not only prod1,prod2 but also PROD ,sqlplus and pLsql can connect ,and userid have sysdba privilege.
but my app excute connection.open() throw exception ora-01031 ,
connstring="user id=scott;password=tiger;data source=PROD ;load balancing=true;"
oracle document says:
This feature can only be used with an Oracle RAC database and only if "pooling=true". If "Load Balancing=true" is set and the connection attempts to connect to a single-instance database, an OracleException is thrown with an error of "ORA-1031: insufficient privileges."