code: public static String getHavePathSelfConfig(IConfigKeyWithPath key) {
          String configAbsoluteClassPath = key.getConfigPath();
          return getSelfConfig(configAbsoluteClassPath, key);
      }
docs: Get self config string.
  
  @param key config key with configAbsoluteClassPath in config file
  @return config value string. Return null if not add config file or not config in config file.
  @see #addSelfConfigs(String, OneProperties)