You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
chibash 7bbf0d4244 updates to note Issue #414 1 month ago
.github/workflows Using TCK Tested JDK builds of OpenJDK 8 months ago
sample updated the copyright notices to be the triple license of MPL/LGPL/AL 7 years ago
src prepares for 3.29.0-GA release 1 month ago
tutorial fixes JASSIST-255 Primitive array return values cause invalid cast to Object 6 years ago
.gitignore changes CtClass#toClass() and ClassPool#toClass() etc. to support Java 11, 3 years ago updates to note Issue #414 1 month ago fixes typos in *.md 1 month ago
License.html removes Readme.html and adds and 1 month ago removes Readme.html and adds and 1 month ago
build.xml prepares for 3.29.0-GA release 1 month ago
javassist.jar prepares for 3.29.0-GA release 1 month ago
pom.xml prepares for 3.29.0-GA release 1 month ago

Java CI with Maven

Java bytecode engineering toolkit

Javassist version 3

Copyright © 1999-2022 by Shigeru Chiba, All rights reserved.

Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. 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 when the JVM loads it. Unlike other similar bytecode editors, Javassist provides two levels of API: source level and bytecode level. If the users use the source- level API, they can edit a class file without knowledge of the specifications of the Java bytecode. The whole API is designed with only the vocabulary of the Java language. You can even specify inserted bytecode in the form of source text; Javassist compiles it on the fly. On the other hand, the bytecode-level API allows the users to directly edit a class file as other editors.

This software is distributed under the Mozilla Public License Version 1.1, the GNU Lesser General Public License Version 2.1 or later, or the Apache License Version 2.0.



To print the version number, type this command:

java -jar javassist.jar


The development of this software is sponsored in part by the PRESTO and CREST programs of Japan Science and Technology Corporation.

I’d like to thank Michiaki Tatsubori, Johan Cloetens, Philip Tomlinson, Alex Villazon, Pascal Rapicault, Dan HE, Eric Tanter, Michael Haupt, Toshiyuki Sasaki, Renaud Pawlak, Luc Bourlier, Eric Bui, Lewis Stiller, Susumu Yamazaki, Rodrigo Teruo Tomita, Marc Segura-Devillechaise, Jan Baudisch, Julien Blass, Yoshiki Sato, Fabian Crabus, Bo Norregaard Jorgensen, Bob Lee, Bill Burke, Remy Sanlaville, Muga Nishizawa, Alexey Loubyansky, Saori Oki, Andreas Salathe, Dante Torres estrada, S. Pam, Nuno Santos, Denis Taye, Colin Sampaleanu, Robert Bialek, Asato Shimotaki, Howard Lewis Ship, Richard Jones, Marjan Sterjev, Bruce McDonald, Mark Brennan, Vlad Skarzhevskyy, Brett Randall, Tsuyoshi Murakami, Nathan Meyers, Yoshiyuki Usui Yutaka Sunaga, Arjan van der Meer, Bruce Eckel, Guillaume Pothier, Kumar Matcha, Andreas Salathe, Renat Zubairov, Armin Haaf, Emmanuel Bernard, Jason T. Greene and all other contributors for their contributions.

by Shigeru Chiba