code: protected final void setPageId(String pageId) throws IllegalArgumentException {
          validateNotEmpty(pageId, "pageId");
          synchronized (this) {
              properties.put(Constants.SERVICE_PID, PAGE_ID + "/" + pageId);
          }
      }
docs: <p>setPageId.</p>
  
  @param pageId a {@link java.lang.String} object.
  @throws java.lang.IllegalArgumentException if any.