Java EE 6 Community Roundtable. Reza Rahman Independent Consultant Author, EJB 3 in Action

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Bryan Cross
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1 Java EE 6 Community Roundtable Reza Rahman Independent Consultant Author, EJB 3 in Action reza@rahmannet.net

2 Java EE 6: Expanding Horizons Java EE 5 Ease-of-use, annotations, freedom from XML, new APIs EJB 3.0, JPA 1.0, JSF 1.0, JAX-WS 2.0 Demise of EJB 2.x Entity Beans Java EE 6 Pruning: A healthful maturity Profiles: Different strokes for different folks Innovation: New APIs, new features, further ease-of-use JCDI, JSF 2.0, EJB 3.1, JPA 2.0, Servlet 3.0, JAX-RS 1.1

3 Pruning An important first step in the life-cycle of a mature platform The goal is to deprecate APIs that are out-of-date or have been superseded Candidates for pruning: JAX-RPC: Superseded by the popular JAX-WS API EJB 2.x Entity Beans CMP: Dropped in favor of JPA JAXR: UDDI not well used Java EE Application Deployment (JSR-88): Poor support Java EE Management (JSR-77): Poor support

4 Profiles Specific sub-sets of Java EE APIs intended for specific environments Each Profile is fully integrated and just works out-of-the-box, although integrating add-ons is still possible Makes creating modular, lightweight Java EE compliant application servers a lot easier Makes it possible to extend the platform by integrating nonstandard APIs without serious loss of compatibility/fragmentation Only one Profile, the Web Profile is initially planned

5 Suggested Profiles API Servlet 3.0 JSP 2.2 JSTL 1.2 EL 1.2 JSF 2.0 JCDI (?) EJB 3.1 JPA 2.0 JTA 1.1 JMS 1.1 JavaMail 1.4 JAX-WS 2.2 JAX-RS 1.1 JAXB 2.2 JACC 1.0 JCA 1.6 Web Profile Full Profile

6 Major API Changes in Java EE 6 Java Contexts and Dependency Injection JSF/EJB 3/JPA integration Generic dependency injection Java Server Faces (JSF) 2.0 Ease-of-use, technology adoption, new features Enterprise Java Beans (EJB) 3.1 Ease-of-use, new features Java Persistence API (JPA) 2.0 New features Servlet 3.0 Ease-of-use, new features Java API for RESTful Web Services (JAX-RS) 1.1 API for developing REST based web services

7 Java Contexts and Dependency Injection Unifies the JSF, JPA and EJB 3 programming models Stateful, contextual web development Conversations Type-safe generic dependency injection Enhancements to the Interceptor model, decorators Annotations meta-programming

8 JSF Page Using JCDI <h:form> <table> <tr> <td>bidder</td> <td><h:inputtext value="#{bid.bidder"/></td> </tr> <tr> <td>item</td> <td><h:inputtext value="#{bid.item"/></td> </tr> <tr> <td>bid Amount</td> <td><h:inputtext value="#{bid.bidprice"/></td> </tr> </table>... <h:commandbutton type="submit" value="add Bid" action="#{placebid.addbid"/>... </h:form>

9 JPA Entity @Table(name= BIDS ) public class @Column(name= BID_ID ) public Long bidid; public String bidder; public String BID_PRICE ) public Double bidprice;

10 EJB 3.1 Session Bean @Named( placebid ) public class PlaceBidBean private EntityManager private Bid private MathUtil public void addbid() { bid.setbidprice(mathutil.round( bid.getbidprice(), 2)); entitymanager.persist(bid);

11 Java Bean METHOD, FIELD, Utility public class MathUtil {... public double round(double value, int decimalplaces) { BigDecimal converter = new BigDecimal(Double.toString(value)); converter = converter.setscale(decimalplaces, BigDecimal.ROUND_HALF_UP); return converter.doublevalue();...

