This article provides non-exhaustive lists of

Java SE Java Platform, Standard Edition (Java SE) is a computing platform for development and deployment of portable code for desktop and server environments. Java SE was formerly known as Java 2 Platform, Standard Edition (J2SE). The platform uses Ja ...

Java virtual machine A Java virtual machine (JVM) is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. The JVM is detailed by a specification that formally describe ...

s (JVMs). It does not include every

Java ME Java Platform, Micro Edition or Java ME is a computing platform for development and deployment of portable code for embedded and mobile devices (micro-controllers, sensors, gateways, mobile phones, personal digital assistants, TV set-top ...

vendor. Note that

Java EE Jakarta EE, formerly Java Platform, Enterprise Edition (Java EE) and Java 2 Platform, Enterprise Edition (J2EE), is a set of specifications, extending Java SE with specifications for enterprise features such as distributed computing and web ser ...

runs on the standard Java SE JVM but that some vendors specialize in providing a modified JVM optimized for Java EE applications. Much Java development work takes place on

Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for se ...

, Solaris,

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, whi ...

, and

FreeBSD FreeBSD is a free and open-source Unix-like operating system descended from the Berkeley Software Distribution (BSD), which was based on Research Unix. The first version of FreeBSD was released in 1993. In 2005, FreeBSD was the most popular ...

, primarily with the

Oracle An oracle is a person or agency considered to provide wise and insightful counsel or prophetic predictions, most notably including precognition of the future, inspired by deities. As such, it is a form of divination. Description The word ...

JVMs. Note the further complication of different

32-bit In computer architecture, 32-bit computing refers to computer systems with a processor, memory, and other major system components that operate on data in 32- bit units. Compared to smaller bit widths, 32-bit computers can perform large calculati ...

64-bit In computer architecture, 64-bit integers, memory addresses, or other data units are those that are 64 bits wide. Also, 64-bit CPUs and ALUs are those that are based on processor registers, address buses, or data buses of that size. A ...

varieties. The primary reference Java VM implementation is HotSpot, produced by

Oracle Corporation Oracle Corporation is an American multinational computer technology corporation headquartered in Austin, Texas. In 2020, Oracle was the third-largest software company in the world by revenue and market capitalization. The company sells da ...

and many other big and medium-sized companies (e.g. IBM, Redhat,

Microsoft Microsoft Corporation is an American multinational technology corporation producing computer software, consumer electronics, personal computers, and related services headquartered at the Microsoft Redmond campus located in Redmond, Washi ...

Azul Azul, meaning "blue" in Spanish and Portuguese, may refer to: Arts and entertainment * ''Azul'' (Los Piojos album), 1998 * ''Azul'' (Cristian Castro album), 2001 * Azul Azul, a Bolivian pop-dance music group ** "Azul" (song), the title song * " ...

, SAP).

Free and open source implementations

Active

Codename One Codename One is an open-source cross-platform framework aiming to provide write once, run anywhere code for various mobile and desktop operating systems (like Android, iOS, Windows, MacOS, and others). It was created by the co-founders of LWUI ...

– 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 GraalVM is a Java VM and JDK based on HotSpot/ OpenJDK, implemented in Java. It supports additional programming languages and execution modes, like ahead-of-time compilation of Java applications for fast startup and low memory footprint. The f ...

– 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 is an open-source Java compiler written in C++. It is no longer being updated. The original version was developed by David L. "Dave" Shields and Philippe Charles at IBM but was quickly transformed into an open-source project contributed ...

(Jikes Research Virtual Machine) – research project. PPC and

IA-32 IA-32 (short for "Intel Architecture, 32-bit", commonly called i386) is the 32-bit version of the x86 instruction set architecture, designed by Intel and first implemented in the 80386 microprocessor in 1985. IA-32 is the first incarnatio ...

. Supports Apache Harmony and GNU Classpath libraries.

Eclipse Public License The Eclipse Public License (EPL) is a free and open source software license most notably used for the Eclipse IDE and other projects by the Eclipse Foundation. It replaces the Common Public License (CPL) and removes certain terms relating to li ...

