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Java Comm API on Linux can't find

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I'm trying to set up the Java Communications API on Linux using the comm API from Sun (not rxtx), and I can't seem to get it to find my file. I've put comm.jar in $JDK_HOME/jre/lib/ext and the properties file in $JDK_HOME/jre/lib and $JDK_HOME/lib (using JDK 1.4.2_08).

I set my CLASSPATH to "$JDK_HOME/jre/lib/ext/comm.jar:BlackBox.jar" and when I try to run BlackBox, I get:
javax.comm: Error loading!
null javax.comm: platform driver class name = null
(Check 'driver' property in

at javax.comm.CommPortIdentifier.loadDriver(
at javax.comm.CommPortIdentifier.<clinit>(
at BlackBox.main(Unknown Source)
Exception in thread "main" java.lang.UnsatisfiedLinkError: isSessionActive
at com.sun.comm.SunrayInfo.isSessionActive(Native Method)
at com.sun.comm.Portmapping.registerCommPorts(
at com.sun.comm.Portmapping.refreshPortDatabase(
at javax.comm.CommPortIdentifier.<clinit>(
at BlackBox.main(Unknown Source)

Any idea what's wrong?
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