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JC Virtual machine converts Java class files to C source code. It uses SOOT Java Bytecode analysis framework to convert the Java files to C. It could also compiles with GCC and loads them with built-in ELF loader. Additional to that, JC provides a complete Java runtime with optimization to increase performance.
JC optimizes the code at code generation time which increases its runtime performance. It does have good interpreter but most of the jobs are done at the code generation time. When combined with the proven power of GCC's C optimizer the results are impressive.
Additional to C conversion and Java runtime, It has thread support based on the POSIX pthread(3). Support for JNI, Reflection and Java 2 style loader support is also available. It uses GNU Classpath to provide java runtime.
GNU Classpath provides core class libraries for use with virtual machines and compilers for the java programming language. GNU Classpath 1.0 will be fully compatible with the 1.1 and 1.2 API specifications, in addition to having significant compatibility with the 1.3, 1.4, 1.5 and 1.6 APIs.
Java Standard Edition provides Java development kit and Runtime to develop and deploy Java programs. Developed by Sun and take over by Oracle. It has support for different environments like Desktop, Embedded, Web, Realtime etc.
Apache Harmony is a modular Java runtime with class libraries and associated tools. One of the goals of the Harmony project is to create a design modular enough so that parts of the VM can be implemented in different languages. This project started in 2005 and it is under active development.
The Xen hypervisor is a layer of software running directly on computer hardware replacing the operating system thereby allowing the computer hardware to run multiple guest operating systems concurrently. It suppors x86, x86-64, Itanium, Power PC, and ARM processors allow the Xen hypervisor to run on a wide variety of computing devices.
Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.
The FOSS-Cloud is a Software, which enables you, to build your own Private or your Public-Cloud.
The FOSS-Cloud environment (software and hardware) is an integrated and redundant server infrastructure to provide cloud-Services, Windows or Linux based SaaS, Terminal Server, Virtual Desktop Infrastructure (VDI) or virtual server-environmens. It makes virtual machines available, which can be accessed from internally as well as from the Internet.