[OJB-developers] Exceptions

[<Joa...@tp...>]

Hy,

once again I got some issues with Exception handling. There are many 
places in the code where Throwable is caught. I think this is quite bad, 
because most of the times it is just re-thrown as a different exception 
(often resulting in lost information). The problem is increased when the 
re-thrown Exception is a ODMG-Exception, as in this case we can't use the 
cause-exception system that I added to PersistenceBrokerException. To 
enhance the situation I've got two suggestions. One of them has been 
suggested by John Freeborg on 17. 4. 2002 (mail to be found at 
http://sourceforge.net/mailarchive/forum.php?thread_id=645206&forum_id=4880) 
but unfortunately noone anwsered and he hasn't posted since.

- stop excessive use of "catch (Throwable foo)" in favour of more specific 
catch-clauses (see Mail-Archive-Link for details).
- throw a custom subclass of ODMGException/LockNotGrantedException/... 
instead of the original to make use of the same mechanism that I added to 
PersistenceBrokerException, at least with JDK 1.4 this greatly enhances 
the possibilities for debugging. Unfortunately I don't know wether this is 
in conformance with the ODMG specification.

Johns second item shouldn't be forgotten as well.

regards
Joachim Sauer