11-20-2008 03:56 PM
If you use certain BlackBerry APIs, you have to get code signing keys and sign your .COD file(s) with them, before you will be able to install and run these applications on a BlackBerry device. I've written a tutorial will walk you through the process of getting the keys, and installing them to your JDE, and then deploying your application to a real device OTA (over the air).
Here's the tutorial on developerlife.com - http://developerlife.com/tutorials/?p=522.
You can get other BlackBerry tutorials on developerlife as well - http://developerlife.com/tutorials/?cat=63.