[news.eclipse.tools.gef] Drag & Drop in GEF

["Sami Lakka" <sami.lakka@xxxxxx>]

Hello,

I'm trying to implement D&D functionality from package explorer to my GEF 
diagram. I'm following the article in :
http://www.eclipse.org/articles/Article-GEF-dnd/GEF-dnd.html and somehow I'm 
getting following exception when I'm dragging a file from package explorer 
to the diagram:

java.lang.NullPointerException
 at org.eclipse.swt.dnd.DropTarget.setEventData(DropTarget.java:628)
 at org.eclipse.swt.dnd.DropTarget.DragEnter(DropTarget.java:253)
 at org.eclipse.swt.dnd.DropTarget.access$4(DropTarget.java:247)
 at org.eclipse.swt.dnd.DropTarget$3.method3(DropTarget.java:233)
 at 
org.eclipse.swt.internal.ole.win32.COMObject.callback3(COMObject.java:90)
 at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method)
 at org.eclipse.swt.dnd.DragSource.drag(DragSource.java:277)
 at org.eclipse.swt.dnd.DragSource.access$0(DragSource.java:267)
 at org.eclipse.swt.dnd.DragSource$1.handleEvent(DragSource.java:161)
 at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
 at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
 at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3080)
 at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2713)
 at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
 at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
 at 
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
 at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
 at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
 at 
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
 at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
 at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
 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:324)
 at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
 at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
 at org.eclipse.core.launcher.Main.run(Main.java:973)
 at org.eclipse.core.launcher.Main.main(Main.java:948)

This exception comes immeaditely when the mouse enters the diagram area. 
What is going wrong?


Best Regards,
- Sami