You can use the <jsp:fallback> action only in the body of a <jsp:plugin> action. Its body specifies the template text to use for browsers that do not support the HTML <embed> or <object> elements. This action supports no attributes.

Example:

<jsp:plugin type="applet" code="Clock2.class" 
  codebase="applet" 
  jreversion="1.2" width="160" height="150" >
  <jsp:fallback>
    Plug-in tag OBJECT or EMBED not supported by browser.
  </jsp:fallback>
</jsp:plugin>