code: @SuppressWarnings("unchecked")
      @Override
  	public <T extends ApiUser> List<T> getUsersInGroup(String groupId) {
  	    Collection<User> sfsUsers = getZone().getUsersInGroup(groupId);
  	    List<T> anwser = new ArrayList<>();
  	    for(User sfsUser : sfsUsers)
  	        if(sfsUser.containsProperty(APIKey.USER))
  	            anwser.add((T) sfsUser.getProperty(APIKey.USER));
  	    return anwser;
  	}
docs: /* (non-Javadoc)
  @see com.tvd12.ezyfox.core.entities.ApiZone#getUsersInGroup(java.lang.String)