@WebMethod(operationName = "ReadRole")
    public ArrayList<Role> ReadRole(@WebParam(name = "role_id") String role_id) {
            Role role  = new Role();
            ArrayList<Role> roles = new ArrayList<Role>();
            ArrayList<QueryCriteria> qc = new ArrayList<QueryCriteria>();
            if(!role_id.equals("-1")){
                qc.add(new QueryCriteria("role_id", role_id, Operand.EQUALS));
            }
            ArrayList<String> fields = new ArrayList<String>();
            ArrayList<QueryOrder> order = new ArrayList<QueryOrder>();
        try {
           roles = role.Read(qc, fields, order);
        } catch (SQLException ex) {
            Logger.getLogger(JAX_WS.class.getName()).log(Level.SEVERE, null, ex);
        }
            if(roles.isEmpty()){
                return null;
            }
        return roles;
    }