code: public static void setSystemConfigs(String systemConfigAbsoluteClassPath, OneProperties systemConfigsObj) {
          if (systemConfigsObj != null) {
              Configs.systemConfigs = systemConfigsObj;
          }
          if (systemConfigAbsoluteClassPath != null) {
              Configs.systemConfigAbsoluteClassPath = systemConfigAbsoluteClassPath;
              Configs.systemConfigs.initConfigs(Configs.systemConfigAbsoluteClassPath);
          } else if (systemConfigsObj != null) { // use new systemConfigs, need initConfigs.
              Configs.systemConfigs.initConfigs(Configs.systemConfigAbsoluteClassPath);
          }
      }
docs: <p>Set self define system configs.</p>
  Can use self system configs path or self class extends {@link OneProperties}.
  
  @param systemConfigAbsoluteClassPath self system configs absolute class path.
  Can be null, if null means use
  default path "{@value #DEFAULT_SYSTEM_CONFIG_ABSOLUTE_CLASS_PATH}"
  @param systemConfigsObj              self class extends {@link OneProperties}.
  Can be null, if null means not use self class.
  @see OneProperties