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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.
GPL version 2 or later JamVM: Robert Lougher 13 March 2003 2.0.0 30 July 2014 Free GPL version 2 or later Jato VM: Pekka Enberg and contributors [9]? 0.3 [10] 4 January 2012 [10] Free GPL version 2 only [9] JC virtual machine: Archie L. Cobbs ? 1.4.7 13 November 2005 Free LGPL version 2.1 or later Jikes RVM: IBM: 14 October 2001 3.1.4 [11] 18 ...
Oracle releases binaries for the x86-64 architecture for Windows, macOS, and Linux based operating systems, and for the aarch64 architecture for macOS and Linux. Previous versions supported the Oracle Solaris operating system and SPARC architecture. Oracle's primary implementation of the JVMS is known as the HotSpot (virtual machine).
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.
However, newer JVM releases, such as the OpenJDK HotSpot JVM, support 64-bit architecture. Consequently, you can install a 32-bit or 64-bit JVM on a 64-bit operating system. The primary advantage of running Java in a 64-bit environment is the larger address space.
Much Java development work takes place on Windows, Solaris, Linux, and FreeBSD, primarily with the Oracle JVMs. Note the further complication of different 32-bit / 64-bit varieties. The primary reference Java VM implementation is HotSpot , produced by Oracle Corporation and many other big and medium-sized companies (e.g. IBM , Redhat ...
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.
The platform was known as Java 2 Platform, Standard Edition or J2SE from version 1.2, until the name was changed to Java Platform, Standard Edition or Java SE in version 1.5. The "SE" is used to distinguish the base platform from the Enterprise Edition and Micro Edition platforms. The "2" was originally intended to emphasize the major changes ...