Jainja JVM with Cosmopolitan Libc

Cosmopolitan Libc is a very interesting library which makes it possible to make an executable independent of the OS (but not of the architecture which must be x86)  

 

So I tried to compile Jainja JVM with this C library. It was pretty easy, apart from a few name collisions in headers.

 

There is now a JVM whose binary code works under Windows, Linux, xBSD and MacOS without recompilation !  

Cosmopolitan libc focuses on text-based user interfaces but AWT/Swing should work through X11 / TCP (not tested yet).

Jainja JVM on MS-DOS and Minix 3.2.1

Jainja JVM on MS-DOS https://t.co/hf7lfrYqeC#java #jainja

— Guillaume Legris (@glegr1s) April 11, 2020

Jainja JVM works fine on Minix 3 and Java GUI toolkits are available (AWT/Swing, Codename One) https://t.co/iSFy7CbcMH #jainja #Java @minix3

— Guillaume Legris (@glegr1s) April 11, 2020

Jainja JVM running a LWUIT GUI on HelenOS

Jainja JVM on the Chrome Web Store

It was pretty easy to write a new graphical backend for Jainja using the Pepper Plugin API. So it's possible to write Java graphical user interfaces on NaCl now !

A demo is available on the Chrome Web Store.

Jainja on Google Native Client (NaCl)

#Jainja Java Virtual Machine can now be used with Google NaCl but not yet with #PNaCl (LLVM/newlib) pic.twitter.com/nJOuBi82ZX
— Guillaume Legris (@glegr1s) 26 Avril 2014

HelenOS

#Jainja Java Virtual Machine is now working on #HelenOS pic.twitter.com/ip0gwP2j03
— Guillaume Legris (@glegr1s) 22 Avril 2014

This port was not too hard thanks to the POSIX compatibility layer of HelenOS. The lack of some math libraries was filled by fdlibm. A package for HelenOS is available here

Jainja 0.8 released

Jainja is a JVM (Java Virtual Machine) written in Java. Focus is set on portability, not on performance. Jainja supports Java 1.5 features.

This release adds support for Minix, Haiku and Dart.

So Jainja currently works on Linux, Windows, xBSD, Minix, Haiku, Java SE, Android, GWT, and Dart

More infos