i am using weblogic 10.3.6. I have 6 managed server and one Admin server. I observed one thing that when i up Managed6 and run my application. In one of the java file i am using one jar file to fetch one class(Bussiness Object instance). For managed 6 the code is working fine. it gives me the same class file. but if i up any other managed server then i am getting the Impl of that class.