Question

In my jsp page some pure java code there i.e, scriptlet. After a long time when refresh it then it is throwing

org.apache.jasper.JasperException: java.lang.NullPointerException 

Sometimes not for a long time also it is throwing same Exception. and the JSP page is displaying empty page. So the user have only one option is Logout. So to avoid that and redirect him to one page that is error page. How to do it ?

Answer 1

Form What I get here is, on refresh session values might be getting NULL after a certain period of time and thus resulting in NullPointerException .

Create a JSP page called error page and set

<%@page isErrorPage="true" %> 

In other JSP pages,

<%@page errorPage="error.jsp" %>

So, It will redirect to this page when any Run time error occurs in your JSP.

Note: This won’t redirect to error page if JSP has compile time error.