Java EE 8 Web Frameworks: A Look at JSF vs MVC
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The document provides an overview of JavaServer Faces (JSF) and MVC frameworks in Java EE 8, highlighting their features, architecture, and lifecycle. It discusses JSF's capabilities for building server-side user interfaces, including support for state management, data binding, and Ajax functionality, as well as MVC's action-oriented approach focusing on JAX-RS. Additionally, new features in JSF 2.3 and a comparison between JSF and MVC are presented, emphasizing their respective strengths in web application development.
Java EE 8 Web Frameworks: A Look at JSF vs MVC
- 1. Java EE 8 Web Frameworks A Look at JavaServer Faces vs MVC Josh Juneau
- 2. About Me • Member of JSF 2.3 (JSR 372) EG • Member of JSR 378 (Portlet 3.0 Bridge) EG • Developer/Analyst/DBA @ Fermilab • Apress Author • OTN/Java Magazine Contributor • Member of CJUG • Java EE Guardians
- 3. Agenda • Overview of JavaServer Faces & Demo • Overview of MVC & Demo • Feature Comparison • JSF 2.3 Feature Overview • Java EE 8 Overall Status
- 4. MVC Architecture • Model = Data • View = UI • Controller = Business Logic
- 5. JavaServer Faces Overview JavaServer Faces technology establishes the standard for building server-side user interfaces for Java EE. • An API for representing UI components and managing their state; handling events, server-side validation, and data conversion; defining page navigation; supporting internationalization and accessibility; and providing extensibility for all these features • JavaServer Faces (JSF) custom tag libraries for expressing UI components within a view and for wiring components to server-side objects
- 6. JavaServer Faces Overview The well-defined programming model and tag libraries significantly ease the burden of building and maintaining web applications with server-side UIs. With minimal effort, you can: • Drop components onto a page by adding component tags • Wire component-generated events to server-side application code • Bind UI components on a page to server-side data • Construct a UI with reusable and extensible components • Save and restore UI state beyond the life of server requests
- 7. JSF Models Data tier to work with entity classes (POJOs that map to database tables) to work with the underlying database from within a Java EE application. • EJBs…no…not J2EE!!!! • JAX-RS
- 8. JSF Views • Tree of Components • Facelets or HTML • Expression Language • Mix with JSTL and other tab libraries, as needed • Component Libraries
- 9. JSF Views
- 10. JSF Data Validation • Bean Validation • Faces Validator
- 11. JSF Controllers • Business logic - FacesServlet • CDI Scopes…No More JSF @ManagedBean • SessionScoped, ApplicationScoped, ViewScoped, RequestScoped, ConversationScoped, FlowScoped, Dependent, Singleton • Contextual…State Managed Across Requests
- 12. JSF Typical Form Submit Procedure • User completes form entry by populating form components. • User clicks a commandButton, which invokes a server-side method, and the CDI bean values are submitted to FacesServlet for processing. • Action method performs its work and then returns control to FacesServlet for navigation.
