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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.
OpenJDK Other Interpretation AOT JIT; GCJ: No longer maintained or distributed by GNU as of GCC 7 [16]?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
However, since the release of OpenJDK, a specific license allows running the JCK in the OpenJDK context, that is for any GPL implementation deriving substantially from OpenJDK. [ 4 ] [ 5 ] The OpenJDK Community TCK License Agreement v 2.0 has been published for the Java SE 7 Specification since December 2011.
OpenJDK 1.8.0_212 Introduced libgraal, a shared library produced by GraalVM Native Image, which contained a pre-compiled binary of the Graal compiler that dramatically improved compilation speed. The release also improved profile-guided optimization (PGO) implementation for Native Image. GraalVM 19.2.0 2019-08-20 OpenJDK 1.8.0_222
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).
The same version of the JVM can be used in OpenJDK 8 and later releases, which means that many features and improvements can be exploited by applications that run on different versions of Java. Compared to Oracle 's HotSpot VM, OpenJ9 touts higher start-up performance and lower memory consumption at a similar overall throughput.
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.
In September 2013, Azul Systems released Zulu, a free, open source build of OpenJDK for Windows Server and the Microsoft Azure Cloud. Later releases added support for Mac OS X , multiple versions of Linux and the Java Platform, Standard Edition version 8.