JX (operating system)

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

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


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


  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.
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