code: public void initConfiguration() {
  
          // simple default configuration does not need to be initialized
          if (LOG.isDebugEnabled()) {
              LOG.debug(
                  org.opencms.configuration.Messages.get().getBundle().key(
                      org.opencms.configuration.Messages.LOG_INIT_CONFIGURATION_1,
                      this));
          }
          setFrozen(true);
      }
docs: Finalizes (freezes) the configuration of this scheduler job entry.<p>
  
  After this job entry has been frozen, any attempt to change the
  configuration of this entry with one of the "set..." methods
  will lead to a <code>RuntimeException</code>.<p>
  
  @see org.opencms.configuration.I_CmsConfigurationParameterHandler#initConfiguration()