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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Odd,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Looks like it is a problem in the internal of mvel, there’s two things I’d suggest you could try:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Firstly try change it to be something similar to:<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:10.0pt;font-family:"Courier New"">for (int i=0; i<ucells.length; i++)
<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:10.0pt;font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:10.0pt;font-family:"Courier New"">UnltranCell toInsert = ucells[i];<br>
insert( toInsert );<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> }</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">If you are lucky this may sort out the type inference.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">The other option is to try rewriting the rule to be more declarative and not have the iteration. This can be achieved by inserting the UtranCell array as
a global (cells) and then having a rule where the when part similar to “$cell : UltranCell() from cells” and a then part which inserts the single cell returned into the knowledge base.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thomas<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:
"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;
font-family:"Tahoma","sans-serif""> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Ryan Fitzgerald<br>
<b>Sent:</b> 19 March 2010 10:40<br>
<b>To:</b> rules-users@lists.jboss.org<br>
<b>Subject:</b> Re: [rules-users] Exception during insert<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">**Apologies if this post starts a new thread**<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi Thomas,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I get a series of
</span><span style="font-size:10.0pt;font-family:"Courier New"">com.sample.UtranCell
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">strings printed expected.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">So the array seems to be correctly comprised of UtranCell objects.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I have the following import statement in the drl file:<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New";
color:#960000;background:#E8F2FE">import</span></b><span style="font-size:10.0pt;
font-family:"Courier New";color:black;background:#E8F2FE"> com.sample.UtranCell;</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Weird!<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">/Ryan.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">From: rules-users-boun...@lists.jboss.org
<br>
[<a href="mailto:rules-users-boun...@lists.jboss.org">mailto:rules-users-boun...@lists.jboss.org</a>] On Behalf Of Ryan Fitzgerald<br>
Sent: 19 March 2010 09:41<br>
To: rules-users@lists.jboss.org<br>
Subject: [rules-users] Exception during insert<br>
<br>
Hi,<br>
<br>
I get the following exception when trying to insert an object from within a <br>
rule consequence:<br>
<br>
[Error: object is not an instance of declaring class]<br>
<br>
The rule is as follows:<br>
<br>
rule "Utran Cell Selection Rule"<br>
salience 50<br>
dialect "java"<br>
when<br>
then<br>
UtranCell[] ucells = <br>
TopologyService.getInstance().getUtranCells();<br>
for (int i=0; i<ucells.length; i++) {<br>
insert( ucells[i] );<br>
}<br>
end<br>
<br>
<br>
And it works fine if I replace the insert with System.out.println(ucells[i]) - <br>
it seems to be something problematic with the insert. Full trace is below.<br>
<br>
I can't see what the problem is...any ideas?<br>
<br>
Thanks,<br>
Ryan.<br>
<br>
org.drools.runtime.rule.ConsequenceException: [Error: object is not an instance <br>
of declaring class]<br>
[Near : {... Unknown ....}]<br>
^<br>
[Line: 1, Column: 0]<br>
at <br>
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)<br>
at <br>
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943)<br>
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885)<br>
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086)<br>
at <br>
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660)<br>
at <br>
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:627)<br>
at <br>
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:183)<br>
at com.sample.DroolsTest.main(DroolsTest.java:28)<br>
Caused by: [Error: object is not an instance of declaring class]<br>
[Near : {... Unknown ....}]<br>
^<br>
[Line: 1, Column: 0]<br>
at <br>
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:389)<br>
at <br>
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:138)<br>
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:133)<br>
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)<br>
at <br>
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:104)<br>
at org.mvel2.MVEL.executeExpression(MVEL.java:995)<br>
at <br>
org.drools.base.dataproviders.MVELDataProvider.getResults(MVELDataProvider.java:91)<br>
at org.drools.reteoo.FromNode.evaluateAndPropagate(FromNode.java:124)<br>
at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:104)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:28)<br>
at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:116)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:28)<br>
at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:116)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:28)<br>
at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:116)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)<br>
at <br>
org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:78)<br>
at <br>
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)<br>
at <br>
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)<br>
at <br>
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)<br>
at <br>
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)<br>
at <br>
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)<br>
at <br>
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)<br>
at <br>
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:114)<br>
at <br>
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:108)<br>
at <br>
com.sample.Rule_Utran_Cell_Selection_Rule_0.consequence(Rule_Utran_Cell_Selection_Rule_0.java:9)<br>
at <br>
com.sample.Rule_Utran_Cell_Selection_Rule_0ConsequenceInvoker.evaluate(Rule_Utran_Cell_Selection_Rule_0ConsequenceInvoker.java:18)<br>
at <br>
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934)<br>
... 6 more<br>
Caused by: java.lang.IllegalArgumentException: object is not an instance of <br>
declaring class<br>
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br>
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)<br>
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)<br>
at java.lang.reflect.Method.invoke(Unknown Source)<br>
at <br>
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:931)<br>
at <br>
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:316)<br>
... 36 more</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
</div>
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