12 public class AuditInterceptor public Object audit(invocationcontext context) throws Exception { System.out.println("Entering: " + context.getmethod().getname()); System.out.println(" with args: " + context.getparameters()); return context.proceed();

13 Java Server Faces 2.0 First-class support for Facelets as view/custom components in addition to JSP Annotation-driven configuration Ajax support in the JSF life-cycle Resources New JSF standard components Many others

14 Facelet Component in Use <html xmlns=" xmlns:h=" xmlns:f=" xmlns:ez=" <h:head> <title>a simple example of EZComp</title> </h:head> <h:body> <h:form> <ez:loginpanel id="loginpanel"> <f:actionlistener for="loginevent" binding="#{bean.logineventlistener" /> </ez:loginpanel> </h:form> </h:body> </html>

15 Facelet Component <html xmlns=" xmlns:h=" xmlns:f=" xmlns:ui=" xmlns:composite=" <body> <composite:interface> <composite:actionsource name="loginevent" /> </composite:interface> <composite:implementation> <p>username: <h:inputtext id="usernameinput" /></p> <p>password: <h:inputsecret id="passwordinput" /></p> <p><h:commandbutton id="loginevent" value="login"/> </composite:implementation> </body> </html>

16 JSF accountcreator", scope="request") public class AccountCreatorBean private User user;... public String createaccount() {...

17 Enterprise Java Beans 3.1 Session Bean optional interfaces Singleton Beans with concurrency control Cron-style declarative and programmatic Timers Asynchronous bean invocation Simplified WAR packaging Java SE support Standardized Global JNDI naming EJB Lite

18 Cron-like Declarative public class NewsLetterGeneratorBean private Session minute="0", hour="0", dayofmonth="1", month="*", year="*") public void generatemonthlynewsletter() {...

19 Asynchronous Session public class OrderBillingBean public Future<BillingStatus> billorder(order order) { try { bill(order); return new AsyncResult<BillingStatus>( BillingStatus.COMPLETE); catch (BillingException be) { return new AsyncResult<BilllingStatus>( BillingStatus.BILLING_FAILED);...

20 Java Persistence API 2.0 Object-relational mapping enhancements Collections, maps and ordered lists Unidirectional one-to-many mapping Join tables for one-to-one, many-to-one Query and EntityManager API enhancements First result, max result, unwrapping JPQL enhancements CASE, NULLIF, COALESCE Criteria API Second-level caching Many, many more

21 USERS ) public class @Column(name= USER_ID ) public long userid; public String BIRTH_DATE ) public ALIASES ALIAS ) public Set<String> public Map<String, String> photos;

22 Unidirectional One-to-Many public class public long id; public USER_ID ) public Set<Phone> public class public long id; public String type; public String number;...

23 Criteria API QueryDefinition querydefinition = entitymanager.getquerybuilder().createquerydefinition(); DomainObject user = querydefinition.addroot(user.class); user.select(user).where(user.get( firstname").equal( John ).and(user.get("lastname").equal("smith"))); SELECT user FROM User user WHERE user.firstname = John AND user.lastname = Smith

24 Servlet 3.0 Annotations from the ground-up Optional web.xml Intelligent defaults Modular web.xml fragments in framework library jars Programmatic addition of Servlets, Filters and Listeners through the ServletContext Asynchronous processing support in Servlets

25 Servlet Annotations PlaceBidServlet urlpatterns={ /bid, /place-bid ) public class PlaceBidServlet extends HttpServlet private PlaceBid placebid; public void doget(httpservletrequest request, HttpServletResponse response) { Bid bid = new Bid();... placebid.placebid(bid);...

26 Programmatic Servlet public class ActionBazaarListener implements ServletContextListener { public void contextinitialized( ServletContextEvent event) { ServletContext context = event.getservletcontext(); context.addservlet( PlaceBidServlet", Place bid servlet", actionbazaar.placebidservlet", null, -1); context.addservletmapping( PlaceBidServlet", new String[]{"/place-bid");

27 Java API for RESTful Web Services Web services through REST instead of SOAP REST counterpart of JAX-WS Gets rid of low-level code so you can focus on core logic Annotations from the ground-up Integrated with WebBeans, EJB and JPA

28 Session Bean public class PlaceBidBean private public void bidder") String item") String bid_price") Double bidprice) { entitymanager.persist( new Bid(bidder, item, bidprice));

29 Summary Pruning Chopping dead wood JAX-RPC, EJB 2.x Entity Beans, JAXR, JSR-88, JSR-77 Profiles Web profile geared towards majority of Java EE applications Lightweight, modular application servers Easier to integrate non-standard solutions Innovation JCDI, JSF 2.0, EJB 3.1, JPA 2.0, Servlet 3.0, JAX-RS 1.1 Your help is needed Send comments to

30 References Java EE 6, WebBeans, JSF 2.0, EJB 3.1, JPA 2.0, Servlet 3.0, JAX-RS 1.1,

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