- Free Java implementations
Free Java implementations are software projects that implement Sun Microsystem's Java technologies and are distributed under
free software licences, thus making them free software. Sun released most of its Java source code as free software in May 2007, so it can now almost be considered a free Java implementation.
Java implementations include compilers, runtimes, class libraries, etc.
AdvocatesWho of free and open source software refer to free or open source
Java virtual machinesoftware as free runtimes or free Java runtimes.
Some advocatesWho in this movement prefer not to use the term "Java" as it has
trademarkissues associated with it. Hence, even though it is a "free Java movement", the term "free Java runtimes" is avoided by them.
Mid-90s to 2006
Probably the first free project to offer substantial parts of Java platform functionality was guavac, which began some time before November 1995. [cite web
title=Announcing: guavac 0.2.5, A free compiler for the Java language
accessdate=2007-06-24] [cite web
title=Changelog of guavac, showing the first release happening in January 1996
quote=Wed Nov 22 05:43:07 1995 [...] CompilerMain.C, Compiler. C, Compiler.h, lexer.l, parser.y: Initial revision]
Since then, the
free software movementdeveloped other java compilers, most notably the GNU Compiler for Java. Others include ECJ the Eclipse Java Compiler, which is maintained by the Eclipse Foundation, and Jikes, which is no longer actively maintained. With the upcoming GCC 4.3 release, GCJ (GCC for Java) will use ECJ parser front-end, for parsing Java. [cite web
title=GCC 4.3 Release Series -- Changes, New Features, and Fixes
Examples of free runtime environments include
Kaffe, SableVM, and gcj. GNU Classpathis the main free software class library for Java. Most free runtimes use GNU Classpath as their class library.
In May 2005,
Apache Harmonywas announced, however, the project chose the Apache License, which was at the time incompatible with all existing free Java implementations.
Another event in May 2005 was the announcement that OpenOffice.org 2.0 would depend on Java features which free software implementations couldn't provide. Red Hat solved this problem by extending the free software implementations to be adequate for their purposes.
Notable applications that already worked with free software Java implementations before November 2006 include
OpenOffice.organd Vuze, both of which work when compiled with GCJ.
un's November 2006 announcement
13 November 2006, Sun released its compiler, javac, under the GNU General Public License.
As of September 2007, as well as javac, Sun has released the code of
HotSpot(the virtual machine) and almost all the Java Class Libraryas free software.
Following their promise to release a fully buildable JDK based almost completely on free and open source code in the first half of 2007 [ [http://www.sun.com/software/opensource/java/faq.jsp#b4 OpenJDK FAQ] ] , Sun released the complete
source codeof the Class library under the GPL on May 8, 2007, except some limited parts that were licensed by Sun from 3rd parties who did not want their code to be released under a free software licence. [cite web
title=Open JDK is here!
accessdate=2007-05-09] Sun has stated that it aims to replace the parts that remain proprietary and closed source with alternative implementations and make the class library completely free and open source. Since there's some encumbered code in the JDK, Sun will continue to use that code in commercial releases until it's replaced by fully-functional free and open-source alternatives.
After the May 2007 code release
As of May 2008, the only part of the Class library that remains proprietary and closed-source (4% as of May 2007 for OpenJDK 7 [cite web
title=Plans for OpenJDK
accessdate=2007-05-22] , and less than 1% as of May 2008 and OpenJDK 6cite web
title=OpenJDK to replace IcedTea in Fedora 9
accessdate=2008-04-05] cite web
title=OpenJDK in Fedora 9!
quote="Thomas Fitzsimmons updated the Fedora 9 release notes source pages to reflect that Fedora 9 would ship with OpenJDK 6 instead of the IcedTea implementation of OpenJDK 7. Fedora 9 (Sulphur) is due to release in May 2008."
accessdate=2008-04-05] ) is [cite web
title=Plans for OpenJDK
accessdate=2007-10-09] cite web
title=OpenJDK 6 b10 source posted
* The SNMP implementation.
Since the first May 2007 release,
Sun Microsystems, with the help of the community, has released as Open-source or replaced with Open-source alternatives almost all the encumbered code:
* All the audio engine code, including the software synthetizer, has been released as Open-source [ [http://openjdk.java.net/projects/audio-engine/ audio-engine project page] ] . The closed-source software synthesizer has been replaced by a new synthesizer developed specifically for OpenJDK called "Gervill" [cite web
title=Gervill - Software Synthesizer
cryptographyclasses used in the Class library have been released as Open-source [cite web
title=Crypto has been added to OpenJDK
* The code that scales and rasterizes fonts has been replaced by
FreeType[ [http://openjdk.java.net/projects/font-scaler/ font-scaler projectpage] ] [http://openjdk.java.net/groups/2d/ Java2D project page] ] [cite web
title=Freetype font rasteriser
* The native
color managementsystem has been replaced by LittleCMS. There is a pluggable layer in the JDK, so that the commercial version can use the old color management system and OpenJDK can use LittleCMS.
anti-aliasinggraphics rasterizer code has been replaced by the Open-sourced Pisces renderer used in the phoneMEproject [ [https://phoneme.dev.java.net/ phoneme.dev.java.net/] ] [ [http://openjdk.java.net/projects/graphics-rasterizer/ graphics-rasterizer project page] ] . This code is fully functional, but still needs some performance enhancements [cite web
title=Open Source rasterizer
Because of these encumbered components, it was not possible to build
OpenJDKonly with Free Software components. In order to be able to do this before the whole class library is made free, and to be able to bundle OpenJDKin Fedora Core and other free Linuxdistributions, a project called IcedTeahas been started by Red Hat. It is basically an OpenJDK/ GNU Classpathhybrid that can be used to bootstrap OpenJDK using only Free Software. [cite web
title=Experimental Build Repository at icedtea.classpath.org
accessdate=2007-06-09] [cite web
title=Experimental Build Repository at icedtea.classpath.org
As of March 2008, the Fedora 9 distribution has been released with OpenJDK 6 instead of IcedTea. Some of the stated reasons for this changes are:
* Sun has replaced most of the encumbrances for which IcedTea was providing replacements (there is less than 1% of encumbered code in the class library, and this code is not necessary to run OpenJDK).
* OpenJDK 6 is a stable branch, whereas OpenJDK 7 is unstable and not expected to ship a stable release until 2009.
* Sun has licensed the OpenJDK trademark for use in Fedora.
June 2008, it was announced that IcedTea6 (as the packaged version of OpenJDK on Fedora 9) has passed the Technology Compatibility Kittests and can claim to be a fully compatible Java 6 implementation [cite web
title=Java is finally Free and Open
Java (software platform)
GNU Classpath, GCJ, and GIJ
List of Java virtual machines
* [http://www.gnu.org/philosophy/java-trap.html Free But Shackled - The Java Trap]
* [http://developer.classpath.org/support/ Escaping the Java Tr
* [http://www.infoq.com/news/2007/06/openjdk-hybrids Hybrids Combine GNU Classpath and OpenJDK]
* [http://meetings-archive.debian.net/pub/debian-meetings/2007/debconf7/low/115_State_of_the_Coffee_Cup.ogg Hour long 2007 video of a workshop with Sun, GGJ, and GNU Classpath developers]
* [http://wiki.debian.org/Java/ResolveJavaNaming Java Trademark Issues]
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