[rules-users] Unresolved Object Reference

[Narendra Valada]

Hello,

Any ideas on what might be causing the error I am seeing? I seem to get this
error only on inner classes that are defined within other inner classes. We
have some fairly complex schemas for which XML Beans generates deeply nested
hierarchies of inner classes.

Any suggestions would be welcome.

Thanks,

Narendra


On 7/5/07, Edson Tirelli <tirelli at post.com> wrote:
>
>
>    There was a problem with CGLIB proxies much similar to this... so
> probably the same problem.
>
>    What happens is that to shadow a fact, drools needs to extend the
> actual class being asserted, and override the equals and hashcode methods.
> So, the class can't be final, nor these methods can be final. Previously I
> wasn't checking for final on these methods and that was the reason for the
> error.
>
>    I fixed that in trunk. It means, if XML Beans are generating methods
> equals/hashCode as final, drools won't be able to shadow them (and so will
> automatically disable shadowing for them), but it will not raise the error
> anymore.
>
>    Let me know if it is still a problem for you in trunk.
>
>     []s
>     Edson
>
> 2007/7/5, Ronald R. DiFrango <ron.difrango at gmail.com >:
> >
> > All this sounds eerily similar to the problem I am reporting.  In the
> > 4.0 version I am getting the following exception on those inner classes:
> >
> >
> > Exception in thread "main" java.lang.VerifyError: class
> > com.circuitcity.rtvcrms.impl.DetailLineDocumentImpl$DetailLineImplShadowProxyoverrides final method ã Ý*h '+ .û Ý*h '+
> >     at java.lang.ClassLoader.defineClass1(Native Method)
> >     at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
> >     at java.lang.ClassLoader.defineClass (ClassLoader.java:465)
> >     at org.drools.rule.MapBackedClassLoader.fastFindClass(
> > MapBackedClassLoader.java:40)
> >     at org.drools.rule.MapBackedClassLoader.loadClass(
> > MapBackedClassLoader.java:59)
> >     at java.lang.ClassLoader.loadClass (ClassLoader.java:251)
> >     at org.drools.reteoo.Rete$ObjectTypeConf.<init>(Rete.java:352)
> >     at org.drools.reteoo.Rete.assertObject(Rete.java:152)
> >     at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
> >     at org.drools.reteoo.ReteooWorkingMemory.doInsert(
> > ReteooWorkingMemory.java:70)
> >     at org.drools.common.AbstractWorkingMemory.insert(
> > AbstractWorkingMemory.java:772)
> >     at org.drools.common.AbstractWorkingMemory.insert (
> > AbstractWorkingMemory.java:584)
> >     at
> > com.circuitcity.rtvcrms.rules.RtvDecisionEngine.processDetailLines(
> > RtvDecisionEngine.java:95)
> >     at com.circuitcity.rtvcrms.rules.RtvDecisionEngine.executeRules(
> > RtvDecisionEngine.java :64)
> >     at com.circuitcity.rtvcrms.test.MainBasedTester.main(
> > MainBasedTester.java:34)
> >
> > The catch is that XML Beans objects are auto generated based upon and
> > XSD and we have limited control over what gets generated.
> >
> > On 7/5/07, Narendra Valada < narendra.valada at gmail.com> wrote:
> > >
> > > Thank you for your quick response.
> > >
> > > I cannot make the Outer class static and public since it is not an
> > > inner class.
> > >
> > > In my example, I have two inner classes : Inner and InnerInner.
> > >
> > > Class Inner is enclosed by Outer and class InnerInner is enclosed by
> > > Inner. I get the "Unable to resolve object type"  error only on the
> > > "InnerInner" class and not on the "Inner" class.
> > >
> > > Both the inner classes are defined as non-static.
> > >
> > > Thanks,
> > >
> > > Narendra
> > >
> > >
> > >
> > > On 7/5/07, Mark Proctor <mproctor at codehaus.org > wrote:
> > > >
> > > > you need to make your Outer class static and public. Look at the
> > > > sample generated with a new drools project, that uses a static public class.
> > > >
> > > > Mark
> > > > Narendra Valada wrote:
> > > >
> > > > ** *Hello,*
> > > > * *
> > > > *I am getting an "Unable to resolve object type" error on certain
> > > > XML Bean generated inner classes. I get this error only on inner classes
> > > > that have been defined within other inner classes. Please see example below.
> > > > *
> > > > * *
> > > > *Is this a known limitation of JBoss Rules (I am using JBOSS Rules
> > > > 3.0.6) or the JANINO compiler?*
> > > > * *
> > > > *Thanks.*
> > > > *
> > > >
> > > > package
> > > > *
> > > > *com.sample;
> > > >
> > > > public
> > > > class Outer{     public class Inner {     public boolean inner =
> > > > false;         public class InnerInner {
> > > >
> > > >         }
> > > >
> > > >      }
> > > >
> > > > }
> > > > * *package*
> > > > com.sample *
> > > >
> > > > import
> > > > *com.sample.Outer1.Inner.InnerInner; *
> > > >
> > > > rule
> > > > *"Hello World 1" *when*
> > > >
> > > > InnerInner()
> > > > *then*
> > > >
> > > > System.out.println(
> > > > "");*
> > > >
> > > > end
> > > > *
> > > >
> > > > ------------------------------
> > > >
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>
> --
>   Edson Tirelli
>   Software Engineer - JBoss Rules Core Developer
>   Office: +55 11 3529-6000
>   Mobile: +55 11 9287-5646
>   JBoss, a division of Red Hat @ www.jboss.com
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