A free Java Development Environment designed for beginners, used by millions worldwide. Find out more...

"One of my favourite IDEs out there is BlueJ"
— James Gosling, creator of Java.

Created by
Supported by

Download and Install

Version 5.3.0, released 20 March 2024 (Fixes and speed-ups, see more)


Requires 64-bit Windows, Windows 7 or later. Also available: Standalone zip suitable for USB drives.

Mac OS X

Requires OS X 10.12 or later.


Requires 64-bit, Debian buster or Ubuntu 18.10 or later. There is also a flatpak available (maintained by someone else).


Please read the Installation instructions. (Works on most platforms with Java/JavaFX 17 support).

Note: BlueJ now uses Java 11+, which requires a 64-bit operating system, which 95+% of users will have.
For 32-bit operating systems, download BlueJ 4.1.4 instead.
Download previous versions or old source code archives.
The source code for BlueJ is now available on Github.
The copyright for BlueJ is held by M. Kölling and J. Rosenberg.
BlueJ is available under the GNU General Public License version 2 with the Classpath Exception (full license text, licenses for third party libraries).

Useful Resources


"Objects First with Java: A Practical Introduction Using BlueJ" is a textbook co-written by the developers of BlueJ and has sold hundreds of thousands of copies worldwide.

Teacher support

Our free Blueroom website offers teaching resources and the chance to engage with other educators using BlueJ around the world.


Tutorials and reference materials for working in BlueJ.


We have several extensions available that add to BlueJ's base functionality.

Technical Support

If you have a technical issue with the BlueJ software itself (e.g. installation problems, failing to start, etc), you can view our FAQ, contact our technical support or view our bug database.


The BlueJ project is supported by Oracle. We benefit from an open source licence for JProfiler (a Java profiler).