Clirr

net.sf.clirr » clirr-core

Clirr is a tool that checks Java libraries for binary compatibility with older releases. Basically you give it two sets of jar files and Clirr dumps out a list of changes in the public api. Clirr provides an Ant task that can be configured to break the build if it detects incompatible api changes. In a continuous integration process Clirr can automatically prevent accidental introduction of binary compatibility problems in Java libraries.