code: public void initPage() throws CmsException {
  
          if ((m_page == null) && (m_cms != null)) {
              String requestUri = m_cms.getRequestContext().getUri();
              // get the container page itself, checking the history first
              CmsResource pageResource = (CmsResource)CmsHistoryResourceHandler.getHistoryResource(m_request);
              if (pageResource == null) {
                  pageResource = m_cms.readResource(requestUri);
              }
              m_page = getPage(pageResource);
              m_page = CmsTemplateMapper.get(m_request).transformContainerpageBean(
                  m_cms,
                  m_page,
                  pageResource.getRootPath());
  
          }
      }
docs: Initializes the requested container page.<p>
  
  @throws CmsException in case reading the requested resource fails