Kaffe is a clean room implementation of the Java virtual machine, plus the associated class libraries needed to provide a Java runtime environment. It has support for Garbage Collector, Debugging, Profiler, Benchmarking etc. It has been ported to multiple platforms. Among the open source VM, Kaffe is actively developed.

  Kaffe is not an officially licensed version of the Java virtual machine. It contains no Sun source code and was developed without even looking at the Sun source code. Kaffe is a great choice as a base for virtual machine education and research.

Kaffe is a clean room implementation of the Java virtual machine, plus the associated class libraries needed to provide a Java runtime environment. 

Kaffe - Not Java

This project contains a downstream version of the OpenJDK project. It is used to build and maintain a SAP supported version of OpenJDK for SAP customers and partners who wish to use OpenJDK to run their applications.

SapMachine - An OpenJDK release maintained and supported by SAP

Kaffe is a great choice as a base for virtual machine education and/or research, or if you need a virtual machine as an integral component of an open source or free software Java distribution. Kaffe is constantly under development, and lacks compatibility in many ways with the current releases of Java. It lacks many key features of a full Java virtual machine implementation - including security related features such as a complete bytecode verifier essential for running untrusted code. <BR><BR>Kaffe is not the best Java virtual machine for developing Java applications, as it lacks much in the way of documentation, compatibility, debugging/profiling support, etc. If you are learning Java, or are looking for a complete Java development environment, you will probably be best served by using a "real" Java development environment (such as the JDK) licensed from Sun. Check out our links page for more information.

Kaffe is a clean room implementation of the Java virtual machine, plus the associated class libraries needed to provide a Java runtime environment.

Kaffe

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Kaffe - Not Java

SapMachine - An OpenJDK release maintained and supported by SAP

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Kaffe - Not Java

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