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OpenJDK (Open Java Development Kit) is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). [2] It is the result of an effort Sun Microsystems began in 2006, four years before the company was acquired by Oracle Corporation.
Sun released most of its Java source code as free software in May 2007, so it can now almost be considered a free Java implementation. [1] Java implementations include compilers, runtimes, class libraries, etc. Advocates of free and open source software refer to free or open source Java virtual machine software as free runtimes or free Java ...
Codename One – uses the open source ParparVM; Eclipse OpenJ9 – open-source from IBM J9, for AIX, Linux (x86, Power, and Z), macOS, Windows, MVS, OS/400, Pocket PC, z/OS. GraalVM – is based on HotSpot/OpenJDK, it has a polyglot feature, to transparently mix and match supported languages. HotSpot – the open-source Java VM implementation ...
The Eclipse Adoptium (/ ə ˈ d ɒ p t i ə m /) Working Group is the successor of AdoptOpenJDK. [2] [3]The main goal of Adoptium is to promote and support free and open-source high-quality runtimes and associated technology for use across the Java ecosystem. [4]
javac – the Java compiler, which converts source code into Java bytecode; javadoc – the documentation generator, which automatically generates documentation from source code comments; jar – the archiver, which packages related class libraries into a single JAR file. This tool also helps manage JAR files.
The GraalVM compiler, Graal, was started by manually converting the code of the HotSpot client compiler (named "C1") into Java, replacing the previous Maxine compiler. [ 9 ] Graal was included in HotSpot-based JDK releases such as OpenJDK from Java SE 9 through 15, to provide experimental ahead-of-time compilation.
The JVM reference implementation is developed by the OpenJDK project as open source code and includes a JIT compiler called HotSpot. The commercially supported Java releases available from Oracle are based on the OpenJDK runtime. Eclipse OpenJ9 is another open source JVM for OpenJDK.
For example, the Java compiler, which converts Java source code into Java bytecode (an intermediate language for the JVM), is provided as part of the Java Development Kit (JDK). The Java Runtime Environment (JRE), complementing the JVM with a just-in-time (JIT) compiler , converts intermediate bytecode into native machine code on the fly.