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

Using Bean Validation


Using annotations in JavaBeans is an elegant way of defining validation rules in a declarative way. Apart from MyFaces ExtVal there are other projects that introduced declarative validation, such as the Hibernate Validator and the Bean Validation Framework for Spring. Some framework developers realized that it would be a good idea to standardize this type of validation. This led to the Bean Validation specification that was developed as JSR 303 in the Java Community Process. Accordingly, Bean Validation will be a standard part of Java EE 6, but it can be used in Java EE 5 by manually including a Bean Validation implementation.

One of the benefits of having an official standard for validation is that various user interface frameworks can implement support for this type of validation. For example, JavaServer Faces 2.0 will have support for Bean Validation embedded in it, and other UI frameworks will probably follow.

But at the moment, we’re still building Java EE 5 and...