// retrieves @siena.DateTime value
AnnotationsAttribute attr = getAnnotations(cf);
// adds @play.data.binding.As(lang={"*"}, value={"yyyy-MM-dd HH:mm:ss"})
Map<String, MemberValue> map = new HashMap<String, MemberValue>();
ConstPool cp = attr.getConstPool();
// creates lang array
MemberValue[] langArray = new MemberValue[1];
langArray[0] = new StringMemberValue("*", cp);
ArrayMemberValue langMember = new ArrayMemberValue(cp);
langMember.setValue(langArray);