——————————————————- You stated: java.sql.SQLException: ORA-12154: TNS:could not resolve service name —————————————————————— Most probable case: This may happen when a Java client requests a database connection but the database server has not started or not listening. Solution1. Make sure the service name in the host string is correct. e.g. jdbc:oracle:oci8:@kesdee.world Solution2. Start the Oracle Server Solution3. Start the Listener. Under MS-DOS: lsnrctl.exe start Soution4. The tnsname specified in jdbc url is incorrect, check if the names match in ORACLE_HOME/network/admin/tnsnames.ora Your problem must be solved by now:if not go down further!!!! ——————————————————————– If not solved yet:RUN THE FOLLOWING CHECKS: 1>You mustve missed some vital info in SQLNET.ORA: for egs: NAMES.DEFAULT_DOMAIN entry missed Due to which you cannot start the application and the T