code: @SuppressWarnings("unchecked")
      private Map<String, List<Object[]>> _getDebugInfoMap()
      {
          Map<String, Object> requestMap = getFacesContext()
                  .getExternalContext().getRequestMap();
          Map<String, List<Object[]>> debugInfo = (Map<String, List<Object[]>>) 
                  requestMap.get(DEBUG_INFO_KEY + getClientId());
          if (debugInfo == null)
          {
              // no debug info available yet, create one and put it on the attributes map
              debugInfo = new HashMap<String, List<Object[]>>();
              requestMap.put(DEBUG_INFO_KEY + getClientId(), debugInfo);
          }
          return debugInfo;
      }
docs: Returns the debug-info Map for this component.
  @return