"kazam" wrote : 
  | My perhaps silly question is that why isn't async used for Tasks, I have 
used Oracle BPEL Workflow before and Tasks response or completion used to be 
asynchronous having a callback association in the process when the Task was 
completed. 

Simple, jBPM has (human) task functionality by default. Oracle had to make a 
proprietary extension to BPEL to achieve the same. So tasks are already 'async'

"kazam" wrote : 
  | My other question is that under JBPM, I am not entirely clear as what 
Client thread [Is it JBPM thread ? ]and the server thread[ Is it DBMS Thread 
for transaction processing ? ] means, this terminology has been used in the 
JBPM Documentation. 

Could you elaborate on this? Besides the async continuations, jBPM runs in the 
client thread (e.g. the webapp, fat client or whatever). It is a library, not a 
full separate server

"kazam" wrote : 
  | Also, under what scenarios or examples would this piece of functionality 
might come in handy. 

Async conituations? Mainly in the case of long running automated actions which 
you do not want to block a thread, transaction etc.

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