. *

leJOS "Lejos" (English: "Far") is a song by Puerto Rican-American singer-songwriter Toby Love. It was released on August 21, 2012 by Top Stop Music for his fourth studio album, '' Amor Total''. The song's music video, which was directed by Danny Hastin ...

– Robotics suite, a firmware replacement for

Lego Mindstorms Lego Mindstorms is a hardware and software structure which develops programmable robots based on Lego building blocks. Each version includes computer Lego bricks, a set of modular sensors and motors, and Lego parts from the Technic line to ...

programmable bricks, provides a Java programming environment for the Lego Mindstorms RCX and NXT robots. * Maxine – meta-circular open source research VM from Oracle Labs and the University of Manchester.

Inactive

Apache Harmony Apache Harmony is a retired open source, free Java implementation, developed by the Apache Software Foundation. It was announced in early May 2005 and on October 25, 2006, the Board of Directors voted to make Apache Harmony a top-level project ...

– supports several architectures and systems. Discontinued November 2011. Apache License 2.0. * GCJ the GCC Java compiler, that compiles either to bytecode or to native machine code. As of GCC 7, gcj and associated libjava runtime library have been removed from GCC. *

IKVM.NET IKVM.NET is an implementation of Java for Mono and the Microsoft .NET Framework. IKVM is free software, distributed under the zlib permissive free software license. The original developer, Jeroen Frijters, discontinued work on IKVM in 2015. ...

– Java for

Mono Mono may refer to: Common meanings * Infectious mononucleosis, "the kissing disease" * Monaural, monophonic sound reproduction, often shortened to mono * Mono-, a numerical prefix representing anything single Music Performers * Mono (Japanes ...

and the Microsoft .NET Framework. Uses

OpenJDK OpenJDK (Open Java Development Kit) is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). It is the result of an effort Sun Microsystems began in 2006. The implementation is licensed under the GPL-2.0-only w ...

. Zlib License. * JamVM – developed to be an extremely small virtual machine. Uses GNU Classpath and

. Supports several architectures. GPL. Last update 2014. * JOP – hardware implementation of the JVM. GPL 3. *

Juice Juice is a drink made from the extraction or pressing of the natural liquid contained in fruit and vegetables. It can also refer to liquids that are flavored with concentrate or other biological food sources, such as meat or seafood, such as ...

– JavaME experimental

JVM A Java virtual machine (JVM) is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. The JVM is detailed by a specification that formally describes ...

developed to run on the NUXI operating system. *

Jupiter Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, but slightly less than one-thousand ...

– uses Boehm garbage collector and GNU Classpath. GPL. Unmaintained. *

Kaffe Kaffe is a discontinued "clean room design" ( reverse engineering) version of a Java Virtual Machine. It comes with a subset of the Java Platform, Standard Edition (Java SE), Java API, and tools needed to provide a Java runtime environment. L ...

– uses GNU Classpath. GPL. 1.1.9 released on February 26, 2008. * Mika VM – intended for use in embedded devices. Cross-platform. BSD-style licence. * NanoVM – developed to run on the

Atmel AVR AVR is a family of microcontrollers developed since 1996 by Atmel, acquired by Microchip Technology in 2016. These are modified Harvard architecture 8-bit RISC single-chip microcontrollers. AVR was one of the first microcontroller families ...

ATmega8 used in the Asuro Robot, can be ported to other AVR-based systems. * SableVM – first free software JVM to support JVMDI and JDWP. Makes use of GNU Classpath. LGPL. Version 1.13 released on March 30, 2007. * Squawk virtual machine – a

VM for embedded systems and small devices. Cross-Platform. GPL. *

SuperWaba SuperWaba is a discontinued Java-like virtual machine (VM) that targets portable devices. Software developers use application programming interfaces (APIs), accessed through associated libraries (packaged as Jars) and small tools (together composi ...

