The j2me applications come with a pair of file: a jad and a jar file. The Blackberry devices require application in a particular format: .cod file. Here, we'll describe a fast procedure to obtain a cod file from your midlet.

Before proceed be sure you have installed the Blackberry JDE (downloadable from the Blackberry developer website: download here) and the Java SDK from Sun (download here).

Here you are the steps:

• Move your JAD and JAR in the bin directory of the JDE installation folder (i.e. c:\program files\Research in Motion\Blackberry JDE 4.7.0\bin\ that will make easier the process from the command line);
  
• Open a DOS shell windows, go to the bin directory mentioned before and call the RAPC command: rapc import="c:\Program Files\Research in Motion\Blackberry JDE 4.7.0\lib\net_rim_api.jar" codename=myMidelt -midlet jad=myMidlet.jad myMidlet.jar. Use the name of your application instead of the myMidelt used in the previously written command line
• Now you have your cod file, use the javaloader (after you have linked your device to the pc through usb cable) to send the application to your phone: javaloader -usb load filename.cod