[rules-users] Drools and Persistence Example

[KiranP]

Dear all,
I got the example from 
http://blog.athico.com/2009/09/drools-flow-variable-persistence.html
http://blog.athico.com/2009/09/drools-flow-variable-persistence.html 

I understood the code ( as i m a fresher at drools as well as JPA it took
some time)
but still the code shows that how variables and state of process are
persisted but i want to know in case a sever fails then how the recovery
will take place....

i had an idea that the process-restart(using
loadStatefulKnowledgeSession(ID)) will trigger and load all sessions present
in the DB and so i tried it and restarted the session but i could not load
the workitems and the variables thus got an null pointer exception

the sample code uses the existing variable in code for processInstance and
workItem to get their ID(xyz.getId()) which wouldnt work in case of server
crash

Also if There are some (e)books on drools 5.1 then please provide more info
on them

any help in the form of examples is very welcome
thanks in advance.....

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