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 3.1.7, released 23 February 2016 (what's new)
Windows
with Java 8 JDK
(recommended)
1. Oracle JDK
You can also download BlueJ as a standalone bundle (zip) which you can run from a USB stick.
Mac OS X
10.7.3 and newer:
BlueJ Installer
with Java 8 JDK
10.7.2 and older:
BlueJ Installer
(uses Apple Java 6 JDK, not recommended for newer systems)
Ubuntu/Debian
Raspbian Linux
BlueJ is now part of the Raspbian distribution, and it is already installed by default on the current Rasbperry Pi image.
To install or update BlueJ manually, and for tutorials, see the BlueJ on Raspberry Pi page.
Other Operating Systems
Preview Version
Version 4.0.0preview2, released 22 November 2016
Adds support for Stride, Git, automatic error highlighting, tabbed editors and more. Source code
Windows Standalone
Requires no installation, ideal for use on a USB stick.
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.
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 open source licences for JProfiler, a Java profiler and JIRA.