How to configure TAF on RAC 10g

Hi,
I am facing issue with TAF over jdbc client. I have created the jdbc client (HelloWorld java program) to test TAF.
The following is my jdbc url:
"jdbc:oracle:thin:@(DESCRIPTION = (LOAD_BALANCE=on)(FAILOVER=on)(ADDRESS_LIST= (ADDRESS=(PROTOCOL=TCP)(HOST=10.77.242.35) (PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=10.77.242.55)(PORT=1521))) (CONNECT_DATA=(SERVICE_NAME=dcnm)))"
Simply, i have created the connection through jdbc and put sleep in my code, meanwhile i down one of the db instance, then client code wake-up, but the connection is not failed over to another db instance. Please see below my tnsnames.ora file :
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
DCNM =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = dc3-linux1-vip.cisco.com)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = dc3-linux5-vip.cisco.com)(PORT = 1521))
(LOAD_BALANCE = yes)
(FAILOVER = true)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = dcnm)
*(FAILOVER_MODE =*
*(TYPE = SELECT)*
*(METHOD = BASIC)*
*(RETRIES = 180)*
*(DELAY = 5)*
DCNM2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = dc3-linux1-vip.cisco.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = dcnm)
(INSTANCE_NAME = dcnm2)
DCNM1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = dc3-linux5-vip.cisco.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = dcnm)
(INSTANCE_NAME = dcnm1)
LISTENERS_DCNM =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = dc3-linux5-vip.cisco.com)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = dc3-linux1-vip.cisco.com)(PORT = 1521))
Please give me your solution, if i missed anything in my conf.
Thanks
Edited by: Anandhan on Jul 27, 2009 12:38 AM

about jdbc thin + TAF
Oracle 10g JDBC/THIN Driver does not support TAF. TAF is only supported by the JDBC OCI driver.
http://download.oracle.com/docs/cd/B19306_01/java.102/b14355/ocitaf.htm#BABGIDEE
http://download.oracle.com/docs/cd/B28359_01/java.111/b31224/ocitaf.htm#BABGIDEE
Transparent Application Failover (TAF) is a feature of the Java Database Connectivity (JDBC) Oracle Call Interface (OCI) driver. It enables the application to automatically reconnect to a database, if the database instance to which the connection is made fails. In this case, the active transactions roll back.

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