NullPointerException on org.mvel2.MVEL.executeExpression() ---------------------------------------------------------- Key: DROOLS-1751 URL: https://issues.jboss.org/browse/DROOLS-1751 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.3.0.Final Reporter: Toshiya Kobayashi Assignee: Mario Fusco Labels: support Under the conditions: - 2 KiePackages with the same package name but different rules - Those packages are used by a kbase so "inUse = true" - Create another kbase and call kbase.addPackages() for those packages MVELDialectRuntimeData has a problem in merging mvelReaders so later rule execution fails with NullPointerException. {noformat} java.lang.NullPointerException: null at org.mvel2.MVEL.executeExpression(MVEL.java:953) at org.drools.core.util.MVELSafeHelper$RawMVELEvaluator.executeExpression(MVELSafeHelper.java:506) at org.drools.core.base.extractors.MVELObjectClassFieldReader.getValue(MVELObjectClassFieldReader.java:140) at org.drools.core.rule.Declaration.getValue(Declaration.java:222) at org.drools.core.base.mvel.MVELCompilationUnit.updateFactory(MVELCompilationUnit.java:386) at org.drools.core.base.mvel.MVELCompilationUnit.getFactory(MVELCompilationUnit.java:320) at org.drools.core.base.dataproviders.MVELDataProvider.evaluate(MVELDataProvider.java:137) at org.drools.core.base.dataproviders.MVELDataProvider.getResults(MVELDataProvider.java:133) at org.drools.core.phreak.PhreakFromNode.doLeftInserts(PhreakFromNode.java:106) at org.drools.core.phreak.PhreakFromNode.doNode(PhreakFromNode.java:68) at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:387) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:333) at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:169) at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:127) at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:212) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:87) at org.drools.core.concurrent.AbstractRuleEvaluator.internalEvaluateAndFire(AbstractRuleEvaluator.java:34) at org.drools.core.concurrent.SequentialRuleEvaluator.evaluateAndFire(SequentialRuleEvaluator.java:43) at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1067) at org.drools.core.common.DefaultAgenda.internalFireAllRules(DefaultAgenda.java:1014) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1006) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1320) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1311) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1295) at org.drools.compiler.integrationtests.Misc2Test.testMergeMVELDialect(Misc2Test.java:9109) {noformat}