Trying to connect to NXT over java bluetooth api

[NadirHajiyev]

Hello.
I want to improve my skills on leJOS.
So I decided to write my own program to connect my PC to NXT.
I researched and find out that for connecting over bluetooth in Java I need to install javax.bluetooth.* and javax.microedition.io.*. But i cannot find any source to download it.
Can you help me guys?
Thanks.