[jboss-jira] [JBoss JIRA] Resolved: (JBRULES-2278) NPE after knowledgebase updated when using entrypoints

NPE after knowledgebase updated when using entrypoints ------------------------------------------------------ Key: JBRULES-2278 URL: https://issues.jboss.org/browse/JBRULES-2278 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Components: drools-core, drools-core (expert), drools-core (fusion) Affects Versions: 5.0.1.FINAL Reporter: Michael Neale Assignee: Edson Tirelli Fix For: 5.2.0.CR1 Attachments: kagent-problem-dynamic-facts.zip, kagent-problem.zip Raised by Nestor Burriel on the dev list: 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