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

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.
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In order to bundle OpenJDK in Fedora and other free Linux distributions, OpenJDK needed to be buildable using only free software components. IcedTea and inclusion in software distributions IBM Java SDK (version 11 moved to IBM Semeru Runtime Certified Edition) Linux distributions have always offered their own builds.ĪdoptOpenJDK (moved to Eclipse as Eclipse Adoptium in 2021) ( November 2020)ĭue to Oracle no longer releasing updates for long-term support (LTS) releases under a permissive license, others have begun offering builds for Windows. Further details may exist on the talk page. Please expand the section to include this information. This section is missing information about presence of installer providing system integration (Windows registry, Mac framework, Linux MIME). Note that Red Hat resigned leadership of OpenJDK 6 at the beginning of 2017 and this was then taken up by Azul Systems.

The experimental -XX:+EnableJVMCIProduct flag enables the use of Graal JIT (JEP 317). OpenJDK 9+ supports AOT compilation ( jaotc) using GraalVM (JEP 295). The only currently available free plugin and Web Start implementations as of 2016 are those provided by IcedTea.

Sun previously indicated that they would try to open-source these components, but neither Sun nor Oracle have done so. The web-browser plugin and Web Start, which form part of Oracle Java, are not included in OpenJDK.

The OpenJDK project produces a number of components: most importantly the virtual machine ( HotSpot), the Java Class Library and the Java compiler ( javac).
