ecore.util.BasicExtendedMetaData.getAffiliation(BasicExtendedMetaData.java:1339) at org.eclipse.emf.edit.command.SetCommand.prepare(SetCommand.java:525) at org.eclipse.emf.common.command.AbstractCommand.canExecute(AbstractCommand.java:114) at org.eclipse.emf.edit.command.AbstractOverrideableCommand.doCanExecute(AbstractOverrideableCommand.java:120) at org.eclipse.emf.edit.command.AbstractOverrideableCommand.canExecute(AbstractOverrideableCommand.java:113) at org.eclipse.emf.edit.command.DragAndDropCommand.prepareDropLinkOn(DragAndDropCommand.java:801) at org.eclipse.emf.edit.command.DragAndDropCommand.prepareDropOn(DragAndDropCommand.java:707) at org.eclipse.emf.edit.command.DragAndDropCommand.prepare(DragAndDropCommand.java:307) at org.eclipse.emf.common.command.AbstractCommand.canExecute(AbstractCommand.java:114) at org.eclipse.emf.edit.ui.dnd.EditingDomainViewerDropAdapter.drop(EditingDomainViewerDropAdapter.java:230) at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:90) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4128) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270) at org.eclipse.swt.dnd.DropTarget.drop(DropTarget.java:726) at org.eclipse.swt.dnd.DropTarget.outlineView_acceptDrop_item_childIndex(DropTarget.java:744) at org.eclipse.swt.dnd.DropTarget.dropTargetProc(DropTarget.java:469) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.dnd.DropTarget.dndCallSuper(DropTarget.java:208) at org.eclipse.swt.dnd.DropTarget.performDragOperation(DropTarget.java:737) at org.eclipse.swt.dnd.DropTarget.dropTargetProc(DropTarget.java:454) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:220) at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1092) at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2052) at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1084) at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2519) at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2007) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5471) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:220) at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2092) at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2252) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5535) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:4989) at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5138) at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method) at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3610) 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:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) 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)
I can confirm that this issue is introduced in EMF 2.7.1. Down-grading to 2.7.0 makes the problem go away, and re-installing brings it back. There seems to be something funky going on with the selection behavior. In the new version when I select an item and drag it it seems that the drag target item (i.e. insertion point) is selected as well.
Yes, it's a regression. :-( *** This bug has been marked as a duplicate of bug 359043 ***
