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Java Server Faces

Java Server Faces. St. Louis JavaSIG June 8, 2006 Jay Meyer, Harpoon Technologies. About Me. Master CS from Washington Univ. (wustl.edu) Software developer for 14 years (1992) Java Web development since 1999 Certified JBoss Application Developer

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Java Server Faces

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  1. Java Server Faces St. Louis JavaSIG June 8, 2006 Jay Meyer, Harpoon Technologies

  2. About Me • Master CS from Washington Univ. (wustl.edu) • Software developer for 14 years (1992) • Java Web development since 1999 • Certified JBoss Application Developer • Recent projects use Struts, Spring, Hibernate, JBoss, Oracle • Hibernate consulting thru HarpoonTech, a JBoss partner

  3. Summary • Brief History of JSF • Motivations for JSF, the Java Landscape • JSF details • Demo apps in MyFaces & Seam

  4. 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

  5. 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!

  6. 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!

  7. 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?

  8. 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 • extensible standard to allow growth (plugins) • and the main objective...

  9. 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

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

  11. How does Apache MyFaces work? • jar file for deployment on Tomcat or any J2EE container – myfaces-all.jar • Controller servlet, XML config file, JSP, a pile of base classes, and custom tags out the wazoo (of course! just like all the other frameworks!)

  12. MyFaces architecture J2EE server Faces Servlet my App base classes faces-config.xml

  13. MyFaces Demo • I used: Eclipse, Java5, JBoss 4 (JBossIDE) • Register a user • the Bean: Registration • the view : HTML and JSP • the Action Controller • the web.xml • faces-config.xml • navigation

  14. What is Seam? • Seam is a new product from JBoss, (OSS, free as in beer and speech) • Founded by Gavin King, Hibernate creator • uses Java5 and EJB3 • goal: use the exact same objects for persistence and rendering the view layer: abolish glue code and DTO objects • combines MyFaces, EJB3

  15. Seam Demo • the Bean: User EJB3 • the view : HTML and JSP • the Action: Register SSB • Seam in the faces-config.xml?

  16. Next for Seam? • Reverse Engineering – make a whole app from a set of database tables

  17. Facelets • Totally replace JSPs, uses XHTML instead • Integrates tightly with JSF • faster and leaner than JSPs – same idea as Tapestry • avoids serious JSP / JSF integration issues

  18. Seam architecture JSP Facelets Sun JSF RI MyFaces Seam Framework EJB3 Hibernate3 SQL DB

  19. Tomahawk • Apache’s extended JSF components, ships with MyFaces • Calendar • Tree • advanced inputText

  20. the Future • continued Component development, similar to taglib dev with Struts • more tool dev – Eclipse plugins, GUI designers • Facelets general acceptance instead of JSP • Seam innovation from Gavin King, JBoss also JSR 299 WebBeans just started • Shale? Will Craig McClanahan work on Shale or just Struts 2 Action (aka Webwork)

  21. Glossary • JSF – JavaServer Faces • JEE5 – the newest Java App Server spec, includes EJB3, JSF etc. • MyFaces – Apache’s JSF impl, completely replaces Sun’s ref impl for JSF • Tomahawk – Apache’s set of components to extend JSF, comes with MyFaces • Facelets – replacement for JSP, interprets XML instead of JSP files to produce web pages, integrated well with JSF • Seam – JBoss’ framework that works with JSF to provide the glue between JSF and EJB3 to reduce lines of code, includes MyFaces, Facelets (Gavin King’s project) • Shale – Apache Struts (Craig McClanahan) framework to provide a better API for JSF, competes with Seam, needs JDK5, not EJB3

  22. Resources • JavaServer Faces by Hans Bergsten, OReilly • http://java.sun.com/javaee/javaserverfaces/ • http://www.coreservlets.com/JSF-Tutorial/ • http://www.jboss.com/products/seam • http://docs.jboss.com/seam/reference/en/html/tutorial.html • http://struts.apache.org/struts-shale/index.html • http://www.jsfcentral.com/articles/facelets_1.html

  23. Questions? contact: Jay Meyer jmeyer@harpoontech.com discuss: Ideal architecture? Facelets, MyFaces, Seam, EJB3, JBossAS, MySQL, Ubuntu Linux? discuss: worst of breed? JSP, Struts 1.x, Sun JSF RI, Websphere, Toplink, DB/2, Windows

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