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

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-39?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco reassigned DROOLS-39:
---------------------------------

    Assignee: Mario Fusco  (was: Mark Proctor)

    
> 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}

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