Trouble reading serial port using Java ("Could not find COM port")

Projects Interfacing w/ Software on the Computer
1

Hey everyone,
I followed this (Arduino Playground - Java) tutorial. I am using Linux, Ubuntu 11.04. The program compiled successfully and I have changed the PORT_NAMES to include "/dev/ttyACM0" which is my Arduino port.
However, when I run the program, it says:

c0dehunter@c0de-box2:~/Desktop$ java SerialTest
Experimental:  JNI_OnLoad called.
Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7
Could not find COM port.
Started
c0dehunter@c0de-box2:~/Desktop$

Obviously the port cannot be found, but why? What am I doing wrong?

2

Ok, found the solution.
I installed the latest version of RXTX lib (from synaptic). Then I had problem because Serial port was not recognised. I spent the last 2 hours finding out what the problem is and reinstalling alot of stuff. Then I found out I had to create a symlink from /dev/ttyACM0 to /dev/ttyUSB0. I also add myself to group uusd in /etc/group file. Now everything works :wink:

3

Hey

I'm facing similar issues with Eclipse on Ubuntu. I installed rxtx using

sudo apt-get install librxtx-java

It says it's up to date. I think I need to do what you did. Can you post details of how you did everything?

Thanks