Re: [rules-users] AfterEvaluatorDefinition NullPointer Exception in deserialized ksession

Hey Alexander, Would this be related to this? https://issues.jboss.org/browse/DROOLS-243 If it is this one, you can do something like this as a workaround before constructing the KBase: Operator op = BeforeEvaluatorDefinition.BEFORE; Operator op = AfterEvaluatorDefinition.AFTER; This will cause the evaluation definition to be put in memory. Hope this helps! Demian On Fri, Oct 11, 2013 at 9:21 AM, Alexander Wolf <mail(a)alexander-wolf.net&gt; wrote: [Drools 5.5.0 Final] I wrote a webserver that keeps StatefulKnowledgeSessions running in Stream mode. When the server is stopped, the sessions are serialized and stored in a database. When the server is restarted, the existing sessions are restored / deserialized. Some time after recreating the session and inserting some events I get the following exception: java.lang.NullPointerException: null at org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedLeft(AfterEvaluatorDefinition.java:351) ... Apparently the exception seems to be related to a rule that uses temporal reasoning. After getting it once, the session seems to be corrupt -> from now on every time I call ksession.insert(event) the same exception occurs. When I serialize the session and attempt to deserialize it, I get a long stack trace --> I can not deserialize it anymore. (as apparently it is corrupted). When I run the server with the same events/sessions without stopping (serialization/deserialization) the exception does not occur) Can I do anything to prevent this behaviour? I thought maybe the "after" timer/trigger is somehow still active when I serialize the ksession. I tried ksession.halt() before serialization, but with no effect. Any ideas? _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users