Hello, I have this exception in my Drools application and I don't know what's happening. I try to load a pkg by applying a defined change set by the KnowledgeAgent. If I load the pkg by the KnowledgeBuilder, everything is fine, but I want to use the KnowledgeAgent, so that changes are automatically recognized. Can anybody help me? Thx http://drools.46999.n3.nabble.com/file/n3959482/CardTrapping.drl CardTrapping.drl http://drools.46999.n3.nabble.com/file/n3959482/EngineStarter.java EngineStarter.java java.lang.NullPointerException at org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.getInterval(AfterEvaluatorDefinition.java:272) at org.drools.rule.VariableRestriction.getInterval(VariableRestriction.java:132) at org.drools.rule.VariableConstraint.getInterval(VariableConstraint.java:133) at org.drools.reteoo.builder.BuildUtils.gatherTemporalRelationships(BuildUtils.java:334) at org.drools.reteoo.builder.BuildUtils.calculateTemporalDistance(BuildUtils.java:298) at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:108) at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:110) at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:441) at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:821) at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:555) at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:458) at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150) at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1016) at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785) at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169) at com.wn.fraud.droolstest.starter.EngineStarter.initializeKnowledgeBase(EngineStarter.java:67) at com.wn.fraud.droolstest.starter.EngineStarter.<init>(EngineStarter.java:46) at com.wn.fraud.droolstest.starter.EngineStarter.getInstance(EngineStarter.java:33) at com.wn.fraud.droolstest.BaseFraudTest_UsingEngineStarter.createKnowledgeBase(BaseFraudTest_UsingEngineStarter.java:8) at com.wn.fraud.droolstest.BaseFraudTest.initialize(BaseFraudTest.java:47) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) 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) -- View this message in context: http://drools.46999.n3.nabble.com/NullPointerException-while-loading-pkg-... Sent from the Drools: User forum mailing list archive at Nabble.com.