SQLException from Postgres JDBC

Hi, everybody! I've got a problem with Postgres JDBC driver and perhaps somebody could help me. I'm using JDK 1.2.2, JSK 2.0, PostgreSQL 7.0.2 and Apache JServ 1.1.2 and my servlets throw a SQLException when I try to perform a INSERT or DELETE operation...

 

In fact, the operations are done but they don't return any results so a exception is catch by the servlet.

 

Does somebody know the way to avoid this?

 

Thanks in advance, Dani