Current development "Version 3 development master" involving a completely rewritten transpiler (2017) that nearly perfectly emulates the Java Virtual Machine, including fully qualified methods, compile-time method binding, generic methods and classes, Java reflection for efficient modular just-in-time class loading, Java Swing components, modal and nonmodel dialogs, audio, jpdf, the AWT event thread, and many other added packages. Java applications and applets can both be run in JavaScript in a browser.

Unlike Version 2, Version 3 requires minimal reworking of Java classes - primarily just for performance reasons, maximizing JavaScript performance without compromising any Java performance and making Java-to-JavaScript conversion almost trivial. (Of course, we are still finding occasional bugs in the transpiler and run-time "JavaScript-JVM.")

Ported from SourceForge by Zhou Renjian, developed further by Zhou Renjian and Udo Borkowski (primariy) as "Version 2.0".

Version 2 allowed extensive development of JavaScript versions of Java applets, including JSmol, Falstad applets, and PhET applets.

However, this version did not produce "fully qualified" method signatures, resulting in error-prone and performance-reducing run-time binding of methods. Java class loading procedures were not consistent with the seqence of events used by the Java class loader, and parameter and array typing was minimal. Thus, while functional, Version 2 was not fully generalizable and required extensive reworking of Java code to be "java2script compliant."

Synchronized with https://github.com/BobHanson/java2script as the stable master version in 2018.