[rules-users] Adhoc NullPointer exception in rule execution

[Wolfgang Laun]

The location of the NPE is
    at com.xxx.xxx.xxx.xxx.xxx.xxx.xxx(xxx.java:634)
and that's your code, invoked from the right hand side of rule Match.

-W

2012/3/10 Zhuo Li <milanello1998 at gmail.com>

>  Hi, folks,****
>
> ** **
>
> I’m using Drools 5.1, MVEL dialect, JDK 1.6 to build a OLTP system running
> on tomcat 6.0.28. the runtime environment is on a cloud virtual and node
> profile is relatively small. We’ve noticed below run time exceptions from
> prod since it’s online from day one which is impacting transaction
> processing. However it is happening adhoc-ly. Here I have 1 question:****
>
> ** **
>
> **1.       **The yellow marked lines are actually java file compiled from
> DRL file. Why there is null pointer exception thrown from
> org.drools.common.DefaultAgenda.fireActivation?****
>
> ** **
>
> ERROR>2012-02-25 11:42:25,071 com.xxx.xxx.xxx.xxx[DefaultQuartzScheduler_Worker-3]:
> Rules run time error:****
>
> org.drools.runtime.rule.ConsequenceException: rule: Match****
>
>  ****
>
>         at
> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
> ****
>
>         at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:916)****
>
>         at
> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:845)****
>
>         at
> org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1056)****
>
>         at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:733)
> ****
>
>         at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699)
> ****
>
>         at
> org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
> ****
>
>         at com. xxx.xxx.xxx.xxx.xxx.xxx.xxx (SessionManager.java:94)****
>
>         at com. xxx.xxx.xxx.xxx.xxx.xxx.yyy(SessionManagerJob.java:17)****
>
>         at org.quartz.core.JobRunShell.run(JobRunShell.java:202)****
>
>         at
> org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
> ****
>
> Caused by: java.lang.NullPointerException****
>
>         at com.xxx.xxx.xxx.xxx.xxx.xxx.xxx(xxx.java:634)****
>
>         at com.xxx.xxx.xxx.xxx.xxx.yyy.yyy(yyy.java:227)****
>
>         at com.xxx.xxx.xxx.xxx.xxx.yyy.zzz(zzz.java:115)****
>
>         at com.xxx.xxx.xxx.xxx.xxx.yyy.ttt(ttt.java:83)****
>
>         at com.xxx.xxx.xxx.xxx.xxx.yyy.uuu(uuu.java:75)****
>
>         at com. com.xxx.xxx.xxx.xxx.xxx.yyy.vvv(vvv.java:9)****
>
>         at com. com.xxx.xxx.xxx.xxx.xxx.yyy.www(www.java:28)****
>
>         at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:906)****
>
>         ... 9 more****
>
> Best regards****
>
> Abe****
>
> _______________________________________________
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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