The location of the NPE is <div> at com.xxx.xxx.xxx.xxx.xxx.xxx.xxx(xxx.java:634)</div><div>and that's your code, invoked from the right hand side of rule Match.</div><div><br></div><div>-W</div><div><br><div class="gmail_quote">
2012/3/10 Zhuo Li <span dir="ltr"><<a href="mailto:milanello1998@gmail.com">milanello1998@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="ZH-CN" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span lang="EN-US">Hi, folks,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">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:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p style="margin-left:18.0pt"><u></u><span lang="EN-US"><span>1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">The yellow marked lines are
actually java file compiled from DRL file. Why there is null pointer exception
thrown from </span><span lang="EN-US" style="font-size:11.0pt">org.drools.common.DefaultAgenda.fireActivation</span><span lang="EN-US" style="font-size:11.0pt">?</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">ERROR>2012-02-25
11:42:25,071 com.</span><span lang="EN-US" style="font-size:11.0pt">xxx</span><span lang="EN-US" style="font-size:11.0pt">.</span><span lang="EN-US" style="font-size:11.0pt">xxx</span><span lang="EN-US" style="font-size:11.0pt">.</span><span lang="EN-US" style="font-size:11.0pt">xxx</span><span lang="EN-US" style="font-size:11.0pt">.</span><span lang="EN-US" style="font-size:11.0pt">xxx</span><span lang="EN-US" style="font-size:11.0pt">[DefaultQuartzScheduler_Worker-3]: Rules
run time error:</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">org.drools.runtime.rule.ConsequenceException:
rule: Match</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:916)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:845)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1056)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:733)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at com. xxx.xxx.xxx.xxx.xxx.xxx.xxx (SessionManager.java:94)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at com. xxx.xxx.xxx.xxx.xxx.xxx.</span><span lang="EN-US" style="font-size:11.0pt">yyy</span><span lang="EN-US" style="font-size:11.0pt">(SessionManagerJob.java:17)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Caused by:
java.lang.NullPointerException</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at com.xxx.xxx.xxx.xxx.xxx.xxx.xxx(</span><span lang="EN-US" style="font-size:11.0pt">xxx</span><span lang="EN-US" style="font-size:11.0pt">.java:634)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at com.xxx.xxx.xxx.xxx.xxx.</span><span lang="EN-US" style="font-size:11.0pt">yyy</span><span lang="EN-US" style="font-size:11.0pt">.</span><span lang="EN-US" style="font-size:11.0pt">yyy</span><span lang="EN-US" style="font-size:11.0pt">(</span><span lang="EN-US" style="font-size:11.0pt">yyy</span><span lang="EN-US" style="font-size:11.0pt">.java:227)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at com.xxx.xxx.xxx.xxx.xxx.</span><span lang="EN-US" style="font-size:11.0pt">yyy</span><span lang="EN-US" style="font-size:11.0pt">.</span><span lang="EN-US" style="font-size:11.0pt">zzz</span><span lang="EN-US" style="font-size:11.0pt">(</span><span lang="EN-US" style="font-size:11.0pt">zzz</span><span lang="EN-US" style="font-size:11.0pt">.java:115)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at com.xxx.xxx.xxx.xxx.xxx.</span><span lang="EN-US" style="font-size:11.0pt">yyy</span><span lang="EN-US" style="font-size:11.0pt">.</span><span lang="EN-US" style="font-size:11.0pt">ttt</span><span lang="EN-US" style="font-size:11.0pt">(</span><span lang="EN-US" style="font-size:11.0pt">ttt</span><span lang="EN-US" style="font-size:11.0pt">.java:83)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at com.xxx.xxx.xxx.xxx.xxx.</span><span lang="EN-US" style="font-size:11.0pt">yyy</span><span lang="EN-US" style="font-size:11.0pt">.</span><span lang="EN-US" style="font-size:11.0pt">uuu</span><span lang="EN-US" style="font-size:11.0pt">(</span><span lang="EN-US" style="font-size:11.0pt">uuu</span><span lang="EN-US" style="font-size:11.0pt">.java:75)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
<span style="background:yellow">at com. com.xxx.xxx.xxx.xxx.</span></span><span lang="EN-US" style="font-size:11.0pt;background:yellow">xxx.yyy.vvv</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">(</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">vvv</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">.java:9)</span><span lang="EN-US" style="font-size:11.0pt;background:yellow"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;background:yellow"> at com. com.xxx.xxx.xxx.xxx.xxx.</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">yyy</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">.</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">www</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">(</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">www</span><span lang="EN-US" style="font-size:11.0pt;background:yellow">.java:28)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:906)</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">
... 9 more</span><span lang="EN-US" style="font-size:11.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Abe<u></u><u></u></span></p>
</div>
</div>
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