jdbc:oracle:thin:@[hostname]:[port]:[service_name]

jdbc:oracle:thin:@(DESCRIPTION=(FAILOVER=on)(CONNECT_TIMEOUT=5)(TRANSPORT_CONNECT_TIMEOUT=3)(RETRY_COUNT=3)
(ADDRESS_LIST=(LOAD_BALANCE=OFF)
(ADDRESS=(PROTOCOL=TCP)(HOST=<primary_db_hostname>)(PORT=<db_port>))
(ADDRESS=(PROTOCOL=TCP)(HOST=<secondary_db_hostname>)(PORT=<db_port>)))
(CONNECT_DATA=(SERVICE_NAME=<service_name>)))