Jump (isn't exactly a JVM, but a an Ahead-Of-Time compiler running on your desktop, producing a stand-alone program) is open source.
Jump-compiled programs are fast (5-10 times faster than typical VMs), but lack some of the dynamic features of Java (e.g. no dynamic class loading with Class.forName()).
Jump's mem footprint isn't bad. Small programs with PalmOS-style GUI start at 10 KB. (Remember, no additional VM or library needed!).
On the other hand, Jump has a multi-segment mode and a (still experimental) huge-heap mode. Programs of 300K using 500K of heap are no problem.
With the WabaJump library, you can use a well-designed, AWT-like GUI framework, compatible with Waba.
Jump tries to support the full Java2 standard (in the future). By now, it supports:
- all data types (including long, float
- most classes and methods from
java.lang and java.util
- virtually everything that you have in form
of java source or pure-java classfiles.
Jump has its own discussion group at
Download site is:
--- Ralf Kleberhoff <firstname.lastname@example.org>
(maintainer of Jump)