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Null Pointer Exception during drag and drop in emf editor: appeared in 2.7 [message #736286]

Thu, 13 October 2011 15:33

Eclipse User

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Hi, 
 
I have a very strange bug in EMF with Eclipse 3.7.1 which was not
before in version 3.6. 
 
When I try to do a move of one node in my EMF based editor, I get a
null pointer exception. 
 
<img src="http://www.eclipse.org/forums/index.php?t=getfile&id=4287" alt=""> 
 
I have absolutely no exception from my custom packages, so I would
like to know if any of you have the same problem. Same exception
appears with the generic editor generated by EMF since the null
pointer is really embedded into the EClassImpl 
 
 
Below is the stack trace and EMF plugins versions: 
 
<img src="http://www.eclipse.org/forums/index.php?t=getfile&id=4288" alt=""> 
 
Any help will be greatly appreciated 
 
Mircea 
 
 
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.helper(EditingDomainViewerDropAdapter.java:324) 
    at
org.eclipse.emf.edit.ui.dnd.EditingDomainViewerDropAdapter.dragEnter(EditingDomainViewerDropAdapter.java:143) 
    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: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.DragEnter(DropTarget.java:297) 
    at org.eclipse.swt.dnd.DropTarget$3.method3(DropTarget.java:243) 
    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$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: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) 
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