I'd like to share my results on API changes analysis for the Errai Bus library: https://abi-laboratory.pro/java/tracker/timeline/errai-bus/
The report is generated by the https://github.com/lvc/japi-compliance-checker tool for jars found at Central Repository: org/jboss/errai/errai-bus according to https://wiki.eclipse.org/Evolving_Java-based_APIs_2.
The report is updated several times a week. Hope it will be helpful for users and maintainers of the library.
Report for Errai Common: https://abi-laboratory.pro/java/tracker/timeline/errai-common/