thanks,i have find the causation of the error!
public class Transition extends GraphElement {
| ......
| public Node getTo() {
| return to;
| }
| ......
| }
public class ProcessDefinition extends GraphElement implements NodeCollection {
| public Node getNode(String name) {
| if (nodes==null) return null;
| return (Node) getNodesMap().get(name);
| }
| }
the define is different between Transition.getTo() and
ProcessDefinition.getNode().
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