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BlueJ
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 5.5.0, released 3 June 2025 (Many feature improvements, see more)
Windows
Requires 64-bit Windows, Windows 8 or later. Also available: Standalone zip suitable for USB drives.
macOS
Requires macOS 11 or later. Also available: A version for Macs with Intel processors (2021 and earlier) - see this link for how to tell which processor you have.
Ubuntu/Debian
Requires 64-bit Intel processor running Debian 11 or Ubuntu 20.04 or later. Also available: A version for ARM64 processors (e.g. Raspberry Pi).
Other
Please read the Installation instructions. (Works on most platforms with Java/JavaFX 21 support).
For 32-bit operating systems, download BlueJ 4.1.4 instead.
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
Textbook
"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.
Documentation
Tutorials and reference materials for working in BlueJ.
Extensions
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.
Acknowledgements
The BlueJ project is supported by Oracle. We benefit from an open source licence for JProfiler (a Java profiler).