Java Server Pages (JSP) could handle any erros that might be arised in scriptlets, expressions, or other JSP elements. You could use try/cacth blocks to handle any known erros. In this technic we could use to display a custom error on our file where unhandled exception is thrown.

Step 1.

Add this line on your first line of your page :

<%@ page errorPage="our_error_page.jsp" %> 
You could and should chnage the name of our error page. 

Step 2.

Let's add some Java codes which are containing some errors :

<%

private int intCounter;

intCounter = "Hello Word!"

%>

Step 3.

In previous step we make a stupid coding error. But when client browse to page, JSP server will redirect page to our error page. Here is our error page codes :

1.  <%@ page isErrorPage="true" %>
2. 
3.    An unexcepted error occurred. The name of the exception is:
4.    
5.    <%= exception %>

First line (Line 1), describes that this page is an error page and must track last error on Java codes. 3. line is ouw message. Line 5 displays error coming from our Java Server Page. If you wish your client does not know the error message just delete it.

Happy Coding !