code: protected JCAConnectionFactoryMBeanImpl setConnectionFactoryChild(String key, JCAConnectionFactoryMBeanImpl cf) {
          return cfMBeanChildrenList.put(key, cf);
      }
docs: setConnectionFactoryChild add a child of type JCAConnectionFactoryMBeanImpl to this MBean.
  
  @param key the String value which will be used as the key for the JCAConnectionFactoryMBeanImpl item
  @param cf the JCAConnectionFactoryMBeanImpl 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.)