Edson, Actually, I only use custom action classes in the RHS (see below) e.g. rule TEARDOWN_3004865719 when child0:MyClass ( state1 == 0, state2 == 0 ) then MyFunctions.performOperation( "TEARDOWN _3004865719", "message", child0, true ); end The classes referenced in the LHS will always stay the same. So if we want to re-load the class MyFunctions (since these custom actions may be updated), then I currently have to re-create the StatefulKnowledgeSession from a new KnowledgeBase, etc. so that the findClass() method is called on MyClassLoader. Cheerio, Nic Nicholas Hemley Senior Developer Sidonis | Powering a New Generation of Service Assurance