Beginning Java EE 6 with GlassFish 3, Second Edition

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C H A P T E R 12■ ■ ■Processing and NavigationIn the previous chapter, I showed you how to create web pages using different technologies (HTML, JSP,JSTL, etc.), knowing that JSF is the preferred Java EE specification for writing modern web applications.However, drawing pages with graphical components is not enough; these pages need to interact with aback-end system, navigate through pages, and validate and convert data. JSF is a rich specification:managed beans allow you to invoke the business tier and to navigate in your application, and a set ofclasses allow you to convert component values to and from a corresponding type or validate them toconform to business rules. With the use of annotations, it is now easy to develop custom converters andvalidators.JSF 2.0 brings simplicity and richness in terms of dynamic user interfaces. It natively supports Ajaxcalls in a simple manner. The specification comes with a JavaScript library, allowing asynchronous callsto the server and refreshing small portions of the page.Creating user interfaces, controlling navigation in the entire application, and calling business logicsynchronously or asynchronously are possible because JSF is built on the Model-View-Controller (MVC)design pattern. Each part is separate from the other, allowing the UI to change without impacting thebusiness logic and vice versa.This chapter will present all these concepts, complementing the previous chapters.The MVC PatternJSF, and most web frameworks, encourage separation of concerns by using variations of the MVC designpattern. MVC is an architectural pattern used to isolate business logic from user interface. Business logicdoesn’t mix well with user interface code. When the two are mixed, applications are much harder tomaintain and less scalable. In the “JavaServer Pages” section in Chapter 11, I showed you a JSP with Javacode and SQL statements. Though technically correct, you can imagine how difficult it would get tomaintain with time. The page mixes two developer roles (graphic designer and business logic developer),and it could end up using many more APIs (database access, EJB invocation, and so on), handlingexceptions, or processing complex business logic. All that would result in a very complex web page.When MVC is applied, it results in a loosely coupled application; with this type of application, it is easierto modify either the visual appearance of the application or the underlying business rules without oneaffecting the other.In MVC, the model represents the data of the application, the view corresponds to the userinterface, and the controller manages the communication between both (see Figure 12-1).345
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The EXPERT’s VOIce ® in Java tm
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Beginning Java EE 6 Platform with G
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Contents at a Glance■Foreword ...
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■ CONTENTSSummary ...............
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■ CONTENTSBulk Update ...........
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■ CONTENTSStateful . ............
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■ CONTENTSScripting Elements ....
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■ CONTENTSMDB Model .............
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■ CONTENTSFrom the Web to Web Ser
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About the Author■ Antonio Goncalv
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AcknowledgmentsWriting a book about
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■ PREFACECONTENTSChapter 1 briefl
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C H A P T E R 1■ ■ ■Java EE 6
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CHAPTER 1 ■ JAVA EE 6 AT A GLANCE
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CHAPTER 2 ■ JAVA PERSISTENCEJPA S
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CHAPTER 2 ■ JAVA PERSISTENCEEclip
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CHAPTER 2 ■ JAVA PERSISTENCEusing
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CHAPTER 2 ■ JAVA PERSISTENCEFigur
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CHAPTER 2 ■ JAVA PERSISTENCENote
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CHAPTER 2 ■ JAVA PERSISTENCE■ N
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CHAPTER 2 ■ JAVA PERSISTENCERunni
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CHAPTER 2 ■ JAVA PERSISTENCE@Befo
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CHAPTER 2 ■ JAVA PERSISTENCERunni
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CHAPTER 3 ■ OBJECT-RELATIONAL MAP
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C H A P T E R 4■ ■ ■Managing
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CHAPTER 4 ■ MANAGING PERSISTENT O
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C H A P T E R 5■ ■ ■Callbacks
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CHAPTER 5 ■ CALLBACKS AND LISTENE
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CHAPTER 6 ■ ENTERPRISE JAVA BEANS
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C H A P T E R 7■ ■ ■Session B
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CHAPTER 7 ■ SESSION BEANS AND THE
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C H A P T E R 8■ ■ ■Callbacks
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CHAPTER 8 ■ CALLBACKS AND INTERCE
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C H A P T E R 9■ ■ ■Transacti
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CHAPTER 9 ■ TRANSACTIONS AND SECU
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CHAPTER 10 ■ JAVASERVER FACESUnde
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CHAPTER 10 ■ JAVASERVER FACESList
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CHAPTER 10 ■ JAVASERVER FACESList
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CHAPTER 10 ■ JAVASERVER FACESJSR
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CHAPTER 10 ■ JAVASERVER FACESWrit
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CHAPTER 10 ■ JAVASERVER FACESpubl
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CHAPTER 10 ■ JAVASERVER FACES•
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CHAPTER 10 ■ JAVASERVER FACESAPre
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CHAPTER 13 ■ SENDING MESSAGES1. O
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CHAPTER 13 ■ SENDING MESSAGESSele
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CHAPTER 13 ■ SENDING MESSAGESFigu
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CHAPTER 13 ■ SENDING MESSAGESList
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CHAPTER 13 ■ SENDING MESSAGESLife
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CHAPTER 13 ■ SENDING MESSAGES}sen
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CHAPTER 13 ■ SENDING MESSAGESGo t
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C H A P T E R 14■ ■ ■SOAP Web
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CHAPTER 14 ■ SOAP WEB SERVICESuse
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CHAPTER 14 ■ SOAP WEB SERVICES•
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CHAPTER 14 ■ SOAP WEB SERVICESSOA
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CHAPTER 14 ■ SOAP WEB SERVICESas
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CHAPTER 14 ■ SOAP WEB SERVICESLif
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CHAPTER 14 ■ SOAP WEB SERVICESIf
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CHAPTER 14 ■ SOAP WEB SERVICES}}C
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CHAPTER 14 ■ SOAP WEB SERVICESTo
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C H A P T E R 15■ ■ ■RESTful
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CHAPTER 15 ■ RESTFUL WEB SERVICES
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Index■ Symbols. (dot operator), t
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■ INDEXbooks.xml file, 320BookTes
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■ INDEXcontainer-managed environm
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■ INDEX3.1 specification new feat
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■ INDEX■ GGamma, Erich, 27@Gene
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■ INDEXimages, HTML component for
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■ INDEXJavaScript, 304-6JavaScrip
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■ INDEX element (HTML), 333listBo
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■ INDEXobject-relational mapping
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■ INDEXREFRESH cascade type, 141r
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■ INDEXSOAP (Simple Object Access
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■ INDEXVDL. See view declaration
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