code: protected JDBCDataSourceMBeanImpl setDataSourceChild(String key, JDBCDataSourceMBeanImpl ds) {
          return dataSourceMBeanChildrenList.put(key, ds);
      }
docs: setDataSourceChild add a child of type JDBCDataSourceMBeanImpl to this MBean.
  
  @param key the String value which will be used as the key for the JDBCDataSourceMBeanImpl item
  @param ds the JDBCDataSourceMBeanImpl value to be associated with the specified key
  @return The previous value associated with key, or null if there was no mapping for key.
  (A null return can also indicate that the map previously associated null with key.)