Hi there... I post something that I just wrote in the irc channel...I hope u can help me. I use JBoss 4.2.2 and drools 4.0.4 (IDE and jbrms). I deployed my rule assets into the jbrms (technical rules, business rules, decision tables, ruleflows, object model, DSLs). Then i deployed my J2EE application into the same JBoss. My J2ee module is an .ear file which contains a Web-app, some EJBs, the Drools fundamental libs and a class which invokes the RuleAgent. The .ear file contains the object model as well. So I have got the object model duplicated. One instance in the jbrms and the other one in the .ear file. For this reason I get back an "InvalidClassException" from the RuleAgent each time I call the ruleagent itself. So... If I would be able to avoid deployin' the Obj Model into the brms I would have just one instance of the Obj model... I would have just the .ear object model. Do u know how Could I do it? Thank You anyway. Bye bye. Massi