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 4.1.4, released 29 October 2018 (fixes memory leak, click for details)


Requires Windows 7 or later. Also available: Standalone zip suitable for USB drives.

Mac OS X

Requires OS X 10.10 or later.


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

Download previous versions or source code
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.


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 open source licences for JProfiler (a Java profiler) and JIRA.