I know that exist many Java compilers, not only ''javac'' from SUN :-)

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Question: I know that exist many Java compilers, not only "javac" from SUN
Could you list some of them and describe advantages of them over SUN's version?

Answer: Part I

I list some of them here with short descriptions... Most of them are extending Java with additional features, keywords, functions and so on..

1. Java espresso is a Java 1.0 compliant compiler being developed at Boston University:
http://types.bu.edu/Espresso/JavaEspresso.html

The objectives of this implementation were to understand the issues involved in the development of a modern object-oriented compiler for a real language, to study the Java Virtual Machine (JVM) and its runtime system

2. The GNU Compiler for the Java: http://gcc.gnu.org/java/
GCJ is a portable, optimizing, ahead-of-time compiler for the Java Programming Language. It can compile:
Java source code directly to native machine code, Java source code to Java bytecode (class files), and Java bytecode to native machine code.

3. The Jikes compiler:
http://oss.software.ibm.com/developerworks/opensource/jikes/
Jikes has four advantages that make it a valuable contribution to the Java community:

Open source. Jikes is OSI Certified Open Source Software. OSI
Certified is a certification mark of the Open Source
Initiative.

• Strictly Java compatible. Jikes strives to adhere to both the
  Java Language Specification and the Java Virtual Machine
  Specification as tightly as possible, and does not support
  subsets, supersets, or other variations of the language. The
  FAQ describes some of the side effects of this strict language
  conformance.
• High performance. Jikes is a high performance compiler, making
  it ideal for use with larger projects.
• Dependency analysis. Jikes performs a dependency analysis on
  your code that provides two very useful features:
  Incremental builds and makefile generation.
  
  --> to be continued in our next tip -->

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