Embedded Java

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In discussions of J2ME Java specifications, such as the CDC/CLDC device capability sets and the MIDP profile definition, attention needs to be given to Embedded Java, which additionally requires very specialized, optimized JVMs, and the means to update the installed software and services such as OSGi.

A recent development in the field is the Squawk Virtual Machine, a JVM currently under development by Sun Microsystems and deployed as part of Project Sun SPOT.

The principal difference between Embedded Java and the several J2ME configurations is that the former is envisioned for use only in closed systems. That is, Embedded Java is for use in products that cannot be upgraded in the field. All of the Java code in these embedded systems is contained in flash memory. Thus the only class libraries that need to be present are the very methods and fields actually used by the Java application code; all the rest can be pre-stripped from the statically linked executable.

[edit] See also

GNU Compiler for Java
Excelsior JET, Embedded Edition
Sun SPOT Sun SPOT Project
http://www.parallax.com/ - Parallax's Javelin STAMP, similar to the Basic Stamp but utilising Java instead of Basic