The Java Runtime Environment (JRE) is a component of the JDK that is required to run Java. What is the Java Runtime Environment (JRE) JDKs include the Java Runtime Environment (JRE), as well as other tools that help you develop Java. Some of them are built from the OpenJDK code on GitHub. Java Development Kits (JDKs) are implementations of the Java SE platform specification by different vendors and groups of people, such as the open source community. The Java Community Process (JCP) is a process to facilitate the review and ultimate inclusion of changes to the Java specifications. JSRs are considered for inclusion in the Java specifications by the Java Community Process (JCP). ![]() ![]() A JSR may also be a suggested new specification for Java SE that does not require a JEP, such as a new specification for an API for computer vision. Not all JEPs will have JSRs if the JEP doesn't have changes to the specifications, you don't need a JSR. What is a JSR?Ī Java Specification Request (JSR) may detail potential specification changes (where present) that arise from one or more JEPs. In this instance, a corresponding Java Specification Request (JSR) is required. Some JEPs require changes to the Java specifications. ![]() Like all good roadmaps, there's no commitment to inclusion or timescales. You can think of them as the roadmap for Java. JDK Enhancement Proposal (JEP) is a proposed change to OpenJDK. Contributors need to have signed the Oracle Contributor Agreement. To contribute to OpenJDK, you need to use a JDK Enhancement Proposal (JEP) to start with.Ĭorrection with thanks to Marc Maathuis: You don't always need a JEP to contribute to the OracleJDK. This blog from Oracle has a graphic which breaks down committers for Java 15 - those that committed code to OpenJDK. There are various channels to contribute to OpenJDK. This is the reference implementation of the Java specifications that we mentioned above. Lastly, OpenJDK can also refer to just the source code repository on GitHub that we spoke about earlier, available at. Oracle provides fixes to this JDK for 6 months (until the next release of Java). For example AdoptOpenJDK, which is available at. Many other vendors use the term OpenJDK for their specific JDK binary, which is produced by building a binary off the OpenJDK code on GitHub. These are version specific binaries built from the source code which is available on GitHub at of OpenJDK. OpenJDK can also refer to Oracle's free official reference implementation of the Java specifications which live at. This is the use that I will refer to througout this blog. OpenJDK serves as a continuation of that change. ![]() Sun Microsystems open-sourced the majority of Java in 2006 under the GNU General Public License (GNU GPL) version 2 with a linking exception. The phrase OpenJDK is used to describe at least three fundamental things in the Java ecosystem.įirstly, there is a place called OpenJDK which lives at also known to some as The OpenJDK Project, which is a place to collaborate on an open-source implementation of the Java specifications from Oracle -, which are released every 6 months. This post attempts to explain them all in terms of two main groupings: Sometimes those acronyms even mean multiple things. The Java SE landscape is strewn with acronyms that it has picked up over the last 25 years. She has over 20 years’ experience in the software industry which has been gained in a variety of roles including developer, technical. Helen is a Java Developer Advocate at JetBrains.
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