Used LDAP adapter to resolve the alias
Attempting to contact (DESCRIPTION=(ADDRESS_LIST=(LOAD_BALANCE=OFF)(FAILOVER=ON)
(ADDRESS=(PROTOCOL=TCP)(HOST=tst-db1.myco.com)(PORT=1604))
(ADDRESS=(PROTOCOL=TCP)(HOST=tst-db2.myco.com)(PORT=1604)))(CONNECT_DATA=
SERVICE_NAME=mydb1.myco.com)(SERVER=DEDICATED)))
OK (80 msec)

jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(LOAD_BALANCE=OFF)(FAILOVER=ON)
(ADDRESS=(PROTOCOL=TCP)(HOST=tst-db1.myco.com)(PORT=1604))
(ADDRESS=(PROTOCOL=TCP)(HOST=tst-db2.myco.com)(PORT=1604)))
(CONNECT_DATA=(SERVICE_NAME=mydb1.myco.com)(SERVER=DEDICATED)))

testi=(DESCRIPTION =
(ADDRESS_LIST=
 (ADDRESS= (PROTOCOL = TCP)(HOST = scan-ip-or-name)(PORT = 1521))
 (FAILOVER = on)
 (LOAD_BALANCE = on)
)
(CONNECT_DATA=
 (SERVICE_NAME = testi)
) )

jdbc:oracle:oci:@(DESCRIPTION=(FAILOVER=on)(ADDRESS=(PROTOCOL=TCP)(HOST=**mi.host**)(PORT=**1521**))(LOAD_BALANCE=yes)(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=**serviceName**)))