Have you tried using the no-cache commands in your HTML and JSP pages?
IE and Netscape each have META tags that will stop the page beiong cached, and the JSP page will also have a command (in asp pages it is <% Response.Expires=0 %>)
For Navigator and IE browsers, add <HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE"> in the HEAD section of the HTML . For IE, and if your whole page is < 64KB, ALSO add a HEAD section to the END of the HTML page like this.
<HTML>
<HEAD>
<META HTTP-EQUIV="REFRESH" CONTENT="5">
<TITLE> blah blah blah </TITLE>
</HEAD>
<BODY>
This is an example of where to place the second header section<br>
so that the "Pragama, No-Cache" metatag will work as it is supposed to.<br>
</BODY>
<HEAD>
<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">
</HEAD>
</HTML>