I just wanna say, i love java. Its provide anything for life connectivity. Java is flexibility and enjoyment metter. For microblogging on java mobile phone, just use twim, a twitter client for java phone, its pure java application for mobile (support Java MIDP 2.0). Twim lets you browse twitter twits from the archive/history, replies, friends, direct messages and public timelines. Links on the twits can be accessed using your mobile phone web browser.
Twim twitter client also support wifi connectivity, so you can free access microblogging without GPRS or 3G networks. Twim created by Tommi Laukkanen, you can donwload here (jar file)