All,<br><br>I am using JAXB classes as my model objects that are getting passed into the rules engine.&nbsp; I get the exception below.&nbsp; Here is how I am loading the rules and adding the objects into working memory:<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try
<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; builder = new PackageBuilder();<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; builder.addPackageFromDrl( new InputStreamReader( RtvDecisionEngine.class.getResourceAsStream(&quot;rtv.drl&quot; ) ) );<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; builder.addPackageFromDrl
( new InputStreamReader(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RtvDecisionEngine.class.getResourceAsStream(&quot;modelDiscrepancyRules.drl&quot; ) ) );<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ruleBase = RuleBaseFactory.newRuleBase();<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ruleBase.addPackage
( builder.getPackage() );<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; catch(Exception e)<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; throw new RuntimeException(&quot;Failure loading the Rules&quot;, e);<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; final StatefulSession session = 
ruleBase.newStatefulSession();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DetailLine line = rtvLines[i];<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; session.insert(line);<br><br>Ron<br><br>--------------------------------------------------- Exception ---------------------------------------------------&nbsp; 
<br><br>Exception in thread &quot;main&quot; java.lang.VerifyError: class com.circuitcity.rtvcrms.impl.DetailLineDocumentImpl$DetailLineImplShadowProxy overrides final method 
.
<br>&nbsp;&nbsp;&nbsp; at java.lang.ClassLoader.defineClass1
(Native Method)<br>&nbsp;&nbsp;&nbsp; at java.lang.ClassLoader.defineClass(ClassLoader.java:620)<br>&nbsp;&nbsp;&nbsp; at java.lang.ClassLoader.defineClass(ClassLoader.java:465)<br>&nbsp;&nbsp;&nbsp; at org.drools.rule.MapBackedClassLoader.fastFindClass(MapBackedClassLoader.java
:40)<br>&nbsp;&nbsp;&nbsp; at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:59)<br>&nbsp;&nbsp;&nbsp; at java.lang.ClassLoader.loadClass(ClassLoader.java:251)<br>&nbsp;&nbsp;&nbsp; at org.drools.reteoo.Rete$ObjectTypeConf.&lt;init&gt;(Rete.java
:352)<br>&nbsp;&nbsp;&nbsp; at org.drools.reteoo.Rete.assertObject(Rete.java:152)<br>&nbsp;&nbsp;&nbsp; at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)<br>&nbsp;&nbsp;&nbsp; at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java
:70)<br>&nbsp;&nbsp;&nbsp; at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:772)<br>&nbsp;&nbsp;&nbsp; at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:584)<br>&nbsp;&nbsp;&nbsp; at com.circuitcity.rtvcrms.rules.RtvDecisionEngine.processDetailLines
(RtvDecisionEngine.java:95)<br>&nbsp;&nbsp;&nbsp; at com.circuitcity.rtvcrms.rules.RtvDecisionEngine.executeRules(RtvDecisionEngine.java:64)<br>&nbsp;&nbsp;&nbsp; at com.circuitcity.rtvcrms.test.MainBasedTester.main(MainBasedTester.java:34)<br><br>