Why not just use NestableException in Commons Lang?
Has been proposed http://marc.theaimsgroup.com/?l=jakarta-commons-dev&m=106304647620410&w=2 apaprently included in some patch http://marc.theaimsgroup.com/?l=jakarta-commons-dev&m=106369042012878&w=2 but last I checked it wasn't in the repository.
Personally, I'd be ok with requiring 1.4 for the stated reasons, but if the majority finds the added dependency is worth the effect of 1.3 compatiblity, so be it.
J.Pietschmann
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