TAF and JDBC connections

I have developers connecting to my RAC database with jdbc. I want them to use nodes 3 and 4. I have a TAF tnsnames set up for them as follows: This is the tnsnames on the server. However, JDBC does not use tnsnames. How do I get them to take advantage of this ? I can use this locally on my RAC boxes.

so what do I do with jdbc guys?

JAVAGUYS =
  (DESCRIPTION =
    (ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = node3-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = node4-vip)(PORT = 1521))
    )
    (CONNECT_DATA =
(SERVICE_NAME = JAVAGUYS)

    )
  )

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