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Java Server Faces (JSF ) Next Generation User Interface

Java Server Faces (JSF ) Next Generation User Interface. Saif Kamaal. About Me. Masters in Computer Applciation from Mumbai University. Software developer for 3 years (2007) Java Web development since 2006 SCJP, SCWCD, Weblogic Certified.

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Java Server Faces (JSF ) Next Generation User Interface

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  1. Java Server Faces (JSF)Next Generation User Interface SaifKamaal

  2. About Me • Masters in Computer Applciation from Mumbai University. • Software developer for 3 years (2007) • Java Web development since 2006 • SCJP, SCWCD, Weblogic Certified. • Recent projects use JSF- Richfaces, Hibernate, JBoss, Oracle • Working on Code Generation.

  3. Summary • Brief History of JSF. • Motivations for JSF, the Java Landscape. • JSF details. • Demo apps in JSF and Richfaces.

  4. How UI Framework originated? • Tradition applications were desktop applications based on AWT and then Swing. • The origin of internet and increase in the number of clients gave rise to web based applications. • Traditional web based applications were written in servlets (still a number of projects are based on servlets). • Then came JSP and people said “We have got what we always wanted” – no sooner they realized how wrong they were . • Some technologies came here and went like light.

  5. Application Development a Layered Approach

  6. Why go for a Layered Approach ? • strategic separation of different elements • each layer is organized to provide support and base functionality to the next • easier to solve multiple small problems than fewer big ones • mitigates risk of technological evolution • value in consistency helps maintenance

  7. A Common Layer Stack

  8. Benefits of a Layered Approach • Change to a different Data Source with minimal effort - through Data Access Layer • Add new Deployment Options - e.g. Add a Web Services Layer over the Business Services Layer • Storage & Data Structures are independent of the Presentation Layer • and so on …

  9. Layer Deployments on Tiers • Layers reside on the same machine, same runtime and any object visible to one layer can be passed to the other either by Value or by Reference. • Tiers could be on different machines or on different runtimes, hence the data has to passed by Value only - as serialized objects.

  10. Issues with Servlet • In terms of creating a Grapical user interface,servlet is tough to use.Because you have to write huge code to send html text to client. • No separation of concern. Java and HTML mix. • Change in presentation part also required compiling the whole servlet. • And the list goes on….

  11. Sample Servlet Code

  12. Issues with JSP • JSP were created beacause complaints of developers like me and you who were tired of typing out.println("<HTML><HEAD><TITLE>" + pageInfo.getTitle() + "</TITLE></HEAD>"); into their servlet code. • To solve the problem of separation of concerns but … • And so on..

  13. Sample JSP Code

  14. Enters JSF Next Generation User Interface SaifKamaal Emirates Group IT

  15. What is Java Server Faces? • JSF is a spec which defines a component-based MVC framework • JSF 1.2 is included in the larger JEE5 spec • The spec was developed by involving many people from orgs like Sun, Apache, IBM, Oracle • Not tied to a Web framework, nor a thick-client GUI – theoretically could be applied to either • Implementations, frameworks: • Sun RI vs. Apache MyFaces • JBoss Seam vs. Apache Struts 2 Shale • IBM, Oracle have proprietary solutions

  16. The Problem with Web apps • HTML? HTML? Java people like Objects, HTML is not Objects • Web programming is more difficult than GUI programming • Java programming is hard – and J2EE is even more difficult: Servlets? JSP? EJBs!?! • Microsoft has VisualStudio which turns web programming into drag-and-drop, that looks easy! 10 minute demo!

  17. Answer: a Framework!(yet another framework, of course) • Struts – reduced lines of code, made apps pretty complex, created a niche of skilled Struts mercenaries • WebWork – fixed some of the Struts hassle • SpringMVC – brought powerful AOP concepts to web dev • Tapestry – JSP? dump it, XML rules!

  18. MVC WARS • any Web apps in 2006 means seeing a mix of Struts, Tapestry, Spring MVC, and Webwork (consultant: which one pays the best?) • the battle rages on, who will win? how can you tell who won? Trust Craig? Trust Rod? How can a OSS project define victory? • Converting legacy apps: Struts is dead! long live Struts 2 Action and Struts 2 Shale!!! • How can I possibly pick one for a new project, when the technology is under attack?

  19. JSF to the rescue • Make Committees, Not War! • get the big players together to solve MVC problems in a standard way, argue, compromise, repeat... publish final Spec • Use components, not actions, more like Swing, less like Struts • Set a standard so we can build derivative products like IDEs with drag-n-drop ease, without worrying about change • The differentiator that JSF brings, which other similar frameworks do not have, is the backing of a standard specification (JSR127). • Because JSF is part of the J2EE standard specification, it is a top priority for every major J2EE tools vendor in the market (including Oracle, IBM, Borland, and Sun) to support it, which in turn will guarantee a wide adoption • and good tools support. • and the main objective...

  20. We will hit the target !!!!

  21. 3 Tier Application

  22. MVC – not again …

  23. How the two brothers are different?

  24. How the JSF Specification Fits In

  25. errr... What’s a component? • the JSF spec defines a standard set of components and relationships • the View layer (e.g. JSP) and the Java code on the server use these components to interact and pass data • JSF tree is the current set of components in a Java object graph • Struts, Webwork, SpringMVC use actions, not components

  26. typical JSF component tree View Form input input combo command

  27. Enough of blabla..some real action please • Setup tools like Eclipse 3.5, Maven, 2.x, Tomcat/JBoss. • Download the jsf jars. • Additionally can use JBoss Tools.

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