[rules-users] Adhoc NullPointer exception in rule execution

[Zhuo Li]

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.handleExcept
ion(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.j
ava:733)

        at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j
ava:699)

        at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeS
essionImpl.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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