BlackBerry® Java® Development Environment (BlackBerry JDE)
BlackBerry JDE Component Pack
BlackBerry devices based on Java technology
BlackBerry Java SDK
When creating and building your application, it is important to choose the correct version of the BlackBerry® Java® SDK or BlackBerry JDE to make sure that the application is compatible with the target BlackBerry devices. Applications built in the BlackBerry Java SDK or BlackBerry JDE are forward-compatible with later BlackBerry® Device Software versions, but they are not backward-compatible with ealier versions.
For example, an application built in BlackBerry JDE 4.1 runs on a BlackBerry devices running BlackBerry Device Software 4.1 and later will not run on a BlackBerry device running BlackBerry Device Software 4.0. Thus, when building applications, you should use a BlackBerry JDE version that matches the lowest version of BlackBerry Device Software you want to support.
Note: To verify the version of BlackBerry Device Software installed on the BlackBerry smartphone, select Options > About.