[rules-users] 答复: Adhoc NullPointer exception in rule execution

[Zhuo Li]

Yep, Wolfgang,

 

It¡¯s a code issue ¨C I just identified it¡­ thanks. I have another thread
talking about NoClassDefFound exception. Would appreciate if you can share
your wisdom there.

 

Best

Abe

 

·¢¼þÈË: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] ´ú±í Wolfgang Laun
·¢ËÍʱ¼ä: 2012Äê3ÔÂ11ÈÕ 1:06
ÊÕ¼þÈË: Rules Users List
Ö÷Ìâ: Re: [rules-users] Adhoc NullPointer exception in rule execution

 

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.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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