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GNU Classpath Extensions
Unfinished free implementation of the Java extension libraries

The GNU Classpath Extensions project, aka classpathx builds free versions of Oracle's Java extension libraries, the packages in the javax namespace. It is a companion project of the GNU Classpath project.


Packages currently under development include javabeans activation framework, javabean infobus, java cryptology, java mail, jaxp, net extensions, and a servlet API.

Related Projects


LicenseVerified byVerified onNotes
License:GPLv2orlater with exceptionJanet Casey27 July 2001

Leaders and contributors

Paul Siegmann Contributor
Chris Burdess Maintainer
Andrew Selkirk Contributor
Chris Burdess Contributor
David Brownell Contributor

Resources and communication

AudienceResource typeURI
DeveloperVCS Repository Webview
Bug Tracking,Developer,
Savannah (Ref)

Software prerequisites

Required to buildjava compiler
Required to buildjava vm

This entry (in part or in whole) was last reviewed on 20 February 2018.


"Savannah (Ref)" is not in the list (General, Help, Bug Tracking, Support, Developer) of allowed values for the "Resource audience" property.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.