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Concept
OpenJDK
Summary
OpenJDK (Open Java Development Kit) is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). It is the result of an effort Sun Microsystems began in 2006. The implementation is licensed under the GPL-2.0-only with a linking exception. Were it not for the GPL linking exception, components that linked to the Java Class Library would be subject to the terms of the GPL license. OpenJDK is the official reference implementation of Java SE since version 7.
The OpenJDK project produces a number of components: most importantly the virtual machine (HotSpot), the Java Class Library and the Java compiler (javac).
The web-browser plugin and Web Start, which form part of Oracle Java, are not included in OpenJDK. 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 are those provided by IcedTea.
OpenJDK 9+ supports AOT compilation () using GraalVM (JEP 295). The experimental flag enables the use of Graal JIT (JEP 317).
OpenJDK was initially based only on the JDK 7 version of the Java platform.
Since JDK 10, the effort to produce an open-source reference implementation of the Java SE Platform was moved over to the JDK Project. Unlike past JDK Release Projects, which produced just one feature release and then terminated, this long-running project will produce all future JDK feature releases and will ship a feature release every six months according to a strict, time-based model.
Due to Oracle no longer releasing updates for long-term support (LTS) releases under a permissive license, others have begun offering builds. Linux distributions have always offered their own builds, and Windows also offers one now;
winget install ojdkbuild.openjdk.17.jre
IcedTea
In order to bundle OpenJDK in Fedora and other free Linux distributions, OpenJDK needed to be buildable using only free software components.
Official source
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