Book Image

Digital Java EE 7 Web Application Development

By : Peter Pilgrim
Book Image

Digital Java EE 7 Web Application Development

By: Peter Pilgrim

Overview of this book

Digital Java EE 7 presents you with an opportunity to master writing great enterprise web software using the Java EE 7 platform with the modern approach to digital service standards. You will first learn about the lifecycle and phases of JavaServer Faces, become completely proficient with different validation models and schemes, and then find out exactly how to apply AJAX validations and requests. Next, you will touch base with JSF in order to understand how relevant CDI scopes work. Later, you’ll discover how to add finesse and pizzazz to your digital work in order to improve the design of your e-commerce application. Finally, you will deep dive into AngularJS development in order to keep pace with other popular choices, such as Backbone and Ember JS. By the end of this thorough guide, you’ll have polished your skills on the Digital Java EE 7 platform and be able to creat exiting web application.
Table of Contents (21 chapters)
Digital Java EE 7 Web Application Development
Credits
About the Author
Acknowledgment
About the Reviewers
www.PacktPub.com
Preface
Index

Handling view expired


I promised you that we would add some finesse to our digital application. If you've worked with JSF for a while, you probably have your fair share of stack traces with javax.faces.application.ViewExpiredException as the root cause. This is one of the most notorious exceptions. You could increase the HTTP Session lifetime in order to compensate for an out-of-date request, but how long is break away from the computer for an average person? Meanwhile, the objects would persist in the memory. There is a better way and that is by using the Web XML deployment descriptor.

Inside the applications web.xml file, we need to trigger a redirection to a more pleasant error page. The following is an extract of the XML file:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" ...>
  <!-- ... -->
  <error-page>
    <exception-type>
    javax.faces.application.ViewExpiredException
    </exception-type>
    <location...