docs: public JdbcConnectionDescriptor addDescriptor(String jcdAlias, DataSource dataSource, String username, String password)
      {
          JdbcConnectionDescriptor jcd = new JdbcConnectionDescriptor();
  
          jcd.setJcdAlias(jcdAlias);
          jcd.setDataSource(dataSource);
          if (username != null)
          {
             jcd.setUserName(username);
             jcd.setPassWord(password);
          }
          utils.fillJCDFromDataSource(jcd, dataSource, username, password);
          if ("default".equals(jcdAlias))
          {
              jcd.setDefaultConnection(true);
              // arminw: MM will search for the default key
              // MetadataManager.getInstance().setDefaultPBKey(jcd.getPBKey());
          }
          addDescriptor(jcd);
          return jcd;
      }