I have been trying to get the previous transition to a node.
I did an action with does this:

 Transition t = executionContext.getTransition();
 String transition_name = t.getName();

 // Node n = executionContext.getTransitionSource();
 //String nodeName = n.getName();


And i get a null pointer exception.

Here is my process definition:
<?xml version="1.0" encoding="UTF-8"?>

<process-definition name="transition test">
 <swimlane name="demandeur">
 <assignment expression="user(mennen)"></assignment>
 </swimlane>


 <start-state name="start transition tests">
 <task swimlane="demandeur">
 <controller>
 <variable name="Date_demande" access="read"/>
 <variable name="transition" access="read"/>
 </controller>

 </task>
 <transition name="transition_1" to="task1"> </transition>
 </start-state>

 <end-state name="end1"></end-state>

 <task-node name="task1">
 <task swimlane="demandeur">
 <controller>
 <variable name="Date_demande" access="read"/>
 <variable name="transition" access="read"/>
 </controller>

 <event type="task-create">
 <script>
 <expression>
 Date today = new Date();
 executionContext.getContextInstance().setVariable("Date_demande",today);
 String t = executionContext.getTransition();
 // String t = executionContext.getTransitionSource().getName();
 executionContext.getContextInstance().setVariable("transition",t);
 </expression>
 </script>
 </event>

 </task>
 <transition name="transition_2" to="task2"></transition>
 </task-node>


 <task-node name="task2">
 <task swimlane="demandeur">
 <controller>
 <variable name="Date_demande" access="read"/>
 <variable name="transition" access="read"/>
 </controller>
 </task>
 <transition name="transition_3" to="end1"></transition>
 </task-node>


</process-definition>


Thanks in advance,