The javabrowser is designed for the purpose of inspecting class structures and not for launching java executables. You can launch a java program by opening the Terminal.app then navigating to the directory of interest an entering, assuming that you want to run program.class
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username% java program arguments
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For the app at hand the author created a nice bash shell script to launch it.
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username% sh ./startLogger.sh
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Before you do that, you need to configure its settings, per the included README.html.
As far as turning it into a useful app with a nice GUI, it's absolutely possible. It just requires some free time etc. etc.
[ 03-03-2002: Message edited by: DaGuy ]