This gets you knee deep into J2ME development with none of the main and all of the Maven 2 begotten gain.
The example application is a simple MIDlet with one Form.
To build it run mvn install and then deploy to your J2ME-ready handset (Bluetooth, serial cable, Over-the-Air) and try it out.
Of course, certain carriers have stricter protocols for this sort of thing than others: be prepared.