how to trigger the Compensation Boundary Event in the task? thanks

[harlin-none]

xml:

<serviceTask id="servicetask1" name="Service Task1" activiti:class="com.lin.activiti.delegate.ExceptionDelegate" />
        <boundaryEvent id="compensateEvent" attachedToRef="servicetask1" cancelActivity="true">
   <compensateEventDefinition></compensateEventDefinition>
</boundaryEvent>
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[jbarrez]

Not sure what's your question is here? The compensation boundary event is dicussed here: http://activiti.org/userguide/index.html#bpmnBoundaryCompensationEvent