Travis builds complaining about broken repositories

In the recent travis logs there are lots of messages complaining about:

[WARNING] Failure to transfer commons-logging:commons-logging/maven-metadata.xml from https://nexus.codehaus.org/snapshots/ was cached in the local repository, resolution will not be reattempted until the update interval of codehaus-snapshots has elapsed or updates are forced. Original error: Could not transfer metadata commons-logging:commons-logging/maven-metadata.xml from/to codehaus-snapshots (https://nexus.codehaus.org/snapshots/): nexus.codehaus.org: unknown error

These don't occur for me locally and should be fixed.