Kris Verlaenen [http://community.jboss.org/people/KrisVerlaenen] created the 
discussion

"Re: What happens if the TaskServer is shutdown between Created and Complete 
states?"

To view the discussion, visit: http://community.jboss.org/message/598247#598247

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The engine registers itself to the task service when you initialize your 
WSHumanTaskHandler.  Assume you need to recreated your session and task service 
(for example due to failure), the state of your process instances and of your 
human tasks are persisted in the session and task service respectively.  So you 
can restore them from database.  When reconnecting the session to the task 
service, the listener will also be restored.

There used to be an issue where there was one listener for each requested 
task.  The fix as applied in JBRules-2002 now uses a generic listener for all 
tasks.  This is also how it works in jBPM 5.0.

Note that the task handler usually only lazily connects to the task service (so 
the first time the session tries to create a task).  To make sure you connect 
immediately (so you can retrieve task completion events even before the first 
task is created), do handler.connect() after registering it.  This will 
instantiate the listener.

Kris
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