- 13. JSF Lifecycle • Restore View Phase • Apply Request Values Phase • Process Validations Phase • Update Model Values Phase • Invoke Application Phase • Render Response Phase
- 14. JSF Lifecycle
- 15. JSF Ajax Support • f:ajax for invoking server-side functionality • Many third-party UI frameworks
- 17. JSR 371: MVC 1.0 https://ozark.java.net/ • Action-oriented framework layered on top of JAX-RS • Manual controller logic…you control your own destiny! • No UI Components • You choose your front end technology
- 18. MVC 1.0 Models Utilize entity classes for data, or store into CDI bean Two ways to work with models: • javax.mvc.Models class • CDI-Based Models
- 19. MVC 1.0 Views ViewEngine Used to Merge Model and View • Utilize a number of different view technologies • Ozark Ships with 3 Implementations • Views reside within WEB-INF/views folder
- 20. MVC 1.0 Views
- 21. MVC 1.0 Validating Data • Manual Validation • Bean Validation
- 22. MVC 1.0 Controllers • Controls the request-processing for an MVC application. • JAX-RS Implementation • Class annotated with @Controller either at class level or method level. • Must be CDI Managed • Possible to create hybrid classes (@Controller at method level)
- 23. MVC 1.0 Controllers • Four return types: String, void, Response, Viewable • String: returns path to view • void: requires @javax.mvc.View annotation • Response: typical javax.ws.rs.core.Response, providing access to the response • Viewable: javax.mvc.Viewable containing information ab the view and how to process • Default response type text/html, but can be modified with @Produces
- 25. MVC 1.0 Views to Controllers - Parameters Parameters handled via annotations in Controller: • @PathParam: Used to extract path parameters • @FormParam: Used to process fields from form • @QueryParam: Used when parameters appended to URL • @BeanParam: Used to inject various request parameters into a bean
- 26. MVC 1.0 Views - Redirecting Responses • JAX-RS return Response.seeOther(URI.create(“redirectView”)).build() • MVC return “redirect:redirectView” @RedirectScoped Annotation • Bean will span at most two requests • Must be Serializable
- 27. MVC 1.0 Exception Handling • Can be applied via try/catch at method level or globally return Response.status(BAD_REQUEST).entity("error.jsp").build(); • ExceptionMapper class
- 28. MVC 1.0 Security • Utilize ${mvc.csrf.name} and ${mvc.csrf.token} in form • javax.mvc.security.CsrfProtection property • @CsrfValid Annotation at Method Level
- 29. MVC 1.0 MVC in Action!
- 30. JSF or MVC? JSF MVC • Component Based • Controller Logic Automates Processing • Facelets • Rapid Development • Works well with REST • Stateful…remains across requests • Action Based • Layered on Top of JAX-RS • Manual Validations/ Conversions • Many Different View Options • Fine Control Request/ Response • Great fit for REST • No State Across Requests
- 31. JSR 372: JSF 2.3 Not forgotten with Java EE 8 While scope of update is not very large, new features and enhancements will help continue making JSF relevant in today’s world. Thanks to the OmniFaces folks for adding a number of features to JSF.
- 32. JSF 2.3 in Java EE 8 • Two feature drivers: Oracle & Community • Feature clean-up • Small new feature set based upon community requests • Mature standard for building Java EE applications
- 33. JSF 2.3 - Oracle Focus Tie up loose ends: • Specification clarifications • CDI Alignment • Others Small Scale New Features: • CDI Managed Beans Only • Ajax Method Invocation • Multi-component Validation
- 34. JSF 2.3 - Community Focus • JSON Ajax Component Rendering • Stateless enhancements • GET Enhancements • Push Support
- 35. JSF 2.3 New Features (Implemented) • Inject ViewMap @ViewMap @Inject Map viewMap; • Inject UiViewRoot @Inject UIViewRoot viewRoot; • #1332 - Let CDI handle #{view} • #1331 - Let CDI handle #{application} • #1254 - contracts attribute too restrictive.
- 36. JSF 2.3 New Features (Implemented - ctd) • #1328 - Let CDI handle #{session} EL resolving • #1325 - Let CDI handle #{applicationScope} • #1311 - Let CDI handle #{facesContext} EL resolving • #1323 - Support @Inject for the applicationMap @ApplicationMap @Inject Map applicationMap; • #1322 - Simplify #{externalContext} to use ExternalContextProducer
- 37. JSF 2.3 New Features (Implemented - ctd) • #1309 - Support @Inject for ExternalContext @Inject ExternalContext externalContext; • #527 - Support @Inject for FacesContext @Inject FacesContext facesContext; • javax.faces.bean.ManagedProperty Replacement
- 38. JSF 2.3 New Features (Implemented - ctd) • #1396 - f:socket for SSE and WebSocket http://jj-blogger.blogspot.com/2016/02/a-look-at- upcoming-jsf-23-push-support.html
- 39. Learn More
- 40. What Is The CJUG? Chicago Java Users Group is dedicated to the helping you learn and network. • Technology community second to none. • Learn and contribute to Java / JVM ecosystem • Mentorship and career opportunities • Have fun and build cool things
- 41. Java EE Guardians Join us and help move Java EE into the future!
- 42. Contact Josh Juneau - Java EE 7 Recipes - Introducing Java EE 7 - JavaServer Faces: Introduction By Example - Java 8 Recipes Twitter: @javajuneau
- 43. Read On!