[omniORB] User exception from preinvoke

[Arnault Bonafos]

Hello,
We used to throw a UserException with omniORB2 when a client tried to
contact an object with an invalid id. Now we use omniORB4 and the preinvoke
mechanism to load objects, the standard says, and so omniORB4 implements it,
that only CORBA::SystemException or ForwardRequest can be thrown from the
preinvoke implementation.

By any chance does someone know of a trick to be able to continue to throw
user exception in that situation (preinvoke + invalid object id).

TIA,
Arnault.
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