instance.signal() java.lang.NullPointerException

[shijimeng]

ProcessDefinition processDefinition =
 ProcessDefinition.parseXmlResource("leave.par/processdefinition.xml");

// Create an instance of the process definition.
ProcessInstance instance = new ProcessInstance(processDefinition);

Map map = new HashMap();

map.put("quantity","3");
instance.getContextInstance().addVariables(map);

// Move the process instance from its start state to the first state.
// The configured action should execute and the appropriate message
// should appear in the message process variable.
System.out.println(
 "Instance is in ((start)) state: "+
 instance.getRootToken().getNode().getName());
instance.signal();
System.out.println(
 "Instance is in ((manager audit)) state: "+
 instance.getRootToken().getNode().getName());

instance.signal("audit_nopass_end");

System.out.println(
 "Instance is in ((end)) state: "+
 instance.getRootToken().getNode().getName());

processdefinition.xml

 <start-state name="start">
 <task>
 <controller>
 <variable name="item" />
 <variable name="quantity" />
 <variable name="address" />
 </controller>
 </task>
 <transition name="manager_aduit_trans" to="manager audit"></transition>
 </start-state>

 <task-node name="manager audit">
 <task>
 <controller>
 <variable name="item" access="read" />
 <variable name="quantity" access="read" />
 <variable name="address" access="read" />
 <variable name="comment" />
 </controller>
 <timer duedate="20 seconds" repeat="10 seconds">
 <action name="class" class="com.bpm.oa.leave.ManagerAudit">
 </action>
 </timer>
 </task>
 <transition name="audit_nopass_end" to="end"></transition>
 <transition name="audit_pass_route" to="manager audit route"></transition>
 <event type="node-enter">
 <action name="class" class="com.bpm.oa.leave.ManagerAudit"></action>
 </event>
 <event type="node-leave">
 <action name="class" class="com.bpm.oa.leave.ManagerAudit"></action>
 </event>
 </task-node>
 ...........

if it exists in <task-node> ,this unittest happen a java.lang.NullPointerException in instance.signal().
if it doesn't exist ,this unittest happen a Exception in instance.signal("audit_nopass_end").
the output is Instance is in ((manager audit)) state: end;

[shijimeng]

if it exists task node in <task-node> ,this unittest happen a java.lang.NullPointerException in instance.signal().
if it doesn't exist task node in <task-node>,this unittest happen a Exception in instance.signal("audit_nopass_end").
the output is Instance is in ((manager audit)) state: end;