Ross Tuck does not blog often, but when he does you probably are going to learn something useful. In his latest post he shares some techniques regarding exceptions.

Over the last couple years, I’ve started putting my Exception messages inside static methods on custom exception classes. This is hardly a new trick, Doctrine’s been doing it for the better part of a decade. Still, many folks are surprised by it, so this article explains the how and why.

http://rosstuck.com/formatting-exception-messages/