[omniORB] user exception thrown client getsCORBA::SystemException

[Luke Deller]

Hi Lolke,

On Sun, 2006-01-08 at 11:26 +0100, Lolke B. Dijkstra wrote:
> The client says:
> omniORB: LocateRequest to remote: root<0>
> omniORB: throw UNKNOWN from GIOP_C.cc:247 (MAYBE,UNKNOWN_UserException)
> Caught CORBA::SystemException.2:1330446337
...
> I try to catch the dicom.ObjectNotFound exception but the catch clause 
> does not seem to work. Instead the SystemException is caught.
> Anybody knows why this is?

This sounds like you have not declared in IDL that your operation might
raise a dicom.ObjectNotFound exception.  CORBA::UNKNOWN is a subclass of
CORBA::SystemException which is thrown by the ORB when a servant throws
an unexpected exception.  "UNKNOWN_UserException" indicates that the
unexpected exception was a CORBA user exception (ie an exception which
you have declared in IDL).

Your servant is not allowed to raise any exception it likes;  it may
only raise one of the CORBA user exceptions listed in the "raises"
clause of the IDL definition of the operation (or it may propagate a
CORBA system exception).  You can find an example of the "raises" clause
in the file Naming.idl included with omniORB.  If you like reading the
CORBA specification, the relevant section is 3.13.3.

Regards,
Luke.

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