[dathinab]

It's a bit of a question about what you define the term "JVM" as. For many people it just means the thing which runs bytecode java was compiled to, in which case the Android runtime (ART) is a JVM (it has AOT, JIT and can run bytecode prodced from Java if done so in the right way).

But a more nit-picky/correct definition would expect the JVM to follow various specs (e.g. expect the bytecode the have exact the same format, features etc. as the one you find in a classical java application) and have various features which do not apply to the ART at all.

Or in other words, people which have nothing to do with java might call the ART a JVM in a generic way but people which do might be for good reason very insistent that this isn't the case. (Also Google lawyer will be VERY insistent it's no a JVM.)

[pjmlp]

Which is a kind of nit picking for Google laywers, as the approach taken by Dalvik/ART has been quite common in the embeded space, see PTC, Aicas, Aonix, microEJ, Websphere Real Time,...

Not all of them are available, however all of them do support AOT compilation, and their own bytecode format more optmized for their use cases than regular .class files.

The big difference between them and Google, is that they always played by the Sun/Oracle rules regarding Java licensing.