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

[Michael Neale (JIRA)]

NPE after knowledgebase updated when using entrypoints
------------------------------------------------------

                 Key: JBRULES-2278
                 URL: https://jira.jboss.org/jira/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: 5.1.0.M1


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

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