code: public void addEventManager(String clazz) {
  
          try {
              m_eventManager = (CmsEventManager)Class.forName(clazz).newInstance();
              if (CmsLog.INIT.isInfoEnabled()) {
                  CmsLog.INIT.info(
                      Messages.get().getBundle().key(Messages.INIT_EVENTMANAGER_CLASS_SUCCESS_1, m_eventManager));
              }
          } catch (Throwable t) {
              LOG.error(Messages.get().getBundle().key(Messages.INIT_EVENTMANAGER_CLASS_INVALID_1, clazz), t);
              return;
          }
      }
docs: Adds the event manager class.<p>
  
  @param clazz the class name of event manager class  to instantiate and add