[MNG-5780] upgrade Java minimum version prerequisite from Java 6 to Java 7 Also update build.xml, which is used by https://builds.apache.org
[MNG-5780] upgrade Java minimum version prerequisite from Java 6 to Java 7
Also update build.xml, which is used by https://builds.apache.org

xasx/maven,Mounika-Chirukuri/maven,skitt/maven,mizdebsk/maven,likaiwalkman/maven,pkozelka/maven,rogerchina/maven,apache/maven,keith-turner/maven,pkozelka/maven,dsyer/maven,trajano/maven,keith-turner/maven,skitt/maven,karthikjaps/maven,changbai1980/maven,mcculls/maven,rogerchina/maven,wangyuesong0/maven,cstamas/maven,rogerchina/maven,atanasenko/maven,likaiwalkman/maven,aheritier/maven,wangyuesong/maven,dsyer/maven,josephw/maven,changbai1980/maven,aheritier/maven,aheritier/maven,josephw/maven,keith-turner/maven,wangyuesong/maven,olamy/maven,ChristianSchulte/maven,wangyuesong0/maven,mcculls/maven,barthel/maven,wangyuesong/maven,wangyuesong0/maven,changbai1980/maven,olamy/maven,trajano/maven,njuneau/maven,trajano/maven,atanasenko/maven,xasx/maven,josephw/maven,Mounika-Chirukuri/maven,pkozelka/maven,vedmishr/demo1,stephenc/maven,njuneau/maven,lbndev/maven,mizdebsk/maven,karthikjaps/maven,barthel/maven,mizdebsk/maven,dsyer/maven,ChristianSchulte/maven,apache/maven,vedmishr/demo1,lbndev/maven,apache/maven,xasx/maven,ChristianSchulte/maven,stephenc/maven,vedmishr/demo1,kidaa/maven-1,atanasenko/maven,cstamas/maven,barthel/maven,stephenc/maven,njuneau/maven,kidaa/maven-1,mcculls/maven,olamy/maven,Mounika-Chirukuri/maven,lbndev/maven,skitt/maven,likaiwalkman/maven,kidaa/maven-1,cstamas/maven,karthikjaps/maven