how can get process instance's task node out transition

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ant1

ls there some API for get the process instance's an task node  out transition?
following list my step:
1. get the task by login user;
2. get the process instance id ;
3. use runtimeService to get the ProcessInstance by process instance id;
4. cast the ProcessInstance to ExecutionEntity;
5. call the getActivity() method to get PvmActivity;
6. call the getOutgoingTransitions() method to get the out transition;
but in the step 5 throw a nullpointException;

someone can tell me what's the problem in my step? or there is other way to get a task node's out transition?

thanks very much.

ant1

there is the code:

<br>&nbsp; List<Task> tList = taskService.createTaskQuery().taskAssignee("person1").list();<br>&nbsp; if (null != tList && tList.size() > 0) {<br>&nbsp;&nbsp;&nbsp; for (Task task : tList) {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println("the task id is :" + task.getId());<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println(task.getProcessInstanceId());<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; List<ProcessInstance> pdes = runtimeService.createProcessInstanceQuery().processInstanceId(task.getProcessInstanceId()).list();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (null != pdes && pdes.size() > 0) {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for (ProcessInstance pi : pdes) {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (null != pi) {<br>&nbsp; ExecutionEntity ee = (ExecutionEntity) pi;<br>&nbsp; if (null != ee) {<br>&nbsp;&nbsp;&nbsp; ActivityImpl ai = ee.getActivity();<br>&nbsp;&nbsp;&nbsp; List<PvmTransition> pts = ai.getOutgoingTransitions();<br>&nbsp;&nbsp;&nbsp; if (null != pts)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println(pts.size());<br>&nbsp;&nbsp;&nbsp; else<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println("PvmTransition list is null");<br>&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; }<br>