Create an error page for JSP pages

This is an example of how to create an error page in JSP pages. JavaServer Pages (JSP) is a server-side programming technology that enables the creation of dynamic, platform-independent method for building Web-based applications. Creating an error page implies that you should:

• Create a jsp page. Inside the <%code fragment%> scriptlet define the java code to be executed.
• Add any comments in the page inside the <%-- ... --%> tags.
• Then create the error page with a message in the <%code fragment%> scriptlet. Declare the page as error page using the <%@ page ... %> directive.

PageWithError.jsp

<%@ page errorPage="errorpage.jsp" %>
<%-- NullPointerException if the parameter param does not exist --%>
<%= request.getParameter("param").toString() %>

errorpage.jsp

		
<%@ page isErrorPage="true" %>

An error has occurred. The Exception was: <%= exception %>

URL:

http://myhost:8080/jcgsnippets/PageWithError.jsp

Output:

An error has occurred. The Exception was: java.lang.NullPointerException

  
This was an example of how to create an error page for JSP pages.