Java CLASSPATH

I want to deploy a JDBC driver for XI 3.0 from http://jtds.sourceforge.net/. The installation there says: "Just drop the jar file into your application's classpath and you're done."

The SAP help says the following:

"Additionally for the JDBC adapter

A JDBC driver installation (version 2.0) for the database product to be connected to. The required Java libraries are product-specific and can be obtained from either the database vendor or other providers. The Java libraries must be located in the Java CLASSPATH following installation so that the JDBC adapter can access the required Java classes at runtime."

I've been looking all over for this Java CLASSPATH, but I can't locate it anywhere. I've copied the .JAR file into several XI directories containing JAR files, restarted XI, but without any success.

Does anyone out there know where to find the Java CLASSPATH for XI?