设为子模型后，运行时，报，HelloModel cannot be cast to org.eclipse.gef.EditPart！请问这个什么原因？
java.lang.ClassCastException: com.ubisensing.model.NodeModel cannot be cast to org.eclipse.gef.EditPart
at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:230)
at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:212)
at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:195)
at org.eclipse.gef.editparts.ScalableRootEditPart.setContents(ScalableRootEditPart.java:404)
at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:583)
at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:592)
at com.ubisensing.ui.UbisensingEditor.initializeGraphicalViewer(UbisensingEditor.java:36)
当我只设置，NodeMode时，显示正常，只设置，ContentsModel时，也显示正常，但是当把NodeMode放ContentsModel里就，出现上面的异常了！
在ContensEditPart里我，重载了getChildren方法
public List getChildren() {
// TODO Auto-generated method stub
return ((ContentsModel)getModel()).getChildren();
}
在 DiagramEditor里，
protected void configureGraphicalViewer() {
// TODO Auto-generated method stub
super.configureGraphicalViewer();
viewer = getGraphicalViewer();
viewer.setEditPartFactory(new PartFactory());
}
protected void initializeGraphicalViewer() {
// TODO Auto-generated method stub
ContentsModel parent = new ContentsModel();
NodeModel node = new NodeModel();
parent.addChild(node);
viewer.setContents(parent); // 这一行报错
}
------解决方案--------------------
楼主~~~~~~~~~~~~~~~~~~~~~~~~~