Java Developer's Guide v1.1: http://www.forum.nokia.com/info/sw.nokia.com/id/aca87303-e7ef-4a5a-9274-7e0973d52e94/Java_Developers_Guide_v1_1_en.pdf.html
This document can provide with a great start for any developer looking to exploit their Java skills in the mobile arena.
Take a look at this updated developer's guide. It provides an overview to the platforms, development tools and distribution mechanisms for apps created using Java™ technology for Nokia devices. It also emphasizes on the latest Nokia’s Touch and Type UI and how Java applications may take advantage of its features.