[gef-dev] Help: Error , thread with GEF

["ricky" <riky2008@xxxxxxxxxxx>]

Can someone help me, if I use Thread, in order to
move the Figure from GEF , but unfortunately with me
always return errors, if I Thread with start() start
(es is hier unbelievably , wenn with run(), then no problem, but that is not Thread),
 following errors message:


Exception in thread "Thread-5" java.lang.NullPointerException
 at
org.eclipse.draw2d.DeferredUpdateManager.queueWork(DeferredUpdateManager.java:174)
 at
org.eclipse.draw2d.DeferredUpdateManager.addInvalidFigure(DeferredUpdateManager.java:117)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1351)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.revalidate(Figure.java:1353)
 at org.eclipse.draw2d.Figure.setConstraint(Figure.java:1464)
 at
org.eclipse.gef.editparts.AbstractGraphicalEditPart.setLayoutConstraint(AbstractGraphicalEditPart.java:789)
 at com.test.subject.parts.ShapePart.refreshVisuals(ShapePart.java:95)
 at com.test.subject.parts.NodePart.propertyChange(NodePart.java:40)
 at com.test.subject.parts.ShapePart.propertyChange(ShapePart.java:118)
 at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
 at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
 at com.test.subject.model.Element.firePropertyChange(Element.java:21)
 at com.test.subject.model.StateShape.setName(StateShape.java:66)
 at com.test.subject.trace.RobotTrace.run(RobotTrace.java:310)
 at java.lang.Thread.run(Unknown Source)

here ist code  this method, which I think, error:
protected void refreshVisuals() {

  Rectangle bounds = new Rectangle(getCastedModel().getLocation(),
    getCastedModel().getSize());
  createFigureForModel();

  if(getFigure()!=null && ((GraphicalEditPart) getParent())!=null
    && bounds !=null && this != null)
  ((GraphicalEditPart) getParent()).setLayoutConstraint(this,
    getFigure(), bounds);

 }