Hi Patrick,
I'm working with a XWiki Enterprise 2.3 on tomcat
and Oracle 10;
Since 2 or 3 days, when we upload a new file to a page , the file is
available during 1 min then the file size change to 0kb ;
It is not directly related, but I have seen a similar effect when using XWiki with
a mySQL DB, which had a far too small "max_allowed_packet" config on the mySQL
server.
Somehow an error was generated in the DB Server, but not properly propagated to the
application.
Maybe there is something similar in your case, even though the DB Server is different.
There should be an error on the DB Server in that case.
Hope this helps,
Clemens