[jboss-user] [JBoss jBPM] - Re: Error in node-->TaskNode

[harderwu]

thanks,kukeltje
i want to get the next tasknode("b") by  transition of the current node "a",
the ProcessDefinition:
 <start-state name="a">
  |        <transition name="tra to="b">
  |        </transition>
  |    </start-state>
  |    <task-node name="b">
  |       <task name="first">
  |          <assignment class="com.test.assignment.PartMaster" config-type="bean">
  |             <groupName>leader</groupName>
  |          </assignment>
  |               </task>
  |            <transition name="tra2" to="c">
  |                </transition>
  | </task-node>	
my code :
.....
  | (transition is the object of the "tra")
  | Node node=transition.getTo();
  | TaskNode tasknode = (TaskNode) node;	 
  | Task tptask = tasknode.getTask("first");
  |  PartMaster parma = (PartMaster) tptask.getAssignmentDelegation()
  | 			.getInstance();
  | String tpstr = parma.getGroupName();
my goal is  that i can get "leader" from the ProcessDefinition!but "ClassCastException" is Thrown in the second line,the description of ClassCastException:
/**
  |  * Thrown to indicate that the code has attempted to cast an object 
  |  * to a subclass of which it is not an instance. For example, the 
  |  * following code generates a <code>ClassCastException</code>: 
  |  * <p><blockquote><pre>
  |  *     Object x = new Integer(0);
  |  *     System.out.println((String)x);
  |  * </pre></blockquote>
  |  *
  |  * @author  unascribed
  |  * @version 1.20, 12/19/03
  |  * @since   JDK1.0
  |  */do you understand my description?thanks

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