Fix javadoc build in jenkins with jdk6
Fix javadoc build in jenkins with jdk6

jorgemoralespou/rtgov,Governance/rtgov,objectiser/rtgov,jorgemoralespou/rtgov,objectiser/rtgov,Governance/rtgov,djcoleman/rtgov,jorgemoralespou/rtgov,djcoleman/rtgov,Governance/rtgov,djcoleman/rtgov,objectiser/rtgov,objectiser/rtgov,djcoleman/rtgov,jorgemoralespou/rtgov,Governance/rtgov