Maven enforcer is a good idea for sure, but as I recall it just notifies you of a version issue, and allows you to explicitly select one or the other. Sadly, t

Maven enforcer is a good idea for sure, but as I recall it just notifies you of a version issue, and allows you to explicitly select one or the other. Sadly, these breaking changes can be mutually exclusive: e.g. a method was renamed that A & B both use, so no matter which version you pick something fails. I remember once having to do a binary search through versions of Guava to find one between 15 and 18 that happened to be the one that was "just right".