To: Rules Users List <rules-users@lists.jboss.org>
From: CK <chrisckc@gmail.com>
Sent by: rules-users-bounces@lists.jboss.org
Date: 12/02/2009 10:28PM
Subject: Re: [rules-users] Interface implementation not working..

Try changing your BOM_TRANSACTION_DETAILS Display() method access to public and see if it works. 

Currently, you have it as "void Display()" in your BOM_TRANSACTION_DETAILS method declaration.  Change it to "public void Display()".  It might solve your problem.

No need to change method declaration in the interface as it's correct.

-Chris

On Dec 2, 2009, at 1:35 AM, Deepak Jambhekar wrote:

Hi....

I have created a rule which is as below

rule "myrule"

dialect "mvel"

when

tr : BOM_TRANSACTION_DETAILS( country == "CH" )

then

tr.setCarrierName( "orange" );

tr.Display();

end

And the Model class is defined as below...

interface Generalized

{

void Display();

}

public class BOM_TRANSACTION_DETAILS implements Generalized {

          getter and setter.....

          void Display()

{

.....

}

}

Now when I run this rule, it is giving me the following exception . Can any one please help me why this exception is coming....? and also when I removed the Display() from interface Generalized the code works fine...

So is this because of Interface?? Can we use interface for defining Models..??

org.drools.runtime.rule.ConsequenceException : [Error: tr.Display(): Class org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer can not access a member of class com.drools.icas.transaction.Generalized with modifiers "public abstract"]

[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:1082 )

at org.drools.common.AbstractWorkingMemory.fireAllRules( AbstractWorkingMemory.java:682 )

at org.drools.common.AbstractWorkingMemory.fireAllRules( AbstractWorkingMemory.java:649 )

at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules( StatefulKnowledgeSessionImpl.java:177 )

at com.drools.icas.transaction.DemoTest.main( DemoTest.java:92 )

Caused by: [Error: tr.Display(): Class org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer can not access a member of class com.drools.icas.transaction.Generalized with modifiers "public abstract"]

[Near : {... Unknown ....}]

             ^

[Line: 1, Column: 0]

at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain( ReflectiveAccessorOptimizer.java:382 )

at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor( ReflectiveAccessorOptimizer.java:140 )

at org.mvel2.ast.ASTNode.getReducedValueAccelerated( ASTNode.java:137 )

at org.mvel2.MVELRuntime.execute( MVELRuntime.java:91 )

at org.mvel2.compiler.CompiledExpression.getValue( CompiledExpression.java:101 )

at org.mvel2.MVEL.executeExpression( MVEL.java:968 )

at org.drools.base.mvel.MVELConsequence.evaluate( MVELConsequence.java:89 )

at org.drools.common.DefaultAgenda.fireActivation( DefaultAgenda.java:934 )

... 6 more

Caused by: java.lang.IllegalAccessException : Class org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer can not access a member of class com.drools.icas.transaction.Generalized with modifiers "public abstract"

at sun.reflect.Reflection.ensureMemberAccess( Reflection.java:65 )

at java.lang.reflect.Method.invoke( Method.java:583 )

at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod( ReflectiveAccessorOptimizer.java:936 )

at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain( ReflectiveAccessorOptimizer.java:321 )

... 13 more

Thanks....

Deepak  Jambhekar

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