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Jakarta EE Application Development

Jakarta EE Application Development

By : David R. Heffelfinger
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Jakarta EE Application Development

Jakarta EE Application Development

5 (2)
By: David R. Heffelfinger

Overview of this book

Jakarta EE stands as a robust standard with multiple implementations, presenting developers with a versatile toolkit for building enterprise applications. However, despite the advantages of enterprise application development, vendor lock-in remains a concern for many developers, limiting flexibility and interoperability across diverse environments. This Jakarta EE application development guide addresses the challenge of vendor lock-in by offering comprehensive coverage of the major Jakarta EE APIs and goes beyond the basics to help you develop applications deployable on any Jakarta EE compliant runtime. This book introduces you to JSON Processing and JSON Binding and shows you how the Model API and the Streaming API are used to process JSON data. You’ll then explore additional Jakarta EE APIs, such as WebSocket and Messaging, for loosely coupled, asynchronous communication and discover ways to secure applications with the Jakarta EE Security API. Finally, you'll learn about Jakarta RESTful web service development and techniques to develop cloud-ready microservices in Jakarta EE. By the end of this book, you'll have developed the skills to craft secure, scalable, and cloud-native microservices that solve modern enterprise challenges.
Table of Contents (18 chapters)
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15
Chapter 15: Putting it All Together

Request forwarding and response redirection

In many cases, one servlet processes form data, then transfers control to another servlet or JSP to do some more processing or displays a confirmation message on the screen. There are two ways of doing this: either the request can be forwarded or the response can be redirected to another servlet or page.

Request forwarding

Notice how the text displayed in the previous section’s example matches the value of the value attribute of the checkboxes that were clicked, and not the labels displayed on the previous page. This might confuse the users. Let’s modify the servlet to change these values so that they match the labels, then forward the request to another servlet that will display the confirmation message in the browser.

The doPost() method for the new version of MultipleValueFieldHandlerServlet is shown next:

protected void doPost(HttpServletRequest request, HttpServletResponse response) {
  String[] selectedOptions...

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