I have run Compiere251d with Oracle10g & Java 1.5 beta :-), and I am very nice. You have to make the step: 1.- Copy the $ORACLE_HOME/jdbc/lib/ojdbc14.jar to $COMPIERE_HOME/lib/oracle10g.jar 2.- Change into $COMPIERE_HOME/RUN_setup.sh in the -classpath oracle.jar for oracle10g.jar