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.



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