alfresco-community-repo/source/test-resources/jbpmresources/test_exception.xml

<?xml version="1.0" encoding="UTF-8"?>

<process-definition xmlns="urn:jbpm.org:jpdl-3.1" name="test_exception">

    <start-state name="start">
       <task name="bpm:startTask" swimlane="initiator" />
       <transition to="raiseerror"/>
    </start-state>

    <swimlane name="assignee">
        <assignment class="org.alfresco.repo.workflow.jbpm.AlfrescoAssignment">
           <actor>#{bpm_assignee}</actor>
        </assignment>
    </swimlane>

    <task-node name="raiseerror">
        <task name="wf:workflowTask" swimlane="assignee">
           <event type="task-end">
            <script>
               <variable name="submitexception" access="write"/>
               <expression>submitexception = false;</expression>
            </script>
              <script>
                 //raise exception!
              </script>
           </event>
        </task>
        <transition name="" to="checkexception">
        </transition>
            <exception-handler>
	           <script>
	              <variable name="submitexception" access="write"/>
	              <expression>
	               System.out.println("Exception");
	               submitexception = true
	              </expression>
	           </script>
        </exception-handler>
    </task-node>

    <decision name="checkexception">
        <event type="node-enter">
           <script>System.out.println("Value = " + submitexception);</script>
        </event>
        <transition name="failure" to="error">
           <condition>#{submitexception == true}</condition>
        </transition>
        <transition name="success" to="end">
           <condition>#{submitexception == false}</condition>
        </transition>
    </decision>

    <task-node name="error">
        <task name="wf:workflowTask" swimlane="assignee"/>
        <transition name="" to="end"/>
    </task-node>

    <end-state name="end"/>

</process-definition>