NPE when inserting through rule (object already present as derived class) ------------------------------------------------------------------------- Key: DROOLS-107 URL: https://issues.jboss.org/browse/DROOLS-107 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.5.0.Final Environment: % java -version java version "1.7.0_21" Java(TM) SE Runtime Environment (build 1.7.0_21-b11) Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode) % uname -a Linux oem-laptop 3.5.0-28-generic #47-Ubuntu SMP Tue Apr 9 19:03:54 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Reporter: Jean-Marc Vanel Assignee: Mark Proctor NPE : unit test which depends only on 3 non Drools simple classes : Assignment, Triple, TripleUser unit test has 2 rules , 5 inserts, 3 fireAllRules : the last one makes the NPE. TestDroolsNPE.testRunRulesBefore testRunRulesBefore(eulergui.project.TestDroolsNPE) Exception executing consequence for rule "project-java-rules2.n3 0" in project_java_rules2_n3_1: java.lang.NullPointerException at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230) at eulergui.project.TestDroolsNPE.testRunRulesBefore(TestDroolsNPE.java:110) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at junit.framework.TestCase.runTest(TestCase.java:176) at junit.framework.TestCase.runBare(TestCase.java:141) at junit.framework.TestResult$1.protect(TestResult.java:122) at junit.framework.TestResult.runProtected(TestResult.java:142) at junit.framework.TestResult.run(TestResult.java:125) at junit.framework.TestCase.run(TestCase.java:129) at junit.framework.TestSuite.runTest(TestSuite.java:255) at junit.framework.TestSuite.run(TestSuite.java:250) at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:84) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.NullPointerException at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:196) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903) at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:245) at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:210) at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:205) at project_java_rules2_n3_1.Rule_project_java_rules2_n3_0_dd5596b676034b1fb5b32877015997e3.defaultConsequence(Rule_project_java_rules2_n3_0_dd5596b676034b1fb5b32877015997e3.java:12) at project_java_rules2_n3_1.Rule_project_java_rules2_n3_0_dd5596b676034b1fb5b32877015997e3DefaultConsequenceInvokerGenerated.evaluate(Unknown Source) at project_java_rules2_n3_1.Rule_project_java_rules2_n3_0_dd5596b676034b1fb5b32877015997e3DefaultConsequenceInvoker.evaluate(Unknown Source) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287) ... 25 more in class NamedEntryPoint : protected FactHandle insert(final Object object, final Object tmsValue, final boolean dynamic, boolean logical, final Rule rule, final Activation activation) throws FactException { if ( object == null ) { // you cannot assert a null object return null; } try { this.wm.startOperation(); ObjectTypeConf typeConf = this.typeConfReg.getObjectTypeConf( this.entryPoint, object ); if ( logical && !typeConf.isTMSEnabled()) { enableTMS(object, typeConf); } InternalFactHandle handle = null; if ( this.wm.isSequential() ) { handle = createHandle( object, typeConf ); insert( handle, object, rule, activation, typeConf ); return handle; } try { this.lock.lock(); this.ruleBase.readLock(); // check if the object already exists in the WM handle = this.objectStore.getHandleForObject( object ); if ( typeConf.isTMSEnabled() ) { EqualityKey key; TruthMaintenanceSystem tms = wm.getTruthMaintenanceSystem(); if ( handle == null ) { // lets see if the object is already logical asserted key = tms.get( object ); } else { // Object is already asserted, so check and possibly correct its // status and then return the handle key = handle.getEqualityKey(); if ( key.getStatus() == EqualityKey.STATED ) { // key == null here !!!!!!!!!!!!!!!!!!! // conf.setAssertBehaviour( AssertBehaviour.EQUALITY ); when rule inserts Triple : <file:/home/jmv/src/eulergui-code/eulergui/test/import.n3p.n3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#Ontology> . that is already present, as a TripleUser extends Triple, but equals() and hashCode() are the same ; this object is both asserted and inferred as a Triple object