If you're going to develop in Java ME, which doesn't have too many followers (see the small number of posts in this section - only about 10 per month) you really need to improve on your net searching skills aka googling.
Searching for
java me 3 SDK (a phrase copied from your post) gives many interesting results, and
this one starts off with an exact answer to your question.
Seriously, it's not just
faster to do your own research; when going through the results you will come across the answers to questions you haven't (yet) asked