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Tools for working with Java class files and JARs

Project description

Overview of python-javatools

A python module for unpacking and inspecting Java Class files, JARs, and collections of either. Supporting features up to JDK 8.

It can do deep checking of classes to perform comparisons of functionality, and output reports in multiple formats.

If you have suggestions, please use the issue tracker on github. Or heck, just fork it!


In addition, the following tools are used in building and testing the project.

All of these packages are available in most linux distributions (eg. Fedora), and for OSX via MacPorts and HomeBrew, or available directly from pip.

M2Crypto can be difficult on some platforms, and so is set as an optional dependency. If an execution path attempts to perform an action which requires M2Crypto (primarily Jar signing and Jar signature verification), then a CryptoDisabled exception will be raised, or a message will be printed to stdout explaining that the feature is unavailable. See the M2Crypto Install Guide for workarounds in your environment.


This module uses setuptools, so running the following will build the project:

python build

to install, run:

python -m pip install . --user


Tests are written as unittest test cases. If you'd like to run the tests, simply invoke:

python test

or invoke tests across a wider range of platforms via tox


If you'd prefer to build an RPM, see the wiki entry for Building as an RPM.

Javatools Scripts

  • classinfo - similar to the javap utility included with most JVMs. Also does provides/requires tracking.

  • classdiff - attempts to find differences between two Java class files

  • jarinfo - prints information about a JAR. Also does provides/requires tracking.

  • jardiff - prints the deltas between the contents of a JAR, and runs classdiff on differing Java class files contained in the JARs

  • jarutil - creates and signs JARs, verifies JAR signatures

  • manifest - creates and queries JAR manifests

  • distinfo - prints information about a mixed multi-jar/class distribution, such as provides/requires lists.

  • distdiff - attempts to find differences between two distributions, deep-checking any JARs or Java class files found in either directory.

Additional References


Author: Christopher O'Brien

If you're interested in my other projects, feel free to visit my blog.

Original Git Repository:


This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, see

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