Aha, that did it, and I get ... yay, an HTTP 500 .. but the right error on the console. I guess dealing gracefully with the exception means catching it in update() and company. Figuring out how to present a UI to merge changes should be an interesting project. I can't see anything in @Begin's javadoc that tells me about return values, and I assumed page actions had to return either null to proceed to the given view-id, or optionally return a new viewid. Should I should use s:commandLink if I need to defer to a page action instead? I'll eventually move my complex navigation requirements into jbpm, but it's nice to be able to hack it out with actions first. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3979536#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...