code: public void setMessage(CmsMessageContainer message) {
  
          if ((message != null) && (message.getKey() != Messages.ERR_MULTI_EXCEPTION_1)) {
              m_individualMessage = true;
              m_message = message;
          } else {
              // if message is null, reset and use default message again
              m_individualMessage = false;
              updateMessage();
          }
      }
docs: Sets an individual message for the multi exception base message.<p>
  
  If no individual message has been set, a default message using the key
  <code>{@link org.opencms.main.Messages#ERR_MULTI_EXCEPTION_1}</code> will be used.<p>
  
  If <code>null</code> is given as parameter, any individual message that
  has been set is reset to the default message.<p>
  
  @param message the message to set