NullPointerException on JPAKnowledgeService.loadStatefulKnowledgeSession() when Collection is modified ------------------------------------------------------------------------------------------------------ Key: DROOLS-376 URL: https://issues.jboss.org/browse/DROOLS-376 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 6.0.0.Final Reporter: Toshiya Kobayashi Assignee: Mark Proctor - Using JPAKnowledgeService - Add two or more elements to Collection property which is referred by 'from' in a rule. {noformat} package org.drools.test import org.drools.compiler.Person import org.drools.compiler.Address rule rule1 when $p: Person($list : addresses) $a: Address(street == "y") from $list then $list.add( new Address("z") ); $list.add( new Address("w") ); end {noformat} - Call JPAKnowledgeService.loadStatefulKnowledgeSession() Then NullPointerException is thrown {noformat} 2013-12-12 18:03:31,329 [main] |org.drools.persistence.SingleSessionCommandService| WARN Could not commit session java.lang.RuntimeException: Unable to load session snapshot at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:88) ~[classes/:na] at org.drools.persistence.SingleSessionCommandService.initExistingKnowledgeSession(SingleSessionCommandService.java:264) ~[classes/:na] at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:196) ~[classes/:na] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [na:1.7.0_13] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) [na:1.7.0_13] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [na:1.7.0_13] at java.lang.reflect.Constructor.newInstance(Constructor.java:525) [na:1.7.0_13] at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:101) [classes/:na] at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.loadKieSession(KnowledgeStoreServiceImpl.java:84) [classes/:na] at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.loadKieSession(KnowledgeStoreServiceImpl.java:1) [classes/:na] at org.kie.internal.persistence.jpa.JPAKnowledgeService.loadStatefulKnowledgeSession(JPAKnowledgeService.java:130) [kie-internal-6.1.0-SNAPSHOT.jar:6.1.0-SNAPSHOT] at org.drools.persistence.session.JpaPersistentStatefulSessionTest.testFromNodeWithModifiedCollection(JpaPersistentStatefulSessionTest.java:562) [test-classes/:na] ... Caused by: java.lang.NullPointerException: null at org.drools.core.reteoo.FromNode.createRightTuple(FromNode.java:152) ~[classes/:na] at org.drools.core.phreak.PhreakFromNode.doLeftInserts(PhreakFromNode.java:96) ~[classes/:na] at org.drools.core.phreak.PhreakFromNode.doNode(PhreakFromNode.java:49) ~[classes/:na] at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:348) ~[classes/:na] at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161) ~[classes/:na] at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116) ~[classes/:na] at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:200) ~[classes/:na] at org.drools.core.marshalling.impl.ProtobufInputMarshaller$PBActivationsFilter.fireRNEAs(ProtobufInputMarshaller.java:813) ~[classes/:na] at org.drools.core.reteoo.LeftInputAdapterNode.doInsertObject(LeftInputAdapterNode.java:258) ~[classes/:na] at org.drools.core.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:199) ~[classes/:na] at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:60) ~[classes/:na] at org.drools.core.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:288) ~[classes/:na] at org.drools.core.reteoo.EntryPointNode.assertObject(EntryPointNode.java:260) ~[classes/:na] at org.drools.core.marshalling.impl.ProtobufInputMarshaller.assertHandleIntoOTN(ProtobufInputMarshaller.java:499) ~[classes/:na] at org.drools.core.marshalling.impl.ProtobufInputMarshaller.readFactHandles(ProtobufInputMarshaller.java:476) ~[classes/:na] at org.drools.core.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:250) ~[classes/:na] at org.drools.core.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:157) ~[classes/:na] at org.drools.core.marshalling.impl.ProtobufMarshaller.unmarshall(ProtobufMarshaller.java:116) ~[classes/:na] at org.drools.core.marshalling.impl.ProtobufMarshaller.unmarshall(ProtobufMarshaller.java:1) ~[classes/:na] at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:83) ~[classes/:na] {noformat}