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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 .
Java SE defines a range of general-purpose APIs—such as Java APIs for the Java Class Library—and also includes the Java Language Specification and the Java Virtual Machine Specification. [20] OpenJDK is the official reference implementation since version 7.
Blackdown Java was a licensed port to Linux of the reference SunSoft implementation. It was discontinued in 2007, after OpenJDK became available. Sun CVM – CVM originally standing for "Compact Java Virtual Machine". Gemstone – modified for Java EE features (application DBMS). Intent (Tao Group).
Platform Prime is compliant with the associated Java SE version standards. It is based on the same HotSpot JVM and JDK code base used by the Oracle and OpenJDK JDKs, with enhancements relating to garbage collection, JIT compilation, and Warmup behaviors, all aimed at producing improved application execution metrics and performance indicators.
Latest supported Java version Supported class libraries Performance GNU Classpath OpenJDK Other Interpretation AOT JIT; GCJ: No longer maintained or distributed by GNU as of GCC 7 [16]?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 ...
The Eclipse Temurin project produces Temurin (/ ˈ t ɛ m j ər ɪ n /), a certified binary build of OpenJDK. 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]
Free Java implementations are software projects that implement Oracle's Java technologies and are distributed under free software licences, making them free software. 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 ]
Tiered compiling, an option introduced in Java 7, uses both the client and server compilers in tandem to provide faster startup time than the server compiler, but similar or better peak performance. [9] Starting in Java 8, tiered compilation is the default for the server VM. [10] HotSpot is written in C++ and Assembly.