Java EE 6
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This document discusses the new features of Java EE 6, including Servlet 3.0, JAX-RS 1.1, JSF 2.0, JSR-330 (Dependency Injection), JSR-299 (CDI - Contexts and Dependency Injection), and CDI extensions. It provides examples of using these technologies in a sample e-commerce application called NovaShop, highlighting aspects like asynchronous servlets, RESTful web services, managed beans, dependency injection, and CDI extensions.
Java EE 6
- 1. Java EE 6 All Platform, no clutter @greyfairer
- 2. Agenda Servlet 3.0, JAX-RS 1.1, JSF 2.0 JSR-330 a.k.a. javax.inject JSR-299 a.k.a. CDI Arquillian CDI Extensions
- 3. Servlets 3.0 @WebServlet(name=”MyServlet”, urlPatterns={”/myApp/*”}) public class MyServlet extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse res) { ... @WebFilter( filterName="PaymentFilter", urlPatterns={"/*"}, servletNames={"PaymentServlet"}, ) public class PaymentFilter implements Filter { ...
- 4. Modular war's ● Jar's in WEB-INF/lib can also contain annotated servlet/filter/listener classes ● Jar's can also contribute META-INF/web.xml ● <web-fragment>...</web-fragment> ● Jar's can also contribute jsp's, static html ● In META-INF/resources
- 5. Servlet 3.0 and CDI ● If you have a WEB-INF/beans.xml, Web archives will be scanned for Managed Beans ● Can be injected in servlets, JAX-RS, JSF beans EJB CDI JPAJSF ... @Stateful @Stateless @Singleton @Produces @Named @Entity @Managed Bean ... EJB
- 6. Asynch Servlets @WebServlet(name="AsyncServlet", asyncSupported=true) public class AsyncServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) { final AsyncContext ac = request.startAsync(); ac.setTimeout(...) ac.start( new Runnable(){ ac.getResponse().getWriter()...; ac.complete(); });
- 7. Demo: Chat servlet ● Glassfish: asynch-request-war sample
- 8. JAX-RS 1.1 ● RESTfull Web Services ● Typical use: javascript clients ● GET/POST/PUT/DELETE resources ● URL encodes resource identification ● Encoding defined by MIME headers ● Class and/or method annotated with @Path ● Automatic JSON/XML encoding using JAXB
- 9. Demo: novashop ● From Adam Bien hacks ● http://kenai.com/projects/javaee-patterns/sources/hg/show/hacks/NovaShop ● @Path, @PathParam, @Produces, @Consumes annotation on WorkshopRegistration ● Use Chrome Advanced Rest Client
- 10. JSF 2.0 ● .xhtml view technology ● Uses JEE6 managed POJO’s ● @RequestScoped, @ConversationScoped, @Named ● New: call any method, even with parameters. ● Controllers: method calls on managed beans ● Bind form fields to bean properties – Typically @RequestScoped beans ● Implicit navigation using method’s returned value ● Redirect after post: ?faces-redirect=true
- 11. JSF 2.0 in Java EE 6 ● Supports javax.validation ● All @Named CDI beans are accessible ● Custom Components will use JAX-RS
- 12. Demo: novashop 2 ● From Adam Bien hacks ● http://kenai.com/projects/javaee-patterns/sources/hg/show/hacks/NovaShop ● Index.xhtml, registered.xhtml
- 13. JSR-330 a.k.a. javax.inject ● @Inject, @Qualifier, @Scope, etc. ● Standardized Dependency Injection API ● Reference Implementation: Google Guice 2.0 ● Also supported by Spring since 3.0 ● Defines API, not injector implementation or configuration
- 14. JSR-299 a.k.a. CDI ● Standardized dependency injection behaviour and configuration ● Required feature of any Java EE 6 container, including Web profile ● javax.enterprise.* package ● @Produces (evt. with InjectionPoint) ● Instance<> and @Alternative ● Event<> and @Observes
- 15. Demo: novashop 3 ● Configurator for maxNumberOfRegistrations
- 16. CDI Extensions ● CDI has Service Provider Interfaces ● Allows extensions drop-in ● http://groups.diigo.com/group/cdi-extensions ● Seam 3 and others ● https://github.com/CDISource/cdisource ● @Spring Spring to CDI bridge ● CDI to Spring: use JNDI Lookup.
- 17. Q & A