JX (operating system)

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DeveloperUniversity of Erlangen
Source modelFree software
Final release0.1.1 / October 10, 2007; 12 years ago (2007-10-10)
Kernel typeMicrokernel
LicenseGPLv2 or later[1]
Official websiteJX Project

JX is a microkernel operating system with both the kernel and applications implemented using the Java programming language.[2]


JX is implemented as an extended Java virtual machine (the JX Core), adding support to the Java system for necessary features such as protection domains and hardware access, along with a number of components written in Java that provide kernel facilities to applications running on the computer. Because Java is a type-safe language, JX is able to provide isolation between running applications without needing to use hardware memory protection. This technique, known as language-based protection means that system calls and inter-process communication in JX does not cause an address space switch, an operation which is slow on most computers. JX runs on standard PCs, with support for a limited range of common hardware elements. It is Free software, developed by the University of Erlangen.[3][4]

The primary benefits of JX include:

  • a small trusted computing base (TCB) results in a high security system
  • lack of address space switching enables high performance compared to most microkernel systems

See also[edit]


  1. ^ http://www4.cs.fau.de/Projects/JX/license.html
  2. ^ Michael Golm; Meik Felser; Christian Wawersich; Jürgen Kleinöder. "JX - A flexible Java Operating System (poster)". University of Erlangen. Retrieved 2007-04-21.
  3. ^ "JX: the fast and flexible Java OS". University of Erlangen. Retrieved 2007-04-21.
  4. ^ Golm, Michael; Meik Felser; Christian Wawersich; Jürgen Kleinöder (13 June 2002). "The JX Operating System". Proceedings of the 2002 USENIX Annual Technical Conference. Monterey, CA: USENIX. Retrieved 2007-04-21.

External links[edit]