You initial assumption is wrong:

anonymous wrote : In my JBPM approval process, I have a requirement that, if at 
any point of time JBPM exception happens during the process work flow., the 
control should delegate to a separate TaskNode called Admin node,

Because as you state yourself, this contradicts the documentation:

anonymous wrote : Note that the exception handling mechanism of jBPM is not 
completely similar to the java exception handling. In
  | java, a caught exception can have an influence on the control flow. In the 
case of jBPM, control flow cannot be
  | changed by the jBPM exception handling mechanism.

So think out of the box. A JbpmException should be handled by the 
delegationclass in which it occurs. What you can try (never did this, only did 
escalation with timers) is to raise an event, catch this event in your task and 
in the delegationclass in the eventhandler move the *token* to the 
corresponding node and move it back to the originating task when the admin task 
should be ended.

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