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ByteCode Libraries

BCEL

The Byte Code Engineering Library is intended to give users a convenient possibility to analyze, create, and manipulate (binary) Java class files (those ending with .class).

Category	ByteCode
License	Apache Software License
HomePage	http://jakarta.apache.org/bcel/

Javassist

Javassist (Java programming assistant) is a load-time reflective system for Java. It is a class library for editing bytecodes in Java; it enables Java programs to define a new class at runtime and to modify a class file before the JVM loads it.

Category	ByteCode
License	GNU Library or Lesser General Public License (LGPL)
HomePage	http://labs.jboss.com/javassist/

JClassLib

jclasslib bytecode is a viewer but it also contains a library that enables developers to read, modify and write Java class files and bytecode.

Category	ByteCode
License	GNU General Public License (GPL)
HomePage	http://www.ej-technologies.com/products/jclasslib/overview.html

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