Oddly, MIDP is required to support HTTP but not the lower level TCP/IP socket protocol it is based on. Some handsets support TCP/IP sockets.

CDC (Connected Device Configuration) is 2.5 meg and might be used in set top boxes. It is foundation for the Personal Basis Profile.

KVM is smaller still and is designed for use in PalmPilot type PDAs (Personal Digital Assistant pocket organisers), mobiles, watches, embedded devices with low powered CPUs and intermittent network connectivity (MP3 player, electronics in a car dashboard, etc.).

Personal Java was an earlier attempt and is now obsolete.

There are a set of APIs, starting from smallest to biggest, roughly they go: KVM (128K RAM), CLDC (160K RAM), MIDP 1.0 Profile (288K RAM), CDC (2MB RAM), MIDP 2.0 Profile, Personal Basis Profile, Personal Profile.

Books

	recommend book⇒Beginning J2ME: From Novice to Professional, Third Edition
		paperback
	ISBN10:	1-59059-479-7
	ISBN13:	978-1-59059-479-7
	publisher:	Apress
	published:	2005-04-25
	by:	Jonathan Knudsen and Sing Li
Includes code. Covers many topics from HTTPS to games to bluetooth to 3D. Recommended my Daryl Pierce, author of the J2ME FAQ.
amazon.ca amazon.com chapters.indigo.ca powells.com amazon.fr barnesandnoble.com amazon.de amazon.co.uk

	recommend book⇒Java 2 Micro Edition: Professional Developer’s Guide
		paperback
	ISBN10:	0-471-39065-8
	ISBN13:	978-0-471-39065-7
	publisher:	John Wiley & Sons
	published:	2000-11-17
	by:	Eric Giguère
A bit out of date.
amazon.ca amazon.com chapters.indigo.ca powells.com amazon.fr barnesandnoble.com amazon.de amazon.co.uk