rs232 serial port on xp

hi i am trying to receive some data from a rs232 serial port on a xp machine
...
i tried the javax.comm but on further reading my understanding is that this is no longer supported/working

so i got the rxtx jar, added it to the buildpath of the project and removed the references to the java.comm stuff....

now when i go to use it i can call

Code:

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import java.gnu.io;

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but i can't import the specific stuff that i need ie

Code:

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import gnu.io.CommPortIdentifier;
import gnu.io.NoSuchPortException;
import gnu.io.ParallelPort;

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from which id like to do stuff like

Code:

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try
  {
          //get the parallel port connected to the printer
          port = CommPortIdentifier.getPortIdentifier("COM1");

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would appreciate any help

thanks