These microbenchmarks are from https://bitbucket.org/delors/cats/src/master/, repackaged as Maven projects in order to enable easier builds since I couldn't get the framework they presented working :) No code changes have been made to the actual microbenchmark code, and all credit should go to the original authors. Please cite the following paper if you use this benchmark:
Michael Reif, Florian Kübler, Michael Eichberg, Dominik Helm, and Mira Mezini. 2019. Judge: identifying, understanding, and evaluating sources of unsoundness in call graphs. Proceedings of the 28th ACM SIGSOFT International Symposium on Software Testing and Analysis. Association for Computing Machinery, New York, NY, USA, 251–261. https://doi.org/10.1145/3293882.3330555