NullPointerException at org.drools.core.common.LeftTupleSetsImpl.removeInsert(LeftTupleSetsImpl.java:141) --------------------------------------------------------------------------------------------------------- Key: DROOLS-998 URL: https://issues.jboss.org/browse/DROOLS-998 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.3.0.Final Environment: OpenJDK Runtime Environment (IcedTea 2.6.3) (7u91-2.6.3-0ubuntu0.14.04.1) Reporter: Christian Spurk Assignee: Mario Fusco Fix For: 6.4.0.CR1 The following {{NullPointerException}} occurs for the following rule: {code} Exception in thread "main" java.lang.NullPointerException at org.drools.core.common.LeftTupleSetsImpl.removeInsert(LeftTupleSetsImpl.java:141) at org.drools.core.common.LeftTupleSetsImpl.addDelete(LeftTupleSetsImpl.java:80) at org.drools.core.phreak.PhreakAccumulateNode.doLeftDeletes(PhreakAccumulateNode.java:603) at org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:65) at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:565) at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:536) at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:372) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:332) at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:166) at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:123) at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:194) at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:142) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:978) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1292) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1294) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1281) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1260) at org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:109) at org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:34) at org.drools.core.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:292) at Test.main(Test.java:13) {code} {code} rule "test" when not( String() ) accumulate( Long(); sum(1) ) ( Boolean() or not( Float() ) ) then insert(new String()); end {code} (Please ignore the nonsensical rule; I simply couldn't reproduce this issue in any better way without providing you my larger system where the (more complex) rule makes more sense.) I'm using a default KIE configuration to load the rule: {{kmodule.xml}}: {code} <?xml version="1.0" encoding="UTF-8"?> <kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule" /> {code} {{Test.java}}: {code} import org.kie.api.KieBase; import org.kie.api.KieServices; import org.kie.api.runtime.StatelessKieSession; import org.kie.internal.command.CommandFactory; public class Test { public static void main(String[] args) { KieBase kieBase = KieServices.Factory.get().getKieClasspathContainer() .getKieBase(); StatelessKieSession session = kieBase.newStatelessKieSession(); session.execute(CommandFactory.newFireAllRules()); } } {code} This issue might be related with DROOLS-987.