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<DIV><SPAN class=093103914-23032010><FONT face=Arial color=#0000ff size=2>I
found the problem - noobie mistake!</FONT></SPAN></DIV>
<DIV><SPAN class=093103914-23032010><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=093103914-23032010><FONT face=Arial color=#0000ff size=2>As you
suggested there was another rule which was being triggered by the insert
and there was a bug in that rule. I was focusing on the insert because this is
where the stack-trace was indicating I look.</FONT></SPAN></DIV>
<DIV><SPAN class=093103914-23032010><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=093103914-23032010><FONT face=Arial color=#0000ff size=2>Thanks
Thomas!</FONT></SPAN></DIV>
<DIV><SPAN class=093103914-23032010><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=093103914-23032010><FONT face=Arial color=#0000ff
size=2>/Ryan.</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <B>On Behalf Of </B>Swindells,
Thomas<BR><B>Sent:</B> 23 March 2010 13:59<BR><B>To:</B> Rules Users
List<BR><B>Subject:</B> Re: [rules-users] NullPointerException while inserting
Facts<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">The
most likely reason for this is that one of your rules is trying to evaluate a
value which is null. The when part of a rule is evaluated as the
fact is inserted and may be evaluated even if the then part will never be
reached.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Looking
at your stack trace it looks like the rule involved may have a NOT in it.
Have a careful look through your rules and see if there is a case where a null
pointer may occur and/or try removing them one by one until it stops breaking,
if that doesn’t work can you post your rules as well.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Thomas<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
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<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0cm; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<B>On Behalf Of </B>Sebastian Furth<BR><B>Sent:</B> 23 March 2010
13:11<BR><B>To:</B> rules-users@lists.jboss.org<BR><B>Subject:</B> [rules-users]
NullPointerException while inserting Facts<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Hi,<BR><BR>we are currently trying to integrate DROOLS 5.1 in
our project. <BR>In our Project we have two different kinds of Facts, called
Values and Inputs. We don't have any problems with inserting Input instances but
sometimes when we try to insert an instance of the Value class (@see: <A
href="http://www.pastie.org/private/juv7hh7rxahpluo5agu3q">http://www.pastie.org/private/juv7hh7rxahpluo5agu3q</A>)
we get the following
NullPointerException:<BR><BR>java.lang.NullPointerException<BR>
at org.drools.reteoo.LeftTuple.get(LeftTuple.java:265)<BR> at
org.drools.reteoo.LeftTuple.get(LeftTuple.java:300)<BR> at
org.drools.rule.VariableRestriction$ObjectVariableContextEntry.updateFromTuple(VariableRestriction.java:320)<BR>
at
org.drools.common.SingleBetaConstraints.updateFromTuple(SingleBetaConstraints.java:119)<BR>
at
org.drools.reteoo.NotNode.assertLeftTuple(NotNode.java:98)<BR>
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)<BR>
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:34)<BR>
at
org.drools.reteoo.NotNode.assertLeftTuple(NotNode.java:123)<BR>
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:145)<BR>
at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:57)<BR>
at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)<BR>
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)<BR>
at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)<BR>
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)<BR>
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)<BR>
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)<BR>
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)<BR>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)<BR>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)<BR>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)<BR>
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:216)<BR>
at
de.d3web.we.drools.DroolsAction.addFacts(DroolsAction.java:296)<BR>
at
de.d3web.we.drools.DroolsAction.createKnowledgeSession(DroolsAction.java:268)<BR>
at de.d3web.we.drools.DroolsAction.execute(DroolsAction.java:67)<BR><BR>The
weird thing is that we don't get this exception with all instances of the Value
class - some of them can be inserted, others not. The objects are created
correctly - we've already debugged this. The crash happens somewhere deeper in
the drools api.<BR clear=all><BR>It would be really great if you could give us a
hint how we could fix this problem.<BR><BR>Thank you in advance.<BR><BR>Best
regards<BR><BR>Sebastian Furth<o:p></o:p></P></DIV></DIV><BR>
<HR>
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