exception in validation mechanism

[Jignesh Patel]

Dear Friends,
While showing error messages on jsp,
I got following exception while loading page, can anybody guide what is the reason for the exception.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.NullPointerException
org.apache.struts.util.RequestUtils.pageURL(RequestUtils.java:1596)
org.apache.struts.util.RequestUtils.computeURL(RequestUtils.java:541)
org.apache.struts.taglib.html.RewriteTag.doStartTag(RewriteTag.java:99)
org.apache.jsp.pages.index_jsp._jspx_meth_html_rewrite_0(index_jsp.java:124)
org.apache.jsp.pages.index_jsp._jspService(index_jsp.java:89)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note

[lee anthony]

hi friend
ur exception tells only about null ponter exception
it might be becaz several reason like request set attribute might not be available to the page which u have requested for
please clarify futher what is that uwere tying to do
lee