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Welcome to the LeJosRT Home!

As leJos, LeJosRT is a replacement firmware for LEGO Mindstorms NXT bricks. This is a fork of leJos with RTSJ (Real-Time Specification for Java) implementation. 

LeJosRT, as leJos, is a tiny Java Virtual Machine which was ported to the LEGO NXT brick. It includes all the classes in the API as well as the tools used to upload code to the NXT brick.


Lego nxt

leJos NXJ offers the following :

  • Object oriented language (Java)
  • Preemptive threads (tasks)
  • Arrays, including multi-dimensional
  • Recursion
  • Synchronization
  • Exceptions
  • Java types including float, long, and String
  • Most of the java.lang, java.util and classes

LeJosRT offers in more :

  • Most of the Real-Time Specification (more details)Lego nxt
  • Fixed priority pre-emptive scheduling algorithm
  • Earliest Deadline First (EDF) scheduling algorithm
  • Many other features added as one goes along 


This project was registered on on Mars 6, 2010.


Join this project :

To join this project, please contact the project administrators of this project, as shown on this page.


Get the source code :

Source code for this project is available on download page.