Java Runtime Environement (JRE) must be installed on your machine.
If you think you've already installed it, check the directry:
Windows:
If the directory exists then you have JRE installed on your machine, otherwise, please download and install JRE. You can download it from this link: http://www.oracle.com/technetwork/java/javase/downloads/index.html

Accept and download version for your architecture:

On linux:
Just type java in comand prompt, and it'll tell you if it exists on your Linux machine. (Same for Mac OS X)
Once installed you have to add binaries path to your System Variables.
To add the value, copy the bin path of java installation folder:
Looks something like that: C:\Program Files\Java\jre7\bin
Go to: Control panel > System > On the side click on "Advanced system settings" > then click on the button named "Environment variables":

In the system variables frame, look for variable named path, then double click on it:
in vlaue field add the JRE bin path at the end, by separating with ";" from other values
like this: ;C:\Program Files\Java\jre7\bin

Now you can run java executables with command lines.
TIP: If you want to run the server in silent mode: just double click on Serv.jar file, and it will run the server on you local IP in silent mode
There is already a StartServer.bat script file which executes automatically the command to run the .jar Server (Serv.jar), just double click on it, and the server will start in terminal.

Just double click on StartServer.sh script and execute it in terminal:

Download the BlackBerry FREE App here: http://appworld.blackberry.com/webstore/content/104058/?lang=en
<img src="http://i.imgur.com/moQTO.png"
Once server started you can connect your Blackberry by using your local IP:
IMPORTANT: You must connect your blackberry on the same WIFI network as your machine running the Server
<img src="http://i.imgur.com/ulSwf.png"
Now you can send commands to your command prompt directly from your Blackberry:
Demontration video: http://www.youtube.com/watch?v=eAwK4lyt87w