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OpenJDK builds from Red Hat; Microsoft Build of OpenJDK; SapMachine, the OpenJDK build of SAP; Reinhold, Mark. "Java in 2018: Change is the Only Constant Keynote". YouTube. Benson, Gary (May 21, 2009). "Zero and Shark: a Zero-Assembly Port of OpenJDK". java.net. Archived from the original on May 31, 2009
IcedTea is a build and integration project for OpenJDK launched by Red Hat in June 2007. [3] IcedTea also includes some addon libraries: IcedTea-Web is a free software implementation of Java Web Start and the Java web browser applet plugin.
In order to be able to do this before the whole class library is made free, and to be able to bundle OpenJDK in 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. [23] [24]
The initial release in October 2021 [8] supported Java LTS 8, 11, 17, and 21. The name for the project, Temurin, is an anagram of the word runtime . [ 9 ] Since 2023 the Adoptium Working Group members Azul Systems , IBM , Open Elements and Red Hat offer commercial support for Temurin.
There is no necessary connection between the Java programming language and Java bytecode. A program written in Java can be compiled directly into the machine language of a real computer and programs written in other languages than Java can be compiled into Java bytecode. Java bytecode is intended to be platform-independent and secure. [17]
The Java Development Kit (JDK) is a distribution of Java technology by Oracle Corporation.It implements the Java Language Specification (JLS) and the Java Virtual Machine Specification (JVMS) and provides the Standard Edition (SE) of the Java Application Programming Interface (API).
OpenJDK Other Interpretation AOT JIT; GCJ: No longer maintained or distributed by GNU as of GCC 7 [16]? Yes No Yes Yes No HotSpot, OpenJDK edition Reference implementation. 1.8 No Yes Yes No Yes HotSpot, Oracle JDK edition Reference implementation. 1.8 No Yes Yes No Yes HotSpot, Java SE embedded edition ? No Yes Yes No Yes HotSpot, Zero port
Therefore, the answer to your final question is yes, Oracle is maintaining OpenJDK (along with Red Hat and Canonical and Apple and IBM and SAP and various others) in a public codebase, but simultaneously they maintain a private branch, which has copies of all the stuff in OpenJDK, but some additional tweaks (the secret sauce).