[ https://issues.jboss.org/browse/DROOLS-1158?page=com.atlassian.jira.plugi... ] ti swei commented on DROOLS-1158: --------------------------------- Hi Matteo Mortari, I met same problem with Juan Carlos Garcia. My drools version is 6.5.0 Final. I tried to solve the problem, but I didn't succeed. Matteo Mortari, can you give me some help, the following is my exception message: java.lang.NullPointerException: null at org.drools.core.rule.constraint.MvelConstraint.equals(MvelConstraint.java:617) at org.drools.core.reteoo.AlphaNode.internalEquals(AlphaNode.java:200) at org.drools.core.common.BaseNode.thisNodeEquals(BaseNode.java:193) at org.drools.core.reteoo.SingleObjectSinkAdapter.getMatchingNode(SingleObjectSinkAdapter.java:136) at org.drools.core.reteoo.builder.BuildUtils.attachNode(BuildUtils.java:120) at org.drools.core.reteoo.builder.PatternBuilder.buildAlphaNodeChain(PatternBuilder.java:331) at org.drools.core.reteoo.builder.PatternBuilder.attachAlphaNodes(PatternBuilder.java:312) at org.drools.core.reteoo.builder.PatternBuilder.attachPattern(PatternBuilder.java:129) at org.drools.core.reteoo.builder.PatternBuilder.build(PatternBuilder.java:77) at org.drools.core.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:108) at org.drools.core.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:68) at org.drools.core.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:161) at org.drools.core.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:133) at org.drools.core.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:106) at org.drools.core.impl.KnowledgeBaseImpl.addRule(KnowledgeBaseImpl.java:1586) at org.drools.core.impl.KnowledgeBaseImpl.addRule(KnowledgeBaseImpl.java:1566) at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileAllRules(KnowledgeBuilderImpl.java:1004) at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildRules(CompositeKnowledgeBuilderImpl.java:264) at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackages(CompositeKnowledgeBuilderImpl.java:122) at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:105) at org.drools.compiler.kie.builder.impl.KieContainerImpl.rebuildAll(KieContainerImpl.java:449) at org.drools.compiler.kie.builder.impl.KieContainerImpl.updateKBase(KieContainerImpl.java:311) at org.drools.compiler.kie.builder.impl.KieContainerImpl.access$000(KieContainerImpl.java:88) at org.drools.compiler.kie.builder.impl.KieContainerImpl$1.run(KieContainerImpl.java:255) at org.drools.core.impl.KnowledgeBaseImpl.enqueueModification(KnowledgeBaseImpl.java:735) at org.drools.compiler.kie.builder.impl.KieContainerImpl.update(KieContainerImpl.java:252) at org.drools.compiler.kie.builder.impl.KieContainerImpl.updateToVersion(KieContainerImpl.java:196) at com.zte.vmaster.correlation.engine.manager.DroolsEngine.deployRule(DroolsEngine.java:274) my code is as follows : {code:java} public class DroolsEngineCode { private KieBase kieBase; private KieSession kieSession; private KieContainer kieContainer; private KieFileSystem kfs; private KieServices ks; private KieResources resources; private KieBuilder kieBuilder; private KieRepository kieRepository; private ReleaseId releaseId; @PreDestroy private void stop() { this.kieSession.dispose(); } @PostConstruct private void initEngineParameter() throws Exception { this.ks = KieServices.Factory.get(); this.resources = ks.getResources(); this.kieRepository = ks.getRepository(); this.releaseId = kieRepository.getDefaultReleaseId(); this.kfs = createKieFileSystemWithKProject(ks); this.kieBuilder = ks.newKieBuilder(kfs).buildAll(); this.kieContainer = ks.newKieContainer(this.releaseId); this.kieBase = kieContainer.getKieBase(); this.kieSession = kieContainer.newKieSession(); } public synchronized void deployRule(String ruleContent) throws Exception { if (JudgeNullUtil.isEmpty(ruleContent)) { throw new NullPointerException(); } StringReader reader = new StringReader(ruleContent); KieModule kieModule = createKieJar(ks, this.resources.newReaderResource(reader, "UTF-8") .setResourceType(ResourceType.DRL)); kieRepository.addKieModule(kieModule); kieContainer.updateToVersion(releaseId); kieSession.fireAllRules(); } public synchronized void undeployRule(String packageName, Locale locale) throws CorrelationException { kieBase.removeKiePackage(packageName); } private KieFileSystem createKieFileSystemWithKProject(KieServices ks) { KieModuleModel kieModuleModel = ks.newKieModuleModel(); KieBaseModel kieBaseModel = kieModuleModel.newKieBaseModel("KBase") .addPackage("rules") .setDefault(true) .setEqualsBehavior(EqualityBehaviorOption.EQUALITY) .setEventProcessingMode(EventProcessingOption.STREAM); kieBaseModel.newKieSessionModel("KSession") .setDefault( true ) .setType( KieSessionModel.KieSessionType.STATEFUL ) .setClockType( ClockTypeOption.get("realtime") ); KieFileSystem kfs = ks.newKieFileSystem(); kfs.writeKModuleXML(kieModuleModel.toXML()); return kfs; } private KieModule createKieJar(KieServices ks, Resource resource) throws Exception { kfs.write("src/main/resources/rules/rule.drl", resource); kieBuilder = ks.newKieBuilder(kfs); if (kieBuilder.getResults().hasMessages(Message.Level.ERROR)) { throw new Exception(); } return kieBuilder.getKieModule(); } } {code} -- This message was sent by Atlassian JIRA (v7.5.0#75005)