[jboss-jira] [JBoss JIRA] (JBRULES-3604) Updating a fact causes NPE with extends

[Bobby Graham (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-3604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bobby Graham updated JBRULES-3604:
----------------------------------

    Attachment: inheritance.drl

    
> Updating a fact causes NPE with extends
> ---------------------------------------
>
>                 Key: JBRULES-3604
>                 URL: https://issues.jboss.org/browse/JBRULES-3604
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core  (expert)
>    Affects Versions: 5.4.0.Final
>            Reporter: Bobby Graham
>            Assignee: Mark Proctor
>         Attachments: ExternalUpdateInheritanceTest.java, inheritance.drl
>
>
> Problem: When there are two rules (A and B) such that B extends A and both A and B reference the same fact in their conditions, calling update on that fact after calling fireAllRules causes a NPE.
> DRL:
> {code}
> package inheritance
> import org.drools.Address
> rule "Parent"
> 	enabled false
> 	when
> 		Address(suburb == "xyz")
> 	then
> 	
> end
> rule "Child" extends "Parent"
> 	when
> 		$addy:Address(street == "123 some street")
> 		
> 	then
> 		System.out.println($addy);
> end
> {code}
> Test:
> {code}
> package org.drools.testframework;
> import org.drools.Address;
> import org.drools.KnowledgeBase;
> import org.drools.KnowledgeBaseFactory;
> import org.drools.builder.KnowledgeBuilder;
> import org.drools.builder.KnowledgeBuilderFactory;
> import org.drools.builder.ResourceType;
> import org.drools.io.Resource;
> import org.drools.io.ResourceFactory;
> import org.drools.runtime.StatefulKnowledgeSession;
> import org.drools.runtime.rule.FactHandle;
> import org.junit.Test;
> public class ExternalUpdateInheritanceTest {
> 	@Test
> 	public void testExternalInheritanceFactUpdates() {
> 		KnowledgeBase knowledgeBase = null;
> 		KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder();
> 		Resource newClassPathResource = ResourceFactory.newClassPathResource("org/drools/lang/inheritance.drl");
> 		builder.add(newClassPathResource, ResourceType.DRL);
> 		if (builder.hasErrors()) {
> 			throw new RuntimeException(builder.getErrors().toString());
> 		}
> 		knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();
> 		knowledgeBase.addKnowledgePackages(builder.getKnowledgePackages());
> 		
> 		StatefulKnowledgeSession ksession = knowledgeBase.newStatefulKnowledgeSession();
> 		
> 		Address address = new Address();
> 		
> 		address.setSuburb("xyz");
> 		FactHandle addressHandle = ksession.insert(address);
> 		
> 		int rulesFired = ksession.fireAllRules();
> 		
> 		address.setStreet("123 some street");
> 		
> 		
> 		ksession.update(addressHandle, address);
> 		
> 		System.out.println(rulesFired);
> 	}
> }
> {code}
> Stack Trace:
> java.lang.NullPointerException
> 	at org.drools.common.DefaultAgenda.createActivation(DefaultAgenda.java:572)
> 	at org.drools.reteoo.RuleTerminalNode.modifyLeftTuple(RuleTerminalNode.java:297)
> 	at org.drools.reteoo.LeftTupleSource.doModifyLeftTuple(LeftTupleSource.java:297)
> 	at org.drools.reteoo.AbstractTerminalNode.modifyLeftTuple(AbstractTerminalNode.java:104)
> 	at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateModifyLeftTuple(SingleLeftTupleSinkAdapter.java:205)
> 	at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyObject(SingleLeftTupleSinkAdapter.java:235)
> 	at org.drools.reteoo.LeftInputAdapterNode.modifyObject(LeftInputAdapterNode.java:170)
> 	at org.drools.reteoo.SingleObjectSinkAdapter.propagateModifyObject(SingleObjectSinkAdapter.java:68)
> 	at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:157)
> 	at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
> 	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:421)
> 	at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:314)
> 	at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:265)
> 	at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:474)
> 	at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:960)
> 	at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:933)
> 	at org.drools.impl.StatefulKnowledgeSessionImpl.update(StatefulKnowledgeSessionImpl.java:284)
> 	at org.drools.testframework.ExternalUpdateInheritanceTest.testExternalInheritanceFactUpdates(ExternalUpdateInheritanceTest.java:44)

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