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

Yep, Wolfgang, It’s a code issue � I just identified it… thanks. I have another thread talking about NoClassDefFound exception. Would appreciate if you can share your wisdom there. Best Abe 发件人: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] 代表 Wolfgang Laun 发送时间: 2012年3月11日 1:06 收件人: Rules Users List 主题: 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(a)gmail.com&gt; 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 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users