[Rxtx] port in use exception

[Dr. Douglas Lyon]

Hi All,
For the longest time, I was using RXTX to dial the phone.
Recently, I switched to the PortIO device (USB to Serial converter).

If I quit from the application and restart, I get an exception, as seen
below, on the Mac. However, trying again seems to work fine.
As long as the application remains open, everything works well.

I do close the port when I am done.
Hmm. I am using a odd-ball version of RXTX, as you can see.
This could be the culprit. Any ideas?
Thanks!
  - Doug

Native lib Version = R-testing-XTX-2.1-7pre20noLock
Java lib Version   = R-testing-XTX-2.1-7pre20noLock
trying to open:/dev/tty.usbserial
gnu.io.PortInUseException: Unknown Application
	at gnu.io.CommPortIdentifier.open(CommPortIdentifier.java:335)
	at serialPort.Utils.init(Utils.java:62)
	at serialPort.Utils.<init>(Utils.java:37)
	at serialPort.Utils.getSerialPortUtils(Utils.java:101)
	at gui.touchtone.DialUtils.doModemDial(DialUtils.java:70)
	at addbk.JAddressBook.ViewPanel.dial(ViewPanel.java:141)
	at addbk.JAddressBook.ViewPanel.access$300(ViewPanel.java:20)
	at addbk.JAddressBook.ViewPanel$11.run(ViewPanel.java:127)
	at gui.run.RunButton.actionPerformed(RunButton.java:45)
	at 
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
	at 
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202)
	at 
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
	at 
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
	at 
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
	at 
java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
	at java.awt.Component.processMouseEvent(Component.java:5554)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
	at java.awt.Component.processEvent(Component.java:5319)
	at java.awt.Container.processEvent(Container.java:2010)
	at java.awt.Component.dispatchEventImpl(Component.java:4021)
	at java.awt.Container.dispatchEventImpl(Container.java:2068)
	at java.awt.Component.dispatchEvent(Component.java:3869)
	at 
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256)
	at 
java.awt.LightweightDispatcher.processMouseEvent(Container.java:3936)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866)
	at java.awt.Container.dispatchEventImpl(Container.java:2054)
	at java.awt.Window.dispatchEventImpl(Window.java:1774)
	at java.awt.Component.dispatchEvent(Component.java:3869)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
	at 
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
	at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
	at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)