Re: [rules-dev] Drools Core Error?

Hi Nestor - that is a tough one. I have a suspicion this is related to another issue I have seen with deserliasation of rulebases when the MVEL JIT kicks in... (from that strack trace it isn't getting the TypeDeclaration back...) - its a stretch, but might be related to: https://jira.jboss.org/jira/browse/JBRULES-2253 As there are a few moving parts, if you could create a unit test that starts up a agent and shows this behaviour, that would be appreciated (confused about the interaction with entry points). Thanks, Michael. On Mon, Aug 31, 2009 at 8:38 PM, nestabur<nestabur(a)gmail.com> wrote: > > Any suggestions? I have my project in stand-by due to that problem ... > > Nestor > > > nestabur wrote: >> >> Does anyone tried to use the knowledgeAgent with statefulSessions? >> >> I've tried to configure my rule engine obtaining unexpected behaviour. >> >> I configure my statefulSession as follows: >> >> wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent >> >> .getKnowledgeBase()).ruleBase.newStatefulSession( >> (SessionConfiguration) sessionConf, env); >> ksession = new StatefulKnowledgeSessionImpl(wm, >> kagent.getKnowledgeBase()); >> >> And after updating the KnowledgeBase in the agent I update my ksession: >> >> wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent >> >> .getKnowledgeBase()).ruleBase); >> ksession = new StatefulKnowledgeSessionImpl(wm, >> kagent.getKnowledgeBase()); >> >> Without using entry-points this approach works as expected, but using them >> it fails after the first update throwing the error: >> >> Exception while processing message: java.lang.NullPointerException >> java.lang.NullPointerException >> at >> org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:54) >> at >> org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:79) >> at >> org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:66) >> at >> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109) >> at >> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80) >> at >> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28) >> >> Browsing the drools core code I found the line that was throwing the >> exception and tried to get the same result by implementing: >> >> if (!((InternalRuleBase) ((KnowledgeBaseImpl) >> ksession.getKnowledgeBase()).ruleBase) >> .getTypeDeclaration(fact.getClass()) == >> null) >> log.info (((InternalRuleBase) ((KnowledgeBaseImpl) >> ksession.getKnowledgeBase()).ruleBase) >> >> .getTypeDeclaration(fact.getClass()).getTimestampExtractor().toString()); >> >> after updating my ksession. The result was the same, again the same >> exception thrown but my logger wrote: >> 18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact >> field=myTimestampField] >> >> So I dont know why the core is throwing that exception, is that >> implementation correct?, any ideas? >> >> >> Thanks, >> >> Nestor >> > > -- > View this message in context: http://www.nabble.com/Drools-Core-Error--tp25188219p25221364.html > Sent from the drools - dev mailing list archive at Nabble.com. > > _______________________________________________ > rules-dev mailing list > rules-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-dev > -- Michael D Neale home: www.michaelneale.net blog: michaelneale.blogspot.com _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev