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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. Like most other Free Java virtual machines, Kaffe uses GNU Classpath as its class library.
| Original author(s) |
|
|---|---|
| Developer(s) | Transvirtual Technologies |
| Initial release | 1996 |
| Final release | 1.1.9[1] 
/ 22 February 2008 |
| Preview release | 1.1.10-pre[2]
/ 22 August 2011 |
| Repository | |
| Written in | C and Java |
| Operating system | Unix-like |
| Type | Java Virtual Machine |
| License | GPL-2.0-only |
| Website | www |
Kaffe, first released in 1996, was the original open-source Java implementation. Initially developed as part of another project, it grew so popular that developers Tim Wilkinson and Peter Mehlitz founded Transvirtual Technologies, Inc. with Kaffe as the company's flagship product. In July 1998, Transvirtual released Kaffe OpenVM under a GNU General Public License.
Kaffe is a lean and portable virtual machine, although it is significantly slower than commercial implementations.[3] When compared to the reference implementation of the Java Virtual Machine written by Sun Microsystems, Kaffe was significantly smaller; it thus appeals to embedded system developers.[unbalanced opinion?] It comes with just-in-time compilers for many of the CPU architectures, and has been ported to more than 70 system platforms in total. It runs on devices ranging from embedded SuperH devices to IBM zSeries mainframe computers, and it will even run on a PlayStation 2.
Unlike other implementations, in the past Kaffe used GNU Multi-Precision Library (GMP) to support arbitrary precision arithmetic. This feature has been removed from release 1.1.9, causing protests from people that claim they used Kaffe for the sole reason of GMP arithmetic being faster than the typical pure java implementation, available in other distributions.[4][unreliable source?] The capability was removed to reduce the maintenance work, expecting that interested people will integrate GMP support into GNU Classpath or OpenJDK. Subsequently, GNU Classpath introduced GMP support in version 0.98.
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