Fix broken jdk6 build on travis.
Fix broken jdk6 build on travis.

Murdock01/izpack,izpack/izpack,izpack/izpack,izpack/izpack,akuhtz/izpack,Murdock01/izpack,Murdock01/izpack,Murdock01/izpack,Murdock01/izpack,izpack/izpack,akuhtz/izpack,Murdock01/izpack,izpack/izpack,Murdock01/izpack,akuhtz/izpack,izpack/izpack,akuhtz/izpack,akuhtz/izpack,izpack/izpack,akuhtz/izpack,akuhtz/izpack