Reading data from Serial port
Please see:
http://www.intellog.com/blog/?p=255 and http://www.coderanch.com/t/535173/Streams/java/CommPortIdentifier-getPortIdentifiers-empty (the latter points to the first)
Oracle does not offer the binaries for windows (assuming that you're on windows): http://www.oracle.com/technetwork/java/index-jsp-141752.html
Auto detecting serial COM port from VendorID, ProductID in Java
The USB abstraction library libusbp comes with an example program named lsport that lists all USB device and the serial ports they have. You could compile that program and run it from your Java program, or just study how it works and reimplement the same thing in Java.
For Linux, another idea is to look at the symbolic links in /dev/serial/by-id.
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