code: public static BigDecimal getSelfConfigDecimal(String configAbsoluteClassPath, IConfigKey key) {
          OneProperties configs = otherConfigs.get(configAbsoluteClassPath);
          if (configs == null) {
              addSelfConfigs(configAbsoluteClassPath, null);
              configs = otherConfigs.get(configAbsoluteClassPath);
              if (configs == null) {
                  return VOID_CONFIGS.getDecimalConfig(key);
              }
          }
          return configs.getDecimalConfig(key);
      }
docs: Get self config decimal.
  
  @param configAbsoluteClassPath config path.
  @param key                     config key in configAbsoluteClassPath config file
  @return config BigDecimal value. Return null if not add config file or not config in config file.
  @see #addSelfConfigs(String, OneProperties)