It seems that Serial won't work with Intel compatible FTDI VCP drivers (I
comfirmed with v2.2.0).

http://www.ftdichip.com/Drivers/VCP.htm

Serial works fine with old drivers (I confirmed with v2.1.0).

Here are the error messages when tried to open a serial port:

Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7

RXTX Error: Unexpected lock file: /var/spool/uucp/LK.001.009.007
Please report to the RXTX developers
gnu.io.PortInUseException: Unknown Application

java.lang.RuntimeException: Error inside Serial.<init>()
at processing.gainer.Gainer.errorMessage(Gainer.java:666)
at processing.gainer.Gainer.<init>(Gainer.java:124)
at processing.gainer.Gainer.<init>(Gainer.java:85)
at Temporary_3440_7296.setup(Temporary_3440_7296.java:8)
at processing.core.PApplet.handleDisplay(PApplet.java:1269)
at processing.core.PGraphics.requestDisplay(PGraphics.java:535)
at processing.core.PApplet.run(PApplet.java:1152)
at java.lang.Thread.run(Thread.java:552)


Processing 0114
Mac OS X 10.4.6
iBook

*** This bug has been marked as a duplicate of 315 ***