What output do you get if you do System.out.println(ucells[i].getClass().getName())?

 

My guess is that you either don’t actually have an array of type UtranCell’s or you haven’t imported UtranCell correctly.

 

Thomas

 

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Ryan Fitzgerald
Sent: 19 March 2010 09:41
To: rules-users@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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