buildbot failure in on wicket-master

[buildbot]

The Buildbot has detected a new failure on builder wicket-master while building 
. Full details are available at:
    https://ci.apache.org/builders/wicket-master/builds/1410

Buildbot URL: https://ci.apache.org/

Buildslave for this Build: bb_slave6_ubuntu

Build Reason: forced: by IRC user <martin-g> on channel ##wicket: None
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: failed compile

Sincerely,
 -The Buildbot