Free Java implementations: Difference between revisions

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{{Short description|None}}

{{Use mdy dates|date=March 2024}}

'''Free Java implementations''' are [[software]] projects that implement Oracle's [[Java (software platform)|Java]] technologies and are distributed under [[free software licences]], 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.<ref>{{Cite web|url=https://www.redhat.com/ko/blog/openjdk-and-the-icedtea-project|title=OpenJDK and the IcedTea Project|website=www.redhat.com|language=ko|access-date=2019-12-16}}</ref> Java implementations include compilers, runtimes, class libraries, etc. Advocates of free and open source software refer to free or open source [[Java virtual machine]] software as '''free runtimes''' or '''free Java runtimes'''.

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==Sun's November 2006 announcement==

On 13 November 13, 2006, Sun released its compiler, [[javac]], under the [[GNU General Public License]].<ref>[http://news.cnet.com/Sun-picks-GPL-license-for-Java-code/2100-7344_3-6134584.html Sun picks GPL license for Java code]</ref>

As of September 2007, as well as javac, Sun has released the code of [[HotSpot (virtual machine)|HotSpot]] (the [[virtual machine]]) and almost all the [[Java Class Library]] as free software.

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| url=http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85

| title=Javascript is encumbered and there is no javascript plugin support.

| publisher=[[IcedTea]]

| quote=''Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.''

| date=2008-03-11

| access-date=2008-06-01}}</ref>

| archive-date=2008-09-27

| archive-url=https://web.archive.org/web/20080927185957/http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85

| url-status=dead

}}</ref>

Because of these previously encumbered components, it was not possible to build [[OpenJDK]] only with free software components. In order to be able to do this before the whole [[Java Class Library|class library]] is made free, and to be able to bundle [[OpenJDK]] in [[Fedora (operating system)|Fedora Core]] and other free [[Linux]] distributions, [[Red Hat]] has started a project called [[IcedTea]]. It is basically an OpenJDK/[[GNU Classpath]] hybrid that can be used to bootstrap OpenJDK using only free software.<ref>{{cite web

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| url=http://developer.classpath.org/pipermail/classpath/2007-June/002109.html

| title=Experimental Build Repository at icedtea.classpath.org

| first=Mark
| last=Wielaard

| date=2007-06-07

| access-date=2007-06-09}}</ref>

| archive-date=2007-06-19

| archive-url=https://web.archive.org/web/20070619012918/http://developer.classpath.org/pipermail/classpath/2007-June/002109.html

| url-status=dead

}}</ref>

As of March 2008, the [[Fedora (operating system)|Fedora 9]] distribution has been released with OpenJDK 6 instead of the IcedTea implementation of OpenJDK 7.<ref name="fedora9redhat" /> Some of the stated reasons for this change are:

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In September 2013, Azul Systems released Zulu, a free, open source build of [[OpenJDK]] for [[Windows Server]] and the [[Microsoft Azure]] Cloud. Later releases added support for [[Mac OS X]], multiple versions of [[Linux]] and the [[Java Platform, Standard Edition]] version 8. Zulu is certified compliant with Java SE 8, 7 and 6 using the OpenJDK Community [[Technology Compatibility Kit]].<ref>{{Cite web|url=http://www.azulsystems.com/products/zulu|title = Core}}</ref>

[[Amazon (company)|Amazon]] have released [[Amazon Corretto]] a no-cost, multiplatform, production-ready distribution of the Open Java Development Kit. It is released under [[GPL]] v2 with the [[GPL linking exception#The classpath exception|Classpath Exception]]. Long -term support versions of Java 8 and Java 11 are available. It was first publicly released on 31 January 31, 2019.<ref>{{cite web|access-date=2019-07-25|title=Amazon Corretto 8 Now Generally Available|url=https://aws.amazon.com/blogs/opensource/amazon-corretto-8-generally-available/|date=31 January 31, 2019|website=Amazon Web Services|author=Arun Gupta}}</ref>

In 2017, the [[Eclipse Foundation]] released AdoptOpenJDK, now named [[Adoptium]], who'swhose main goal is "to promote and support [[free and open-source]] high-quality runtimes and associated technology for use across the [[Java (programming language)|Java]] ecosystem."

==See also==

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* [[Java (software platform)]]

* [[Javacjavac]]

* [[HotSpot (virtual machine)|HotSpot]]

* [[Apache Harmony]]

* [[OpenJDK]]

* [[GNU Classpath]], and [[GNU Compiler for Java|GCJ]], and [[GNU Interpreter for Java|GIJ]]

* [[IcedTea]]

* [[JamVM]]

* [[IKVM.NET]]

* [[List of Java virtual machines]]

* [[Comparison of Java virtual machines]]