java != jvm implementacio
"To enable Java in resource constraint embedded systems, several projects implement the Java virtual machine (JVM) in hardware. These Java processors are faster than an interpreting JVM, but use fewer resources than a JIT compiler. Furthermore, the direct implementation of the JVM enables WCET analysis at bytecode level."
[..]
"With the introduction of the safety-critical Java specification the interest in Java processors might increase. Java processors execute bytecode, which itself is easier to analyze. Certification of safety-critical applications will benefit from the direct execution of Java bytecode as the additional translation steps to C and machine code are avoided."
http://www.jopdesign.com/publications.html
http://www.jopdesign.com/doc/chap_javahw.pdf
http://www.jopdesign.com/doc/lerosjvm.pdf
http://www.jopdesign.com/doc/scjreprap.pdf