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Namely, JEP 315: Improve Aarch64 Intrinsics (contributed by BellSoft ), JEP 318: Epsilon: A No-Op Garbage Collector (by Red Hat) and JEP 331: Low-Overhead Heap Profiling (contributed by Google). 83.

Sun previously indicated that they would try to open-source these components, but neither Sun nor Oracle have done so.

The only currently available free plugin and Web Start implementations as of 2016 update are those provided by IcedTea.

Due to the encumbered components in the class library and implicit assumptions within the build system that the JDK being used to build OpenJDK was a Sun JDK, this was not possible.

To achieve openness, Red Hat started the IcedTea project in June 2007.

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It began life as an OpenJDK GNU Classpath hybrid that could be used to bootstrap OpenJDK, replacing the encumbrances with code from GNU Classpath.

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IcedTea provided free software alternatives for the few remaining proprietary sections in the OpenJDK project.

It was also the first to use OpenJDK for the package name (via the OpenJDK trademark agreement ) instead of IcedTea.

Ubuntu also first packaged IcedTea7 43 before later moving to IcedTea6.

Packages for IcedTea6 were also created for Debian and included in Lenny.

On July 12, 2008, Debian accepted OpenJDK-6 in unstable, 44 45 and it is now in stable.

OpenJDK is also available on openSUSE, 47 Red Hat Enterprise Linux and RHEL derivatives such as CentOS.

Google has been in an ongoing legal dispute with Oracle over claims of copyright and patent infringement through its use of re-implementations of copyrighted Java APIs via Harmony.

While also stating that this change was to create a more consistent platform between Java on Android and other platforms, the company admitted that the switch was motivated by the lawsuit, arguing that Oracle had authorized its use of the OpenJDK code by licensing it under the GPL.

Sun stated that it planned to replace the remaining proprietary components with alternative implementations and to make the class library completely free.

Each encumbrance 63 was either released as free and open-source software or replaced with an alternative.

Beginning in December 2010, all the so-called binary plugs were replaced by open-source replacements, making the whole JDK open sourced and the binary plugs not necessary anymore.

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The BSD porting project led by Kurt Miller and Greg Lewis and the Mac OS X porting project (based on the BSD one) led by Landon Fuller have expressed interest in joining OpenJDK via the Porters Group.

As of January 2008, both are part of the mailing list discussions.

Another project pending formalization on the Porters Group is the Haiku Java Team led by Bryan Varner.

Initially, the external patch submission process was slow 71 and, until September 2008, commits to the codebase were only made by Sun engineers.

The process has improved and, as of 2010 update, simple patches and backports from OpenJDK 7 to OpenJDK 6 can take place within hours rather than days.

Zulu is available as a free download from the community site Zulu.org.

It is also possible to get Zulu on Amazon Web Services 77 via Canonicals Juju Charm Store, 78 the Docker Hub, 79 and Azul Systems repositories.

Azul contributes bug fixes and enhancements back to the OpenJDK project and has several project committers on staff.

OpenJDK 11, released in September 2018, received 20 of external fixes 82 and brought 17 new JEPs (features), out of which 3 were contributed by the community.

Namely, JEP 315: Improve Aarch64 Intrinsics (contributed by BellSoft ), JEP 318: Epsilon: A No-Op Garbage Collector (by Red Hat) and JEP 331: Low-Overhead Heap Profiling (contributed by Google).

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