code: public Response updateRosterEntry(String username, RosterItemEntity rosterItemEntity) {
  		return restClient.put("users/" + username + "/roster/" + rosterItemEntity.getJid(), rosterItemEntity,
  				new HashMap<String, String>());
  	}
docs: Update roster entry.
  
  @param username
  the username
  @param rosterItemEntity
  the roster item entity
  @return the response