– Java-like virtual machine for portable devices. GPL. Discontinued, succeeded by TotalCross. * TakaTuka – for wireless sensor network devices. GPL. * TinyVM. * VMKit of

LLVM LLVM is a set of compiler and toolchain technologies that can be used to develop a front end for any programming language and a back end for any instruction set architecture. LLVM is designed around a language-independent intermediate repre ...

. * Wonka VM – developed to run on Acunia's ARM-based hardware. Some code drawn from GNU Classpath. BSD-style licence. No longer under active development, superseded by Mika VM.

Java operating systems

Some JVM's are intended to run without an underlying OS. * JX – Java operating system that focuses on a flexible and robust operating system architecture developed as an open source system by the University of Erlangen. GPL. Version 0.1.1 released on October 10, 2007 * JavaOS – Original project from Sun Microsystems

Proprietary implementations

Active

* Azul Platform Prime – a fully compliant, high-performance Java virtual machine based on OpenJDK that uses

Azul Systems Azul Systems, Inc. develops runtimes ( JDKs, JVMs) for executing Java-based applications. Founded in March 2002, Azul Systems is headquartered in Sunnyvale, California Products Azul Platform Prime (Formerly Zing) Azul produces ''Platform ...

's C4 garbage collector and Falcon JIT compiler. * JamaicaVM ( aicas) – a hard real-time Java VM for embedded systems.

Inactive

Excelsior JET Excelsior JET is a now-defunct proprietary Java SE technology implementation built around an ahead-of-time (AOT) Java to native code compiler. The compiler transforms the portable Java bytecode into optimized executables for the desired hardware a ...

– a licensed Java SE implementation with

AOT compiler In computer science, ahead-of-time compilation (AOT compilation) is the act of compiling an (often) higher-level programming language into an (often) lower-level language before execution of a program, usually at build-time, to reduce the amount ...

for Windows, OS X, and Linux on

Intel x86 x86 (also known as 80x86 or the 8086 family) is a family of complex instruction set computer (CISC) instruction set architectures initially developed by Intel based on the Intel 8086 microprocessor and its 8088 variant. The 8086 was intr ...

and Linux on 32-bit ARM. * Jinitiator – developed by Oracle before they purchased Sun. Designed to improve support for

Oracle Forms Oracle Forms is a software product for creating screens that interact with an Oracle database. It has an IDE that includes an object navigator, property sheet, and code editor that uses PL/SQL. It was originally developed to run server-side i ...

in web sites. * JRockit (originally from

Appeal Virtual Machines Appeal Virtual Machines was a Swedish company created in 1998 by students from the Royal Institute of Technology in Stockholm. They were mainly known for their JRockit Java Virtual Machine. They were acquired in 2002 by BEA Systems, who became pa ...

) – acquired by Oracle for Linux, Windows and Solaris. * Mac OS Runtime for Java (MRJ). * Microsoft Java Virtual Machine – discontinued in 2001.

Lesser-known proprietary Java virtual machines

* Blackdown Java was a licensed port to Linux of the reference SunSoft implementation. It was discontinued in 2007, after

became available. * Sun CVM – CVM originally standing for "Compact Java Virtual Machine". *

Gemstone A gemstone (also called a fine gem, jewel, precious stone, or semiprecious stone) is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks (such as lapis lazuli, opal, ...

– modified for Java EE features (application DBMS). *

Intent Intentions are mental states in which the agent commits themselves to a course of action. Having the plan to visit the zoo tomorrow is an example of an intention. The action plan is the ''content'' of the intention while the commitment is the ''a ...

(Tao Group). * PreonVM – a Java VM for embedded systems and small and resource constrained devices.

References

External links

List of Java virtual machines (JVMs), Java development kits (JDKs), Java runtime environments (JREs)
{{Java Virtual Machine Java platform software

Java virtual machines

Free and open source implementations

Active

Inactive

Java operating systems

Proprietary implementations

Active

Inactive

Lesser-known proprietary Java virtual machines

See also

References

External links