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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 Recent projects use Struts, Spring, Hibernate, JBoss, Oracle Hibernate consulting thru HarpoonTech, a JBoss partner Summary Brief History of JSF Motivations for JSF, the Java Landscape JSF details Demo apps in MyFaces & Seam 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 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! 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! 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? 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... 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 typical JSF component tree View Form input input combo command 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!) MyFaces architecture J2EE server Faces Servlet my App base classes faces-config.xml 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 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 Seam Demo the Bean: User EJB3 the view : HTML and JSP the Action: Register SSB Seam in the faces-config.xml? Next for Seam? Reverse Engineering – make a whole app from a set of database tables 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 Seam architecture JSP Facelets Sun JSF RI MyFaces Seam Framework EJB3 Hibernate3 SQL DB Tomahawk Apache’s extended JSF components, ships with MyFaces Calendar Tree advanced inputText 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) 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 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 Questions? contact: Jay Meyer [email protected] 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