Agilité des applications Java EE 6

Transcription

1 Agilité des applications Java EE 6 Guillaume Sauthier, Bull, OW2 TC Chairman guillaume.sauthier@ow2.org

2 Agenda Java EE 6 Main goals Agile? Web Profile What's inside? Benefits

3 Java EE 6 > Main goals Ease of Development Continued from Java EE 5 Annotation driven development All XML/descriptor files are now optional Lightweight Profiles introduction Web / Full Pruning Not deprecated, but will be

4 Java EE 6 > Agile? Most application servers are agile themselves OW2 JOnAS for example Modularity in the core (OSGi TM ) Requirement driven assemblies Right sized assemblies Reduced size (download / in memory) On-demand services deployment Oriented towards a responsive environment for the developer

5 Web Profile > What's inside? Servlet 3.0 Java Server Pages (JSP) 2.2 Expression Language (EL) 2.2 Debugging Support for Other Languages (JSR-45) 1.0 Standard Tag Library for JavaServer Pages (JSTL) 1.2 JavaServer Faces (JSF) 2.0 Common Annotations for the Java Platform (JSR-250) 1.1 Enterprise JavaBeans (EJB) 3.1 Lite Java Transaction API (JTA) 1.1 Java Persistence API (JPA) 2.0 Bean Validation 1.0 Managed Beans 1.0 Interceptors 1.1 Contexts and Dependency Injection for the Java EE Platform 1.0 Dependency Injection for Java 1.0

6 Web Profile > What's inside? Servlet 3.0 Java Server Pages (JSP) 2.2 Expression Language (EL) 2.2 Debugging Support for Other Languages (JSR-45) 1.0 Standard Tag Library for JavaServer Pages (JSTL) 1.2 JavaServer Faces (JSF) 2.0 Common Annotations for the Java Platform (JSR-250) 1.1 Enterprise JavaBeans (EJB) 3.1 Lite Java Transaction API (JTA) 1.1 Java Persistence API (JPA) 2.0 Bean Validation 1.0 Managed Beans 1.0 Interceptors 1.1 Contexts and Dependency Injection for the Java EE Platform 1.0 Dependency Injection for Java 1.0

7 Web Profile > Servlet 3.0 Do not clutter your descriptors with frameworks' cruft META-INF/web-fragment.xml descriptor for web libraries API to add Servlets at startup Framework friendly! Easier maintenance @WebListener,...

8 Web Profile > EJB 3.1 lite EJBs in your web No interfaces required Portable global JNDI names Limitations No remote interfaces No Asynchronous methods No MDB No public class SingletonBean public void init() { // Called at application initialization public class HelloWorldBean public Future<String> hello(string name) { return new AsyncResult<String>("Hello " + name);

9 Web Profile > JPA 2.0 Collection of embeded objects support List / Map support Ordered lists Validation support Criteria API Build queries Type safe = = "value") private = "title") private List<Book> books; CriteriaBuilder builder = em.getcriteriabuilder(); CriteriaQuery<Customer> query = builder.createquery(customer.class); Root<Customer> customer = query.from(customer.class); query.select(customer).where(builder.equal(customer.get("firstname"), "John")); CriteriaBuilder builder = em.getcriteriabuilder(); CriteriaQuery<Customer> query = builder.createquery(customer.class); Root<Customer> customer = query.from(customer.class); query.select(customer).where(builder.equal(customer.get(customer_.firstname), "John"));

10 Web Profile > Bean Validation Applied accross a range of Java EE spec JSF, JPA, Servlet Validator may be injected Manual public class Order implements private private int public class ValidationBean private Validator validator; public void validate(order order) { Set<ConstraintViolation<Order>> violations = validator.validate(order); if (!violations.isempty()) { System.out.println(order + " is invalid:"); for (ConstraintViolation<Order> violation : violations) { System.out.println(violation.getMessage());

11 Web Profile > CDI 1.0 New programming model Features Dependency Disambiguate Context management Per request/session/application/conversation Eventing API Event producer/consumer decoupling Extensible

12 Web Profile > CDI 1.0 > Examples Injection public class LoggingBean { public class LogProducer private Logger logger; public void execute() { logger.fine("execute has been public Logger logger(injectionpoint point) { String name = point.getmember().getdeclaringclass().getname(); return LogManager.getLogManager().getLogger(name); Eventing public class EventingBean { public class EventObserverBean private Event<HelloEvent> eventing; public void sayhello() { eventing.fire(new HelloEvent("Guillaume")); public void onhelloevent(@observes HelloEvent event) { System.out.println("Hello " + event.getname());

13 Web Profile > Benefits Easy to step in Cross-cutting specifications Easy packaging Evolutivity Easy migration to EJB Standard injection Finally!

14 jonas.ow2.org

15 public class FragmentListener implements ServletContextListener { public void contextdestroyed(servletcontextevent event) { ServletContext context = event.getservletcontext(); String simpleservletname = "MyServletServlet"; Map<String, String> initparams = new HashMap<String, String>(); initparams.put("param1", "value1"); initparams.put("param2", "value2"); String[] urlpatterns = new String[]{"/simple"; Dynamic reg = context.addservlet(simpleservletname, "web.fragmentservlet"); reg.setinitparameters(initparams); reg.addmapping(urlpatterns); reg.setloadonstartup(-1); public void contextinitialized(servletcontextevent event) { Servlet 3.0 <web-fragment xmlns=" xmlns:xsi=" xsi:schemalocation=" version="3.0"> <display-name>web Fragment Library</display-name> <servlet> <servlet-name>fragmentservlet</servlet-name> <servlet-class>web.fragmentservlet </servlet-class> </servlet> <listener> <listener-class>web.fragmentlistener</listener-class> </listener> </web-fragment>