I have got a problem when I move a web application from jboss3.2.2 to jboss 3.2.5

When I try to retrieve a Clob field content from Oracle 8

ResultSet rs= st.executeQuery(SQLupdate);
rs.next();
Clob clob=((oracle.jdbc.driver.OracleResultSet)rs).getCLOB(1);

I experience the following exception:

11:45:50,437 ERROR [Engine] StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
java.lang.ClassCastException: org.jboss.resource.adapter.jdbc.WrappedResultSet


Do you have any ideas or clues that could help me.
Thanks.
U