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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 
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Version 4.2.2, released 4 October 2025 (fixes extra space in terminal, Submitter preferences, and more)
Windows
Requires 64-bit Windows, Windows 7 or later. Also available: Standalone zip suitable for USB drives.
bluelight安卓版
bluelight安卓版
Ubuntu/Debian
Requires 64-bit, Debian buster or Ubuntu 18.10 or later. Please read the Installation instructions.
Other
Please read the Installation instructions. (Works on most platforms with Java/JavaFX 11 support).
For 32-bit operating systems, download BlueJ 4.1.4 instead.
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).
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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
We have several extensions available that add to BlueJ's base functionality.
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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 bluelight安卓免费下载.
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The BlueJ project is supported by Oracle. We benefit from open source licences for JProfiler (a Java profiler) and JIRA.