JarCompare is a tool for java developers and build engineers. It allows comparing of classes inside java JAR archives and displaying specific differences in class files
The tool decompiles the class files and disp

JarCompare is useful for:

Determining if there were any changes between software releases or builds -- without having to store source code for every release
Tracking changes in 3rd party jars your software is using

Q&A

Q: How does it differ from zdiff and other archive comparison programs?
A: JarCompare knows it deals with java class files and can show differences in source lines. It compares decompiled java classes files. Note that the same java source file compiled twice results in two DIFFERENT java class files, since there is a unique timestamp embedded in the file


Q: Why compare classes if you always have sources?
A: Not always. For example you may have two versions of a 3rd party jar, one works with your code, the other does not. Also, many companies only archive binary builds. It is possible to rertieve source from your version control system, but it may be easier to just compare jars


Q: Is it written in pure java?
A: It is. But it is also using external diff tool of your choice


Q: What JDK version does it require?
A: Sun JDK 1.4.2 or better

Q: Can it work with a JRE?
A: No, it depends on tools.jar, so full JDK is needed

Q: Can I download it and what does it cost?
A: See the download link below. The product is free for personal use and requires a license for corporate use. A license costs $125 per server/desktop. You will receive a license certificate after payment