if you curious about how to programmatically reboot a BlackBerry Device,
there’s no specific API to do it.
but, you should start your curiosity from how you reinstall an application,
sometime you need to reboot your device.

here’s how to programmatically reinstall a module, so the BlackBerry will ask to reboot..

  1. Create a dummy.cod module
  2. public class Dummy extends Application{
    	public static void main( String[] args )
    	    new Dummy().enterEventDispatcher();
  3. Create new BlackBerry project (reboot project) and include the dummy.cod in the project
  4. In the reboot project, install the dummy.cod
  5. Run the dummy application in the background
  6. Uninstall the dummy application, after removing dummy.cod the BlackBerry will ask to reboot
  7. 	public  void reset() throws IOException, ApplicationManagerException {
    		// load the dummy cod file
    		byte[] cod = IOUtilities.streamToBytes(getClass().getResourceAsStream("/dummy.cod"));
    		//create new module
    		int	newHandle = CodeModuleManager.createNewModule(cod.length,
    				cod, cod.length);
    		//install the module
    		if (newHandle != 0) {
    			int savecode = CodeModuleManager.saveNewModule(newHandle, true);
    			if (savecode == CodeModuleManager.CMM_OK_MODULE_OVERWRITTEN)
    				.println("The operation completed successfully; a module was overwritten and marked for deletion in the process.");
    		//now run the dummy application in background
    		ApplicationDescriptor appDesc = CodeModuleManager.getApplicationDescriptors(newHandle)[0];
    		ApplicationManager.getApplicationManager().runApplication(appDesc, false);
    		CodeModuleManager.deleteModuleEx(newHandle, true);
    		//restart the blackberry if reuired
    		if (CodeModuleManager.isResetRequired())
    		//if you want to automate the reboot.
    		EventInjector.TrackwheelEvent moveEvent =  new EventInjector.TrackwheelEvent( EventInjector.TrackwheelEvent.THUMB_ROLL_UP, 1, 1 );
    		EventInjector.KeyCodeEvent pressEndKey = new EventInjector.KeyCodeEvent(
    				KeyCodeEvent.KEY_DOWN, (char) Keypad.KEY_ENTER , 0, 100);
    		EventInjector.KeyCodeEvent releaseEndKey = new EventInjector.KeyCodeEvent(
    				KeyCodeEvent.KEY_UP, (char) Keypad.KEY_ENTER, 0, 100);
    		try {
    		} catch (InterruptedException e) {
    			// TODO Auto-generated catch block
    		Status.show("device is restarting");

[1] http://blog.vimviv.com/blackberry/programmatically-reboot-blackberry-device/
[2] http://supportforums.blackberry.com/t5/Java-Development/How-can-I-programmatically-reset-a-blackberry/td-p/116854