Squawk virtual machine

Squawk

Developer(s)| Sun Microsystems
Initial release| April 2002; 24 years ago (2002-04)
Repository| github.com/tomatsu/squawk
Written in| C and Java
Operating system| Cross-platform
Type| Java virtual machine
License| GNU General Public License
Visual comparison with HotSpot

Squawk is a Java micro edition virtual machine for embedded system and small devices. Most virtual machines for the Java platform are written in low level native languages such as C/C++ and assembler; what makes Squawk different is that Squawk's core is mostly written in Java (this is called a meta-circular interpreter). A Java implementation provides ease of portability, and integration of virtual machine and application resources such as objects, threads, and operating-system interfaces.

The Squawk Virtual Machine figure can be simplified as:

* Write as much of the VM in Java as possible
* Targeting small, resource constrained devices
* Enable Java for micro-embedded development

The research project was inspired by Squeak. Squawk has a Java ME heritage and features a small memory footprint.[1] It was developed to be simple with minimal external dependencies. Its simplicity made it portable and easy to debug and maintain. Squawk also provides an isolated mechanism by which an application is represented as an object. In Squawk, one or more applications can run in the single JVM. Conceptually, each application is completely isolated from all other applications.

## See also

* Sun SPOT
* Jikes RVM, another JVM written mostly in Java
* Rubinius, a VM for Ruby written in Ruby
* MicroEJ VEE, another JVM written mostly in (an extended version of) Java
* List of Java virtual machines

## References

1. ↑ A Java Virtual Machine Architecture for Very Small Devices

## External links

* SunSPOTs and Squawk technology Podcast
* A Java Virtual Machine Architecture for Very Small Devices
* The Squawk Virtual Machine: Java(TM) on the Bare Metal
* Javaone 2006 Squawk for Wireless Sensor Networks
* Application-Driven Customization of an Embedded Java Virtual Machine
* Ahead of time deployment in ROM of a Java-OS
* Project Sun Spot
* Squawk Poster

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Java virtual machines (comparison)

Sun, Oracle|

* HotSpot
* KVM
* OpenJDK
* Maxine

Major implementations|

* JamVM
* Jikes RVM
* IBM J9

Embedded|

* Excelsior JET Embedded
* JamaicaVM
* Mika VM
* Mysaifu
* Squawk (Sun)
* CEE-J

Others|

* CACAO
* IcedTea
* JX
* more…

Discontinued|

* Apache Harmony
* Dalvik
* GCJ
* IKVM.NET
* JRockit
* Kaffe
* Microsoft JVM
* SableVM
* Jupiter
* Excelsior JET
* more…

* v
* t
* e

Java

Platforms|

* Java language
* JVM
* Micro Edition
* Standard Edition
* Enterprise Edition
* Java Card
* Android SDK

Oracle technologies|

* Squawk
* Java Development Kit
* OpenJDK
* Java virtual machine
* JavaFX
* Maxine VM

Platform technologies|

* Applets
* Servlets
* MIDlets
* JSP
* JSF
* Web Start (JNLP)

Major third-party technologies|

* Blackdown
* Eclipse
* GNU Classpath
* GWT
* Harmony
* Hibernate
* IcedTea
* Jazelle
* Spring
* Struts
* TopLink
* WildFly

History|

* Java version history
* Java Community Process
* Sun Microsystems
* Free Java implementations

Major JVM languages|

* BeanShell
* Clojure
* Groovy
* JRuby
* Jython
* Kotlin
* Processing
* Rhino
* Scala

Community|

| Conferences|

* JavaOne
* Devoxx

|

Organizations|

* Apache Software Foundation
* Java Community Process
* Oracle Corporation
* Sun Microsystems, Sun Microsystems Laboratories

People|

* James Gosling
* Arthur van Hoff
* Urs Hölzle
* Patrick Naughton

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