[jboss-jira] [JBoss JIRA] (DROOLS-1710) Jitting process may randomly fail during multithreaded execution

[Tibor Zimányi (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-1710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tibor Zimányi updated DROOLS-1710:
----------------------------------
    Labels: jitting  (was: )


> Jitting process may randomly fail during multithreaded execution
> ----------------------------------------------------------------
>
>                 Key: DROOLS-1710
>                 URL: https://issues.jboss.org/browse/DROOLS-1710
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>            Reporter: Mario Fusco
>            Assignee: Mario Fusco
>              Labels: jitting
>             Fix For: 7.3.0.Final
>
>
> The jitting process assumes that the mvel constraint has been evaluated at least once before it kicks in. This may not be the case during a multithreaded execution (especially when running with many threads and a very low jitting threshold) because the jitting process may start when other threads have already requested the constraint evaluation using the mvel interpreted constraint (thus incrementing the jitting counter) but none of them had enough time to complete it. When this happens the jitting process trying to work on an uncompleted AST throwing internally an exception like the following:
> {code}
> Exception in thread "drools-worker-1" java.lang.RuntimeException: java.lang.RuntimeException: Null accessor on node: firings
> 	at org.drools.core.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:346)
> 	at org.drools.core.rule.constraint.MvelConstraint.access$200(MvelConstraint.java:82)
> 	at org.drools.core.rule.constraint.MvelConstraint$ConditionJitter.run(MvelConstraint.java:313)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.RuntimeException: Null accessor on node: firings
> 	at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeNode(ConditionAnalyzer.java:302)
> 	at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeSingleCondition(ConditionAnalyzer.java:159)
> 	at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeCondition(ConditionAnalyzer.java:138)
> 	at org.drools.core.rule.constraint.ConditionAnalyzer.analyzeCondition(ConditionAnalyzer.java:109)
> 	at org.drools.core.rule.constraint.MvelConditionEvaluator.getAnalyzedCondition(MvelConditionEvaluator.java:129)
> 	at org.drools.core.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:333)
> 	... 5 more
> {code}



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