Squawk virtual machine

Squawk virtual machine

Infobox Software
name = Squawk



caption = The pink area is written in C/C++ while the blue area is written in java
developer = Sun Microsystems
latest release version =
latest release date =
latest preview version =
latest preview date =
operating system = Cross-platform
programming language = C and Java
genre = Java Virtual Machine
license = GNU General Public License
website = https://squawk.dev.java.net/

Squawk is a Java virtual machine (JVM) for embedded system and small devices. Most virtual machines for the Java platform, if not all, 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. A Java implementation provides ease of portability, and a seamless 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 developmentThe research project was inspired by Squeak, which has a Java Micro Edition heritage and features a small memory footprint. [A Java Virtual Machine Architecture for Very Small Devices [http://www.grundu.net/papers/squawk.pdf] ] 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.

References

See also

*Sun SPOT
*Rubinius
*JikesRVM
*List of Java virtual machines

External links

* [https://squawk.dev.java.net/ Squawk main website]
* [http://research.sun.com/projects/squawk/squawk-rjvm.html Squawk Project]
* [http://today.java.net/pub/a/today/2007/08/31/j1-2k7-mtH11.html SunSPOTs and Squawk technology Podcast]
* [http://research.sun.com/projects/squawk/docs/lctes03.pdf A Java Virtual Machine Architecture for Very Small Devices]
* [http://research.sun.com/projects/squawk/docs/oopsla05-squawk.pdf The Squawk Virtual Machine: Java(TM) on the Bare Metal]
* [http://developers.sun.com/learning/javaoneonline/2006/coolstuff/TS-1598.html Javaone 2006 Squawk for Wireless Sensor Networks]
* [http://www.inspiredproject.com/documents/Grimaud_Java_Virtual_Machine.pdf Application-Driven Customization of an Embedded Java Virtual Machine]
* [http://www.sunspotworld.com/ Project Sun Spot]
* [http://research.sun.com/projects/squawk/docs/oopsla05-squawk-poster.pdf Squawk Poster]
* [http://www.youtube.com/watch?v=qbLlwz-HhpA Youtube video about Squawk]


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