I added Maven -U (force snapshot update) to the geoserver-{master,2.13.x,2.12.x}-nightly builds because I have seen stale GeoTools snapshots used when GeoTools built on one slave and the geoserver-master-app-schema-online built on the other slave without -U, and the nightly builds are also likely affected. Please watch out for unintended side-effects.
Kind regards,
--
Ben Caradoc-Davies <ben@anonymised.com>
Director
Transient Software Limited <https://transient.nz/>
New Zealand