"bstansberry(a)jboss.com" wrote : Would #1 be that bad? You create ExtendedHASingletonElectionPolicy with the missing methods from the AS 5 API. If the injected policy implements Extended, you invoke on it the way AS 5 does. Otherwise it gets used as it is now. In ExtendedHASingletonElectionPolicy javadoc, any HASingletonElectionPolicy methods that don't get called anymore should have comments noting that fact. | | Don't get me wrong; I can see how it would get messy. #3 is OK. Hmm, looking at #1 again, I suppose it's the same thing that was done for HAMembershipExtendedListener. I'll go with #1. "bstansberry(a)jboss.com" wrote : I know you did a lot of refactoring to tighten things up in trunk, i.e. with HASingletonElectionPolicyBase; that doesn't need to happen in 4.x, and *shouldn't* happen if it might break some custom subclass. HASingletonElectionPolicySimple just needs to work correctly. Bingo! The aim for 4.2.x is just fixing it :) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4142457#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...