Book Image

Apache MyFaces 1.2 Web Application Development

Book Image

Apache MyFaces 1.2 Web Application Development

Overview of this book

Hypes and trends (such as Web 2.0) cause a change in the requirements for user interfaces every now and then. While a lot of frameworks are capable of meeting those changing requirements, it often means you as a developer need in-depth knowledge of web standards, such as XHTML and JavaScript. A framework like Apache MyFaces that hides all details of how the page is rendered at the client and at the same time offers a rich set of tools and building blocks could save you a lot of time, not only when you're building a brand new application but also when you're adapting an existing application to meet new user interface requirements.This book will teach you everything you need to know to build appealing web interfaces with Apache MyFaces and maintain your code in a pragmatic way. It describes all the steps that are involved in building a user interface with Apache MyFaces. This includes building templates and composition components with Facelets, using all sorts of specialized components from the Tomahawk, Trinidad, and Tobago component sets and adding validation with MyFaces Extensions Validator.The book uses a step-by-step approach and contains a lot of tips based on experience of the MyFaces libraries in real-world projects. Throughout the book an example scenario is used to work towards a fully functional application when the book is finished.This step-by-step guide will help you to build a fully functional and powerful application.
Table of Contents (22 chapters)
Apache MyFaces 1.2
Credits
About the Author
Acknowledgement
About the Reviewers
Preface
Trinidad Tags
Trinidad Text Keys
Default JSF Error Messages
ExtVal Default Error Messages

Limitations and problems


Although EJB 3.0 is a very elegant framework, it has some limitations. These limitations will not show up in simple applications like the one we used as an example in this book, but in real-life applications, they will.

Transactions

One of the limitations that you can come across when using JSF for the View and Controller, and EJB for the Model, is the lack of coordination between JSF and EJB when it comes to transactions. In databases, all changes to data happen within a transaction. In the example in this chapter, we updated a single row in the EMPLOYEES table. The container will simply start a transaction just before the update takes place, and close the transaction immediately after the update. But in more complex applications, it is often necessary to perform multiple actions within a single transaction. This is the case when related records are updated, added, or removed. A database transaction can only be closed if all of the constraints are satisfied.

For...