dropped exceptions in Message.writeTo()

[Alan George]

I am attempting to write a transactional WS.  The client will be setting 
an SOTimeout on the connection.  On the server side I would like to 
catch the IOException (broken pipe) and roll back a UserTransaction. 
Unfortunatly I have discovered the IOException is caught in the 
Message.writeTo() and is dropped on the floor.  IOException is already 
in the throws.  Why are these exceptions drop at this point?  If I 
modified to rethrow the exceptions would this break something else?

Thanks for your advise,
-alan