The simplest way to correct this is to overwrite the.jar included with TeamForge with the one from $ORACLE_HOME.
TeamForge uses the thick Oracle JDBC driver, which has two parts. One of these is provided by TeamForge, the other is in $ORACLE_HOME. If these two components are incompatible, TeamForge will be unable to make a connection to the database.
Follow these steps to overwrite the.jar included with TeamForge with the one from $ORACLE_HOME:
cp $ORACLE_HOME/jdbc/lib/ojdbc14.jar
/opt/collabnet/teamforge/jboss/jboss-3.2.6/server/default/lib/
A restart of the application will be required to use the new.jar.