Fix error message if build is started with an old java version
Fix error message if build is started with an old java version

GregDThomas/Openfire,GregDThomas/Openfire,guusdk/Openfire,Gugli/Openfire,akrherz/Openfire,guusdk/Openfire,igniterealtime/Openfire,Gugli/Openfire,igniterealtime/Openfire,speedy01/Openfire,GregDThomas/Openfire,guusdk/Openfire,guusdk/Openfire,Gugli/Openfire,speedy01/Openfire,GregDThomas/Openfire,akrherz/Openfire,akrherz/Openfire,speedy01/Openfire,speedy01/Openfire,speedy01/Openfire,GregDThomas/Openfire,Gugli/Openfire,Gugli/Openfire,akrherz/Openfire,guusdk/Openfire,igniterealtime/Openfire,igniterealtime/Openfire,igniterealtime/Openfire,akrherz/Openfire