[jboss-jira] [JBoss JIRA] (DROOLS-39) A NPE occurs silently when execute a complex rule a lot of time

A NPE occurs silently when execute a complex rule a lot of time --------------------------------------------------------------- Key: DROOLS-39 URL: https://issues.jboss.org/browse/DROOLS-39 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.5 Environment: Windows XP, java 1.5 Reporter: Jérémy SOULA Assignee: Mario Fusco Attachments: drools-bugs.zip Found this bug when I update from drools v5.3 Here are the rule that simulate this bug : {noformat} rule "toto" when $bean:Bean ( anotherBean!=null, ( anotherBean.anotherBean !=null && ( ( anotherBean.anotherBean.attribute=="TOTO" && anotherBean.attribute=="TOTO" ) || ( anotherBean.anotherBean.attribute=="TATA" && anotherBean.attribute=="TATA" ) ) ) || ( anotherBean.attribute=="TOTO" ) ) then ... end {noformat} A part of main: {noformat} for (int i = 0; i < 400; i++) { Bean input1 = new Bean(); input1.setAttribute("" + i); input1.setAnotherBean(new Bean()); kbase.newStatelessKnowledgeSession().execute(Arrays.asList(input1)); } {noformat} At one time, the log print this exception. Units tests of my application are 100%, but this exception in the log is quite disturbing {noformat}java.lang.RuntimeException: cannot invoke getter: getAnotherBean [declr.class: fr.jsoula.jboss.drools.bugs.npe.Bean; act.class: fr.jsoula.jboss.drools.bugs.npe.Bean] (see trace) at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:74) at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108) at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:108) at org.mvel2.ast.And.getReducedValueAccelerated(And.java:34) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85) at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113) at org.mvel2.MVEL.executeExpression(MVEL.java:930) at org.drools.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:70) at org.drools.rule.constraint.MvelConditionEvaluator.ensureBranchEvaluation(MvelConditionEvaluator.java:117) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:101) at org.drools.rule.constraint.MvelConditionEvaluator.ensureBranchEvaluation(MvelConditionEvaluator.java:120) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:102) at org.drools.rule.constraint.MvelConditionEvaluator.ensureBranchEvaluation(MvelConditionEvaluator.java:120) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:101) at org.drools.rule.constraint.MvelConditionEvaluator.ensureCompleteEvaluation(MvelConditionEvaluator.java:90) at org.drools.rule.constraint.MvelConditionEvaluator.getAnalyzedCondition(MvelConditionEvaluator.java:82) at org.drools.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:270) at org.drools.rule.constraint.MvelConstraint.access$200(MvelConstraint.java:51) at org.drools.rule.constraint.MvelConstraint$ConditionJitter.run(MvelConstraint.java:250) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676) at java.lang.Thread.run(Thread.java:595) 31 Caused by: java.lang.RuntimeException: cannot invoke getter: getAnotherBean [declr.class: fr.jsoula.jboss.drools.bugs.npe.Bean; act.class: fr.jsoula.jboss.drools.bugs.npe.Bean] (see trace) at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:74) at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:40) ... 23 more Caused by: java.lang.RuntimeException: unable to invoke method: fr.jsoula.jboss.drools.bugs.npe.Bean.getAttribute: target of method is null at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:66) at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:40) ... 24 more Caused by: java.lang.NullPointerException at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:592) at org.mvel2.optimizers.impl.refl.nodes.GetterAccessor.getValue(GetterAccessor.java:43) ... 25 more {noformat}