Re: [rules-users] threw error java.lang.ClassCastException: org.drools.reteoo.FromNode$FromMemory cannot be cast to org.drools.reteoo.BetaMemory
Ok, more pieces in the puzzle :). I still do not understand why you are
getting lock/unlock on insertions.
In 5.5.1-SNAPSHOT and 5.6.0-SNAPSHOT, those events are fired only when a
WRITE lock is acquired
to modify the RETE. Insertions and fireAllRules use READ locks that do
not generate that kind of events.
Are you getting them even when you run the rules in Eclipse?
Notice that WRITE locks are also acquired when STATELESS sessions are
used, rather than STATEFUL ones,
(which btw was dcrissman's case)... but you are using STATEFUL sessions,
so this shouldn't be the case, right?
Otherwise, I'd really like to know why the lock is acquired... I would
go as afar as forcing a controlled exception
in the KBEventListener to see the stack trace during one of those
insertions.
(So far, I have assumed that the "maintenance" actions on the KB are not
triggered by the rules themselves,
but by some other control module)
Davide
On 05/09/2013 05:44 AM, mohdejaz74 wrote:
knowledge-api-5.5.0.Final.jar
knowledge-internal-api-5.5.0.Final.jar
drools-compiler-5.5.1-SNAPSHOT.jar
drools-core-5.5.1-SNAPSHOT.jar
4 times kb unlock/unlock is due to 4 objects inserted into session. After
5th insert it crashes. 5 objects are always inserted into session before
fireAllRules is invoked. It does'nt crash if no rule is added/updated.
RuleRunner inserts them - 5th object is the actual model object against
which all rules are run
http-8084-2 and 2967417 are same; i just rename thread once I've serialized
the model object to take the id.
I've noticed that the four times lock/unlock happens immediately after KB is
modified (ie. rule is removed and added).
General flow of RuleRunner is ...
read xml payload from HttpServletRequest
create model object from xml
set thread name to model.id
get lock on kba (kba is my wrapper class to control access to kb)
get stateful session
session.insert( obj1 )
session.insert( obj2 )
session.insert( obj3 )
session.insert( obj4 )
fact_handle = session.insert( model )
iterate through a list of agenda and set focus to agenda
sesssion.fireAllRules()
retract fact_handle from session
dispose session
release lock on kba
Ejaz
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