Excelsior JET

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Excelsior JET
Developer(s) Excelsior LLC
Initial release 2000 (2000)
Stable release 11.0 MP1 / December 7, 2015 (2015-12-07)
Development status Active
Written in Modula-2, Oberon-2, Java, Scala, C++, Assembly
Operating system Windows, OS X and Linux
Platform IA-32 and AMD64
Type Ahead-of-Time (AOT) native code compiler, runtime, and deployment toolkit for Java applications
License EULA
Website http://www.ExcelsiorJET.com

Excelsior JET is a proprietary Java SE technology implementation built around an ahead-of-time (AOT) Java to native code compiler. The compiler transforms the portable Java bytecode into optimized executables for the desired hardware and operating system (OS). Also included are a Java runtime featuring a just-in-time (JIT) compiler for handling classes that were not precompiled for whatever reason (e.g. third-party plugins or dynamic proxies), the complete Java SE API implementation licensed[1] from Oracle, and a toolkit to aid deployment of the optimized applications.


Excelsior JET has passed the "official" test suite (TCK) for Java SE 8, and is certified Java Compatible on OS X and a number of Windows and Linux flavors running on Intel x86, AMD64/Intel 64 and compatible hardware. (The OS X version is 64-bit only.)

The Enterprise Edition supports the Equinox OSGi runtime at the JVM level, enabling ahead-of-time compilation of Eclipse RCP (Rich Client Platform) applications,[2][3] and version 7.0 added such support for Web applications running on Apache Tomcat.[4][5]

Excelsior JET Embedded[6] implements the Java SE for Embedded technology in a very similar manner, the only major differences are in licensing and pricing.

Latest Release[edit]

Version 11 is mostly about the move to Java SE 8. JavaFX 8 is also supported.

Version 10.5 introduced a new garbage collector optimized for multi-core and multi-CPU systems[7]

See also[edit]


  1. ^ "Java SE Licensees". Oracle Corporation. Retrieved 17 Jul 2012. 
  2. ^ Craig Wickesser (23 Jul 2009). "Commercial Java Compiler Protects Eclipse RCP Applications". InfoQ. 
  3. ^ Dana Blankenhorn (1 Aug 2008). "Excelsior JET from Russia, with love". ZDNet. Retrieved 22 May 2012. 
  4. ^ Brittain, Jason; Darwin, Ian F. "Section A.7. Excelsior JET". Tomcat: The Definitive Guide (Second ed.). O'Reilly Media, Inc. ISBN 978-0-596-10106-0. 
  5. ^ Cameron McKenzie (20 Apr 2010). "Forget the JOP. Just Compile Your Tomcat War Files into Native Code". TheServerSide. Retrieved 22 May 2012. 
  6. ^ William Wong (23 Jul 2012). "Java Tool Slims Down Embedded Runtime". Electronic Design. 
  7. ^ John K. Waters (11 Feb 2015). "JET Update Amps Garbage Collection". Application Development Trends. 

External links[edit]