Retrieving Large object

Hi

i have the follwoing problem. I serving files out of
a postrgesql database version 7.1.2. I am connected
to the db with the jdbc 7.1-1.2. If the file to serve is text
like html everything works fine. But serving a image
results in nothing. Thats mean my programms read zero
bytes from the database. Why does it work with text files
and not with binary files???

Max