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This is how I add and use RXTX in Eclipse for Win32 Projects, there are probably other ways but it works for me. [mailto:seaton@gateway.net.au]

# Copy RXTXcomm.jar, rxtxSerial.dll and rxtxParallel.dll files to the lib directory of your project
# Under Project | Properties | Java Build Path | Libraries
# click Add JARs... Button
# Select the RXTXComm.jar from lib directory
# Jar should now be in the Build Path
# expand the RXTXComm.jar entry in the list and select "Native Library Location"
# Select the project lib directory and apply

Be careful when using System.in.read() and rxtx in win32;  It can trip across a known JRE [http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4809647 deadlock] bug

Alternative way:

The above setup didn't quite work for me, so here is an alternative.

# Copy RXTXcomm.jar to the lib directory of your project
# Navigate your package explorer to the lib folder, right click on RXTXcomm.jar | Build Path | Add to built path
# Copy rxtxSerial.dll and rxtxParallel.dll files to the root directory of your project
# Under Run | Run configurations | Classpath tab | User entries | Advanced | Add folder, choose the root folder of your project
# This should be enough just to run it under Eclipse, when deploying a runnable jar, just make sure the dlls are on the same folder as the jar (JVM assumes it for classpath)