After using RXTX for a number of different projects, I\'ve come across many annoying discrepancies and issues that can only sensibly be put down to bugs in the library - dea
There's serial-comm too.
Serial communication in Java is a mess. I've had trouble with jSSC with a virtual usb serial on linux, but with serial-comm it connected.
RXTX is a mess.
At least I think that now this SO question has all of the worth mentioning serial communication java libraries.