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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 .
Free GPL version 2 or later, with the "libgcc exception" [3] GraalVM: Oracle: May 2019 GraalVM for JDK 22.0.1 [4] 16 April 2024; 8 months ago () Free GPL version 2 only HotSpot, OpenJDK edition Sun Microsystems, Oracle: 27 April 1999 jdk-16 16 March 2021 Free GPL version 2 only HotSpot, Oracle JDK edition Sun Microsystems, Oracle: 27 April 1999
Oracle provides tests that verify the proper operation of implementations of the Java Virtual Machine. One of Oracle's JVMs is named HotSpot; the other, inherited from BEA Systems , is JRockit . Oracle owns the Java trademark and may allow its use to certify implementation suites as fully compatible with Oracle's specification.
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 by Oracle. Jikes RVM (Jikes Research Virtual Machine) – research project. PPC and IA-32. Supports Apache Harmony and GNU Classpath libraries. Eclipse Public License.
Oracle JDK 20.0.1 OpenJDK 20.0.1 GraalVM for JDK 21 2023-09-19 Oracle JDK 21 OpenJDK 21 This release brought all Java SE 21 features to GraalVM such as virtual threads from Project Loom. Performance improvements in this release made ahead-of-time compiled Java applications run at peak performance as on HotSpot.
It is derivative of the community driven OpenJDK which Oracle stewards. [5] It provides software for working with Java applications. Examples of included software are the Java virtual machine, a compiler, performance monitoring tools, a debugger, and other utilities that Oracle considers useful for Java programmers.
It is an extensive test suite used by Oracle and licensees to ensure compatible implementations of the platform. The JCK for Java 6.0 source code has been released. [ 1 ] [ 2 ] The associated license did not initially allow users to compile or run the tests, [ 3 ] but the right to see the code is not associated with tainting concerns, and ...
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] To do so the Adoptium Working Group (WG) builds and provides OpenJDK based binaries under the Eclipse Temurin project. [ 5 ]