Java SE embedded: This is a large subset of the desktop version of the standard Java SE. It contains optimizations with respect to the standard edition, like size and memory usage, to adapt it to the needs of mid-sized embedded devices.

Java Micro Edition (ME): This is targeted at headless low- and mid-range devices, and is a subset of Java SE complying with the Connected Limited Device Configuration (CLDC), and including some extra features and tools for the embedded market. Oracle offers a couple of reference implementations, but Java ME will have to be individually integrated from source into specific platforms.