Home > Computers > Programming > Languages > Java > Class Libraries > Data Formats > Java Class Files
http://asm.ow2.org/
Java bytecode manipulation and analysis framework. Site includes documentation, issue tracker, and download option. [BSD License]
http://barat.sourceforge.net/
Compiler front-end for Java, supports static analysis of programs, parses source code and class files, builds full abstract syntax tree from source code files, enriched with name and type analysis information. [Open Source, BSD License]
http://bcel.sourceforge.net/
Implementation of an API for reading, writing, and modifying class files in an object-oriented fashion. Can be used to create (dis)assemblers, (de)compilers, and obfuscators. [Open Source, LGPL]
http://byteml.blogspot.com/
A Java bytecode/XML intreroperability framework. Converts a .class file to a XML file. [Open source, GPL]
http://cglib.sourceforge.net/
Bytecode manipulation library used to extend Java classes and implement interfaces at runtime. [Open source, Apache Software License]
http://www.ej-technologies.com/products/jclasslib/overview.html
A Java class file library also contains the popular Java byte code viewer. [Open source, GPL]
http://www.gnu.org/software/kawa/api/gnu/bytecode/package-summary.html
Contains classes to generate, read, write, and print Java bytecode (.class) files. Part of the Kawa project. [Open Source, GPL]
http://teatrove.sourceforge.net/trove.html
Contains a Class File API to simplify the creation (and modification!) of Java class files - high-level methods are provided in order to avoid having to write bytecode directly. [Open Source, BSD-like]
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