Rocoto is a horrible, horrible library. It uses com.google.inject.internal.util.$Preconditions, which you quite obviously should not do. This has been a known issue for years (https://github.com/99soft/rocoto/issues/7), but has not been fixed yet. In fact, the library is completely un-maintained with no commits since 2012. I would love it if we could get rid of this dependency since pulling it in is breaking my project.