Solution to gnu.io.PortInUseException (on Mac OS X)

[Kees de Kooter]

While trying to make the plugwise binding work I encountered the gnu.io.PortInUseException. 

I found the solution here: http://playground.arduino.cc/Interfacing/Java. It is a locking issue of the RXTX library and can be solved by following these steps:

"1. The RXTX library places its lock files in the folder /var/lock - which sometimes does not exist. Open terminal and Create the lock directory (as root) by using the following command:

 
sudo mkdir /var/lock

And enter your root password when prompted.

2. The appropriate permissions need to be applied to the /var/lock directory to allow the program to be run without being root. It is necessary to make sure you're in the group uucp and make sure the directory has group write permissions to uucp. Replace ‘username’ with your profile user name.

 
sudo dscl . -append /groups/_uucp GroupMembership username 
sudo chgrp uucp /var/lock 
sudo chmod 775 /var/lock"

Or by running the fixperm script found on http://jlog.org/rxtx-mac.html

[Kai Kreuzer]

This information is also available at the end of the wiki page of the serial binding: http://code.google.com/p/openhab/wiki/SerialBinding

Possibly not easy to find there, if you are just interested in the Plugwise binding ;-)

Regards,

Kai

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