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ҪrxtxSerial.dllƵ<JRE>\bin<JDK>\binĿ¼£
RXTXcomm.jarƵ<JRE>\lib<JDK>\lib.

javax.usb.propertiesƵ<JRE>\lib<JDK>\lib.

If you want to use a serial port to a serial port communication, 
in addition to set up environment variables, 
you should copy "rxtxSerial.dll" to the "<JRE> \bin" directory or the "<JDK> \bin" directory; 
and copy "RXTXcomm.jar" to the "<JRE> \lib" directory or the " <JDK> \lib" directory.

and copy "javax.usb.properties" to the "<JRE> \lib" directory or the " <JDK> \lib" directory.