5:57 a.m.
Odd,
Looks like it is a problem in the internal of mvel, there's two things I'd suggest
you could try:
Firstly try change it to be something similar to:
for (int i=0; i<ucells.length; i++)
{
UnltranCell toInsert = ucells[i];
insert( toInsert );
}
If you are lucky this may sort out the type inference.
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.
Thomas
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Ryan Fitzgerald
Sent: 19 March 2010 10:40
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Exception during insert
**Apologies if this post starts a new thread**
Hi Thomas,
I get a series of com.sample.UtranCell strings printed expected.
So the array seems to be correctly comprised of UtranCell objects.
I have the following import statement in the drl file:
import com.sample.UtranCell;
Weird!
/Ryan.
From: rules-users-boun...(a)lists.jboss.org
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Ryan Fitzgerald
Sent: 19 March 2010 09:41
To: rules-users(a)lists.jboss.org
Subject: [rules-users] Exception during insert
Hi,
I get the following exception when trying to insert an object from within a
rule consequence:
[Error: object is not an instance of declaring class]
The rule is as follows:
rule "Utran Cell Selection Rule"
salience 50
dialect "java"
when
then
UtranCell[] ucells =
TopologyService.getInstance().getUtranCells();
for (int i=0; i<ucells.length; i++) {
insert( ucells[i] );
}
end
And it works fine if I replace the insert with System.out.println(ucells[i]) -
it seems to be something problematic with the insert. Full trace is below.
I can't see what the problem is...any ideas?
Thanks,
Ryan.
org.drools.runtime.rule.ConsequenceException: [Error: object is not an instance
of declaring class]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0]
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:627)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:183)
at com.sample.DroolsTest.main(DroolsTest.java:28)
Caused by: [Error: object is not an instance of declaring class]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0]
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:389)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:138)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:133)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:104)
at org.mvel2.MVEL.executeExpression(MVEL.java:995)
at
org.drools.base.dataproviders.MVELDataProvider.getResults(MVELDataProvider.java:91)
at org.drools.reteoo.FromNode.evaluateAndPropagate(FromNode.java:124)
at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:104)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:28)
at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:116)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:28)
at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:116)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:28)
at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:116)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:78)
at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:114)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:108)
at
com.sample.Rule_Utran_Cell_Selection_Rule_0.consequence(Rule_Utran_Cell_Selection_Rule_0.java:9)
at
com.sample.Rule_Utran_Cell_Selection_Rule_0ConsequenceInvoker.evaluate(Rule_Utran_Cell_Selection_Rule_0ConsequenceInvoker.java:18)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934)
... 6 more
Caused by: java.lang.IllegalArgumentException: object is not an instance of
declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:931)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:316)
... 36 more
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