[rules-users] Rete Tree does not load in the plugin

[Anil]

I don't know whether this is the right place for this question.

The Rete Tree view of the Eclipse drl editor does fails for the example 
drl fild, with "Rete Tree Build Error".
I tried the suggestion given in 
http://www.nabble.com/Problems-with-drools-4.0.7-examples-tp18091849p18095457.html 
as well, but does not work.

Did any one experienced the same thing ...

I have  Version: 2.0.0.Beta1-R200810311334 of Jboss Tools
on Eclipse,
Version: 3.4.1
Build id: M20080911-1700



Stack Trace:

java.lang.Exception: Unable to parse rules to show RETE view!
at 
org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:147)
at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244)
at 
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

org.drools.RuntimeDroolsException: Unable to resolve class 
'com.sample.DroolsTest$Message'
at 
org.drools.base.ClassFieldAccessorCache.getClass(ClassFieldAccessorCache.java:282)
at 
org.drools.base.ClassFieldAccessorCache.getClassObjectType(ClassFieldAccessorCache.java:206)
at 
org.drools.base.ClassFieldAccessorStore.merge(ClassFieldAccessorStore.java:309)
at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:463)
at org.drools.reteoo.ReteooRuleBase.addPackage(ReteooRuleBase.java:381)
at 
org.drools.eclipse.editors.rete.ReteViewer.getRuleBase(ReteViewer.java:115)
at 
org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:145)
at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244)
at 
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

java.lang.reflect.InvocationTargetException
at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:251)
at 
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Caused by: java.lang.Exception: Unable to parse rules to show RETE view!
at 
org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:147)
at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244)
... 1 more
Root exception:
java.lang.Exception: Unable to parse rules to show RETE view!
at 
org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:147)
at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244)
at 
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)