passing errors from model?

[Nick Wesselman]

Say my model does some validation of business rules. What's the best way 
to communicate those errors to the controller, and then (in the case of 
struts) translate those into ActionError's? It seems that if I want to 
communicate specific errors, creating Exception's for each case might be 
excessive. Or maybe I should create a custom Exception with a set of 
error codes and messages?

Any thoughts? How do others handle this?

Nick

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