Mika VM is an

open-source Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized sof ...

implementation of the

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 describ ...

specification, together with class libraries which implement the Connected Device Configuration of

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 ...

. Mika VM is based on

Wonka VM The Wonka VM is an open-source, portable, embedded implementation of the Java virtual machine specification, together with class libraries which implement most of the Connected Device Configuration of Java ME, version 1.0. The VM itself was dev ...

, which was developed independently of any other implementation, including Sun Microsystem's RI. The same is true of most of the class libraries, but in this case some code is drawn from the GNU Classpath and

Apache Harmony Apache Harmony is a retired Open-source software, open source, free Java implementations, 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 ...

projects. MikaVM support MIDP (Mobile Information Device Profile) 1.0 and 2.0, CDC (Connected Device Configuration) Personal Profile. Mika VM was created by one of the original

developers after Acunia's demise and the acquisition of its assets by Punch International. The original intention was to create a smaller VM (a mini- or micro-Wonka, hence the name) which would be useful for example on

ARM7TDMI ARM7 is a group of 32-bit RISC ARM processor cores licensed by ARM Holdings for microcontroller use. The ARM7 core family consists of ARM700, ARM710, ARM7DI, ARM710a, ARM720T, ARM740T, ARM710T, ARM7TDMI, ARM7TDMI-S, ARM7EJ-S. The ARM7TDM ...

devices with no MMU. In time however Mika became a full replacement for Wonka, and may be considered as its successor. Mika is based on the Wonka codebase, and is also open source under the

BSD license BSD licenses are a family of permissive free software licenses, imposing minimal restrictions on the use and distribution of covered software. This is in contrast to copyleft licenses, which have share-alike requirements. The original BSD li ...

. Like Wonka, Mika is intended for use in embedded devices. The VM and class libraries are therefore purposely limited to the packages required by the OSGi Execution Environment, and features introduced in Java5 or later are not supported. This results in a smaller footprint, with non-AWT versions requiring less than 2 MB of persistent storage. Supported operating systems are

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, which i ...

and uClinux (a proof-of-concept port to eCos has also been made), and supported architectures include x86, arm, mips, and powerpc, including non-MMU variants where applicable. In principle it should be possible to build Mika for any 32-bit CPU for which a GNU toolchain is available.

References

{{Java Virtual Machine Java virtual machine Software using the BSD license

See also

References