Force compilation with Java 6 compatibility
Force compilation with Java 6 compatibility

Change-Id: I4f656f8b44c5dcc276ad07dd05e61a18e174ab39

ow2-proactive/scheduling-portal,ShatalovYaroslav/scheduling-portal,ShatalovYaroslav/scheduling-portal,lpellegr/scheduling-portal,sandrineBeauche/scheduling-portal,lpellegr/scheduling-portal,laurianed/scheduling-portal,ow2-proactive/scheduling-portal,sandrineBeauche/scheduling-portal,lpellegr/scheduling-portal,ow2-proactive/scheduling-portal,sandrineBeauche/scheduling-portal,paraita/scheduling-portal,laurianed/scheduling-portal,paraita/scheduling-portal,paraita/scheduling-portal,laurianed/scheduling-portal,ShatalovYaroslav/scheduling-portal