Hi, 1) I use a package created/deployed in BRMS on a remote machine. The drl source file has certain dependencies in it (the data model). These dependencies are inside a jar file, used by BRMS to create/compile the package. 2) Inside my web service class I have drools-core.jar, in a lib. I have a method that uses URLClassloader to load the jar with the data model from an external directory at each service invocation (data models may get switched out every now and then). 3) I create a Properties object containing URL to the BRMS package, etc. I use this to create a new RuleAgent: RuleAgent agent = RuleAgent.newRuleAgent(MyProps); But, I get NoClassDefError or Class loading errors when the rule agent tries to load the package, it cannot see the classes I loaded from the data model jar. In fact, it does not recognize the drools core jars inside the /lib directory of my service either. However, if I put all those jars into the WEB-INF/lib directory of the webapp that constitues my web service implementation (axis2 in this case) and reboot tomcat, everything works fine. But of course this is very hokey -- is not acceptable. How do I get my RuleAgent to see the data model classes I loaded? Why does it not like the drools-core.jar inside my service? Is this going to be a class loader nightmare? Thanks, Alan J