Signing

Code signing is required for applications to run on devices (as opposed to simulators).

You can implement code signing from the Device Application Designer or the BlackBerry JDE:

Device Application Designer – the BlackBerry generation wizard includes a “Disable signing" option. If this option is unselected the wizard presents a signing dialog after compiling. This dialog allows you to input a sign key to sign the options and the client COD (.cod) file, so they can run on a physical device.
BlackBerry JDE – download the Signing Authority Tool from the BlackBerry Web site at http://na.blackberry.com/eng/developers/javaappdev/signingauthority.jsp. View Deploying and Signing Applications in the BlackBerry JDE plug-in for Eclipse at the Research In Motion Developer Video Library Web site: http://supportforums.blackberry.com/t5/Java-Development/tkb-p/java_dev%40tkb?labels=video.