code: public static boolean isRunningOnGoogleAppEngine(
              ServletContext servletContext)
      {
          if (runningOnGoogleAppEngine != null)
          {
              return runningOnGoogleAppEngine.booleanValue();
          }
          else
          {
              return isServerGoogleAppEngine(servletContext.getServerInfo());
          }
      }
docs: Returns true if running on Google App Engine (both production and development environment).
  <p>If this method returns true, then
  <ul>
  <li>MyFaces is initialized as in JSP 2.0 or less environment.</li>
  <li>Last modification check of faces config is not done during update.</li>
  </ul>