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please check with 4.0.x, which will be in 4.0.5 this week, and let us
know if this is fixed or not. But hurry we are releasing 4.0.5 very
soon:<br>
<a class="moz-txt-link-freetext" href="http://anonsvn.labs.jboss.com/labs/jbossrules/branches/4.0.x/">http://anonsvn.labs.jboss.com/labs/jbossrules/branches/4.0.x/</a><br>
<br>
Mark<br>
Jason Partyka wrote:
<blockquote
cite="mid:141533D03811414094F4F37EE45ADE17763AF62727@hti-exchange.IL.Hightowerinc.com"
type="cite">
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<div dir="ltr"><font color="#000000" face="Tahoma" size="2">I can
give this a shot, but the reason why you suggest this is not obvious to
me.
</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="tahoma" size="2">Have you encountered this
problem yourself?</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="tahoma" size="2">-Jason</font></div>
<div dir="ltr"> </div>
<div dir="ltr"> </div>
<div dir="ltr"> </div>
<div id="divRpF839794" style="direction: ltr;">
<hr tabindex="-1"><font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>
[<a class="moz-txt-link-abbreviated" href="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>] On Behalf Of Anstis, Michael (M.)
[<a class="moz-txt-link-abbreviated" href="mailto:manstis1@ford.com">manstis1@ford.com</a>]<br>
<b>Sent:</b> Monday, March 10, 2008 5:06 AM<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> RE: [rules-users] Interesting null pointer exception
when inserting afact.<br>
</font><br>
</div>
<div>
<div dir="ltr" align="left"><span class="450020310-10032008"><font
color="#0000ff" face="Arial" size="2">I'm no expert but recall there
can be problems running "long running" (subjective) code from AWT's
worker thread.</font></span></div>
<div dir="ltr" align="left"><span class="450020310-10032008"></span> </div>
<div dir="ltr" align="left"><span class="450020310-10032008"><font
color="#0000ff" face="Arial" size="2">I thought it was good practice
to run your "application code" in a worker thread. This was the first
google hit I had on the matter. </font></span></div>
<div dir="ltr" align="left"><span class="450020310-10032008"></span> </div>
<div dir="ltr" align="left"><span class="450020310-10032008"><font
color="#0000ff" face="Arial" size="2"><a moz-do-not-send="true"
href="http://www.cs.helsinki.fi/u/vihavain/k03/Java/JavathreadsandGUI.html"
target="_blank">http://www.cs.helsinki.fi/u/vihavain/k03/Java/JavathreadsandGUI.html</a></font></span></div>
<div dir="ltr" align="left"><span class="450020310-10032008"></span> </div>
<div dir="ltr" align="left"><span class="450020310-10032008"><font
color="#0000ff" face="Arial" size="2">Cheers,</font></span></div>
<div dir="ltr" align="left"><span class="450020310-10032008"></span> </div>
<div dir="ltr" align="left"><span class="450020310-10032008"><font
color="#0000ff" face="Arial" size="2">Mike</font></span></div>
<br>
<blockquote style="margin-right: 0px;">
<div class="OutlookMessageHeader" dir="ltr" align="left"
lang="en-us">
<hr tabindex="-1"><font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>
[<a class="moz-txt-link-freetext" href="mailto:rules-users-bounces@lists.jboss.org">mailto:rules-users-bounces@lists.jboss.org</a>]
<b>On Behalf Of </b>Edson Tirelli<br>
<b>Sent:</b> 08 March 2008 13:15<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> Re: [rules-users] Interesting null pointer
exception when inserting afact.<br>
</font><br>
</div>
<br>
Jason,<br>
<br>
Can you please isolate and show us the rule that is creating the
problem? It is happening either in a eval() statement or in a nested
property access.<br>
<br>
[]s<br>
Edson<br>
<br>
<div><span class="gmail_quote">2008/3/7, Jason Partyka <<a
moz-do-not-send="true" href="mailto:Jason.Partyka@hightowerinc.com">Jason.Partyka@hightowerinc.com</a>>:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br>
<br>
This is in relation to drools 4.0.4<br>
<br>
I have an interesting problem. I am getting a null pointer exception
when I am inserting a fact into a StatefulSession object. What is odd
about this NPE is that, as far as I can tell (and I have inserted a
breakpoint right before I insert the fact) that all the properties in
the object are initialized, and there are no rules accessing any thing
that could be null.<br>
<br>
So here's my exception trace (just first few lines to get context):<br>
<br>
Exception in thread "AWT-EventQueue-0"
org.drools.RuntimeDroolsException: java.lang.NullPointerException<br>
at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:76)<br>
at
org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java:145)<br>
at
org.drools.reteoo.SingleTupleSinkAdapter.createAndPropagateAssertTuple(SingleTupleSinkAdapter.java:55)<br>
at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:116)<br>
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:22)<br>
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)<br>
at org.drools.reteoo.Rete.assertObject(Rete.java:177)<br>
at
org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)<br>
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)<br>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)<br>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:858)<br>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:659)<br>
at
com.hightower.drools.executablerules.Rules.setTemplate(Rules.java:112)<br>
....<br>
Caused by: java.lang.NullPointerException<br>
at
org.drools.base.mvel.MVELEvalExpression.evaluate(MVELEvalExpression.java:39)<br>
at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:72)<br>
... 39 more<br>
<br>
<br>
(that setTemplate method is not a drools template)<br>
<br>
Any ideas?<br>
<br>
Thanks,<br>
Jason<br>
<br>
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</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Edson Tirelli<br>
JBoss Drools Core Development<br>
Office: +55 11 3529-6000<br>
Mobile: +55 11 9287-5646<br>
JBoss, a division of Red Hat @ <a moz-do-not-send="true"
href="http://www.jboss.com" target="_blank">www.jboss.com</a>
</blockquote>
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