Comparing two .jar files
JAPICC, sample usage: japi-compliance-checker OLD.jar NEW.jar Sample reports for log4j: http://abi-laboratory.pro/java/tracker/timeline/log4j/ PkgDiff, sample usage: pkgdiff OLD.jar NEW.jar See sample report for args4j. Clirr, sample usage: java -jar clirr-core-0.6-uber.jar -o OLD.jar -n NEW.jar