now it works :-)
I used the ojdbc14.jar Driver without success, but the ojdbc14_g.jar-Driver does it's work.
sounds fishy. _g.jar is just the same driver compiled with javac -g ....
I have seen this problem before with an oracle oc4j container. the problem turned out to be a buffer on the oracle jdbc driver that has a 2k size limit. try tracing this in debug and decompile the driver classes. sorry i couldn't remenber the name of the offending class.
hope this helps.