I tried to do the same process in Mac, and everything seems fine.

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.008 s
[INFO] Finished at: 2014-09-01T16:12:53+08:00
[INFO] Final Memory: 73M/411M
[INFO] ------------------------------------------------------------------------
**SUCCESS** PicketLink has been updated. Version is [2.7.0.Beta1].
**SUCCESS** PicketLink Identity Management has been installed. Using Identity Store [jpa].
**SUCCESS** JPA Identity Store has been configured.
**SUCCESS** Basic Identity Model has been configured.
**SUCCESS** EJB has been installed.

So, is it an environment-related problem?