RXTXcomm.jar causes conflict - Mac OS 10.5.7

Is there something I could change in preferences to make Arduino 16 ignore RXTXcomm.jar when it boots? The problem is an open-source program I wish to use in conjunction with Arduino REQUIRES /Library/Java/Extensions/RXTXcomm.jar to talk to its USB device.

When I remove the file, Arduino 16 boots OK and can find its board. I can then restore the file and boot the other program and it's OK. The two then run fine side by side.

Any thoughts?

Mike