[rules-users] Using KnowledgeAgent with loadStatefulKnowledgeSession?

[dunnlow]

Hello, I am using jBPM 5.4 with persistence and have long running processes
and make make changes to the knowledge base periodically (via drools guvnor
5.5). I use JPAKnowlegeService.loadStatefulKnowledgeSession(...) to retrieve
my existing knowledge session.  When I make a change to the rule base (via
drools 5.5 guvnor) and then try to restart my application (and reload the
knowledgesession) I get an exception:

java.lang.RuntimeException: Unable to load session snapshot
     at
org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:96)
.
.
Caused by: java.lang.NullPointerException
    at
org.drools.common.Scheduler$activationTimerInputMarshaller.deserialize(Scheduler.java:230)

I am NOT currently using a KnowledgeAgent and it seems like it should be
able to help.  I have read over the drools forum and this one and see a few
discussions on the topic (https://community.jboss.org/thread/172818) but
nothing concrete to put me on the right path.

The examples with knowledgeagent I have found assume that I am calling:
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

Can someone please show/explain how I can reload an existing persisted
knowledgesession given changes in my knowledge base?  (for example, can the
knowledgeagent and JPAKnowlegeService.loadStatefulKnowledgeSession be used
together?  If not, do I load the existing statefulknowledgesession by some
other means?)

I am using Spring-based configuration.  Thanks for any insight.

-J



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