[rules-users] PMML - Exception excuting consequence for rule xxx in yyy: java.lang.NullPointerException : using KnowledgeAgent

Hi. I'm trying to test pmml "decision trees" (https://github.com/droolsjbpm/drools-chance/tree/master/drools-pmml) on Drools 5.5.0.Final. The two test environment's outcome are not same. 1) I got a test on Eclipse. The results are fine. Test source is as below. public class PMMLTestFromLocal { public static final void main(String[] args) { try { KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "LocalPmmlTest"); FactType CHK_YN_Type = kbase.getFactType( "Meritz_ModelRule_01","CHK_YN" ); CHK_YN_Type.newInstance(); ksession.getWorkingMemoryEntryPoint( "in_AC_CSE_TYP_RE" ).insert( "group0" ); ksession.getWorkingMemoryEntryPoint( "in_AC_TYP_RE" ).insert( "Caution" ); ksession.getWorkingMemoryEntryPoint( "in_COV_CD_RE" ).insert( "group2" ); ksession.getWorkingMemoryEntryPoint( "in_AC_STAT_CD_RE" ).insert( "group1" ); ksession.getWorkingMemoryEntryPoint( "in_HDCAP_RATE_RE" ).insert( "0" ); ksession.getWorkingMemoryEntryPoint( "in_FDS_AC_YN" ).insert( "0" ); ksession.getWorkingMemoryEntryPoint( "in_AGE_GRD" ).insert( "10대" ); ksession.getWorkingMemoryEntryPoint( "in_AC_COT_DAY" ).insert( 0.0 ); ksession.fireAllRules(); logger.close(); } catch (Throwable t) { t.printStackTrace(); } } private static KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("pmml2.drl"), ResourceType.DRL); KnowledgeBuilderErrors errors = kbuilder.getErrors(); if (errors.size() > 0) { for (KnowledgeBuilderError error: errors) { System.err.println(error); } throw new IllegalArgumentException("Could not parse knowledge."); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase("Meritz"); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); return kbase; } } 2) The Second environment which is excuting Exception is Tomcat. I got a test using same drools engine on Tomcat. But NullpointerException occured. Test source is as below. public class PMMLTestFromServer { public static void main(String[] args) { StatefulKnowledgeSession kSession = getSKSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(kSession, "ServerPmmlTest"); SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd"); kSession.getWorkingMemoryEntryPoint( "in_AC_CSE_TYP_RE" ).insert( "group0" ); kSession.getWorkingMemoryEntryPoint( "in_AC_TYP_RE" ).insert( "Caution" ); kSession.getWorkingMemoryEntryPoint( "in_COV_CD_RE" ).insert( "group2" ); kSession.getWorkingMemoryEntryPoint( "in_AC_STAT_CD_RE" ).insert( "group1" ); kSession.getWorkingMemoryEntryPoint( "in_HDCAP_RATE_RE" ).insert( "0" ); kSession.getWorkingMemoryEntryPoint( "in_FDS_AC_YN" ).insert( "0" ); kSession.getWorkingMemoryEntryPoint( "in_AGE_GRD" ).insert( "10대" ); kSession.getWorkingMemoryEntryPoint( "in_AC_COT_DAY" ).insert( 0.0 ); kSession.fireAllRules(); logger.close(); } public static StatefulKnowledgeSession getSKSession() { KnowledgeAgent agent = KnowledgeAgentFactory.newKnowledgeAgent("Meritz"); agent.applyChangeSet(ResourceFactory.newClassPathResource("change-set_model.xml")); KnowledgeBase ruleBase = agent.getKnowledgeBase(); System.out.println(ruleBase.getKnowledgePackages()); return ruleBase.newStatefulKnowledgeSession(); } } The differences in two test source is using KnowledgeAgent. Exception stack trace follows - Exception executing consequence for rule "outputFeature_CHK_YN_to_Probability_N_probability" in Meritz_ModelRule_01: 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 com.meritzfis.test.PMMLTestFromServer.main(PMMLTestFromServer.java:43) Caused by: java.lang.NullPointerException at org.drools.base.evaluators.BeforeEvaluatorDefinition$BeforeEvaluator.evaluateCachedRight(BeforeEvaluatorDefinition.java:318) at org.drools.rule.constraint.EvaluatorConstraint.isAllowedCachedRight(EvaluatorConstraint.java:80) at org.drools.common.DoubleBetaConstraints.isAllowedCachedRight(DoubleBetaConstraints.java:97) at org.drools.reteoo.JoinNode.propagateFromRight(JoinNode.java:156) at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:148) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350) at org.drools.common.SimpleBeliefSystem.insert(SimpleBeliefSystem.java:38) at org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:204) at org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:176) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:231) 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 Meritz_ModelRule_01.Rule_outputFeature_CHK_YN_to_Probability_N_probability_a4a43fe942664fe0b31e45a29a6d99fc.defaultConsequence(Rule_outputFeature_CHK_YN_to_Probability_N_probability_a4a43fe942664fe0b31e45a29a6d99fc.java:14) at Meritz_ModelRule_01.Rule_outputFeature_CHK_YN_to_Probability_N_probability_a4a43fe942664fe0b31e45a29a6d99fcDefaultConsequenceInvokerGenerated.evaluate(Unknown Source) at Meritz_ModelRule_01.Rule_outputFeature_CHK_YN_to_Probability_N_probability_a4a43fe942664fe0b31e45a29a6d99fcDefaultConsequenceInvoker.evaluate(Unknown Source) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287) ... 6 more I'm attaching a drl file. -- View this message in context: http://drools.46999.n3.nabble.com/PMML-Exception-excuting-consequence-for... 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