NL Exception Trying To Connect To 10g RAC With JDBC

I'm trying to connect to multiple Oracle 10g databases (failover) over the JDBC thin client, and when I run the following, I get: java.sql. SQLException: Io exception: NL Exception was generated

connection = DriverManager.getConnection("jdbc:oracle:thin:@DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = dbdev) (PORT = 1521))) (CONNECT_DATA = (INSTANCE_NAME = orcldev)))", "scott", "tiger");

I eventually want to put multiple ADDRESSes in that string, but right now I'm trying to get it to work with just one! I've tried multiple variations of this, like changing INSTANCE_NAME to SID or SERVICE_NAME, and using the internal IP address for the HOST dbdev (see below). Here's the tnsnames.ora file used by SQL*Plus on the same client machine:

ORCLDEV.world =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.132)(PORT = 1521))
(CONNECT_DATA =
(SID = orcldev)
)
)