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EJB et WS (Montreal JUG - 12 mai 2011)
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EJB et WS (Montreal JUG - 12 mai 2011)


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  • 1. EJB and SOAP WS Par Romain Rocès pour le Montréal JUG
  • 2. About meRomain Rocès Teacher at Supinfo Montreal Blue belt on BlackBelt Factory Romain Rocès
  • 3. Concept
  • 4. ConceptEJB regroups several conceptsProvides different services (Session Bean),communicates with another application (Message Bean),saves information (Entity Bean). Just like a brain, EJB is the center of the application. It proposes many functions.
  • 5. Version 3 The previous version (2.1) was too complex The version 3.0 tends to simplification : Less steps, less classes, less configuration Improvements from Java EE 5 Annotations Generics Java Persistance API Concepts remain the same, but Sun integrated many ideas from popular open-source projects like Spring or Hibernate.
  • 6. Application servers WebLogic, by BEA Oracle Application Server, by Oracle JBoss, by RedHat GlassFish, by Sun MicroSystems
  • 7. EJB sessionSingleton, Stateless, Stateful
  • 8. Facade pattern The Session Bean acts as a “facade”. Its the clients interlocutor
  • 9. Client accessDifferent clients can call the Session Bean methods if theypossess its interface Desktop application Interface Implementation Session Bean deployed on a server Web application
  • 10. Session Bean Local Set @Local on the interface (not mandatory) Used when the client is deployed in the same virtual machine Example : A Web application deployed in the same server as the Session Bean Advantage : Resource-friendly More secure Disadvantage : Local scope
  • 11. Session Bean LocalLocal interfaces are not mandatory@Statelesspublic class HelloServiceBean { public String sayHello(){ return "Hello World"; }}
  • 12. Session Bean Remote Set @Remote on the interface Used when the client is located in a different virtual machine Example : A web application deployed in a different server than the Session Bean A rich-client Advantage : Open on the network Disadvantage : Consumes more resources (uses RMI) Security
  • 13. Session Bean RemoteInterface@Remotepublic interface HelloService {public String sayHello();}Implementation@Statelesspublic class HelloServiceBean implements HelloService{ public String sayHello(){ return "Hello World"; }}
  • 14. Stateless modeA Stateless Bean is not bound to any clientExemples : Retrieve a list of products HelloService getPlaces() getPlaces()Advantage : getTrips() Resource-friendly
  • 15. Stateless mode @Stateless public class HelloWorld { public String sayHelloTo(String name){ return "Hello " + name; } }
  • 16. Stateful modeA Statefull Bean is bound to a clientExemples : Cart OrderService getPlaces() getPlaces()Advantage : getTrips() Impact on server performance
  • 17. Stateful mode @Stateful public class OrderService { public void setName(String name){…}; public void setAddress(String address){…}; public void buyDog(){…}; … }
  • 18. Singleton modeOne Singleton Bean per JVMExemples : Counter CacheAdvantage : Resource-friendly One instanceDisadvantage : One instance
  • 19. Singleton mode @Singleton public class Counter { private int i = 0; public int getCount(){ return ++i; } }
  • 20. Asynchronous calls How to have asynchronous call in EJBs ? Threads dont integrate well @Asynchronous Method returns void or java.util.concurrent.Future<T>
  • 21. Asynchronous calls@Statelesspublic class HelloWorld { @EJB MailManager mailManager; public String sayHelloTo(String name){ mailManager.sendMail(); return "Hello " + name; }}@Statelesspublic class MailManager { @Asynchronous public void sendMail(){ ... }}
  • 22. Timer Service Programmatic and Calendar based scheduling « Last day of the month » « Every five minutes on Monday and Friday » Cron-like syntax second [0..59], minute[0..59], hour[0..23], year DayOfMonth[1..31] dayOfWeek[0..7] or [sun, mon, tue..] Month[0..12] or [jan,feb..]
  • 23. Timer Service@Statelesspublic class WakeUpBean { @Schedule(dayOfWeek=“Mon-Fri”, hour=“9”) void wakeUp() { ... }}
  • 24. Unit Test
  • 25. JUnit Not in EJB context@Test public void myTest(){ StatelessBean statelessBean = new StatelessBean(); statelessBean.getCounter(); }
  • 26. JUnit With EJB context : embedded glassfish@Testpublic void myTest() throws NamingException{ EJBContainer createEJBContainer = EJBContainer.createEJBContainer(); StatelessBean statelessBean = (StatelessBean)container.getContext() .lookup("java:global/classes/StatelessBean"); statelessBean.getCounter(); container.close();}
  • 27. Unit Test Cactus is a simple test framework for unit testing server-side java code (Servlets, EJBs, Tag Libs, Filters, ...). The Ejb3Unit project automates Entity and Session bean testing outside the container for the EJB 3.0 specification.
  • 28. Client connection lookup & @EJB
  • 29. EJB connection with lookup The client needs the JNDI context to connect to the server. The client also needs the Session Bean interface Retrieve the Session Bean with a lookup() Then its possible to call methods from the Bean Context context = new InitialContext(); HelloService hello = (HelloService) context.lookup(HelloService.class.getName()); System.out.println(hello.sayHello()); The Session Bean will send you a message !
  • 30. EJB connection with file exampleGlassFish Parametersjava.naming.factory.initial=org.jnp.interfaces.NamingContextFactoryjava.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfacesjava.naming.provider.url =
  • 31. EJB injection In the same JVM, its not necessary to do a lookup() Obtain a Session Bean with resource injection Used in other EJBs, web applicationspublic class ClientServiceBean implements ClientService { @EJB private OrderService orderService; ...}
  • 32. Soap WS in EJB module Add @WebService and @Stateless annotation on a class It run !@WebService@Statelesspublic class MyBeanPublic { @WebMethod public String helloWorld() { return null; }}Default WSDL address : http://localhost:8080/MyBeanPublicService/MyBeanPublic?wsdl
  • 33. Soap WS in EJB moduleNow, we use our EJB @stateless in our SOAP WS.@WebService@Statelesspublic class MyBeanPublic { @EJB private MyBeanLocal ejbRef; @WebMethod public String helloWorld() { return ejbRef.helloWorld(); }}
  • 34. Soap WS in EJB moduleExemple with NetBeans 7
  • 35. EJB entity
  • 36. Persistence UnitThe persistence unit makes the link between your applicationand a DataSource
  • 37. Persistence UnitDifferent providers Hibernate (use by default in JBoss) TopLink (use by default in Glassfish v2) EclipseLink (use by default in Glassfish v3)
  • 38. Persistence Unitpersistence.xml<?xml version="1.0" encoding="UTF-8"?><persistence version="2.0" ...> <persistence-unit name="montrealjugPU" transaction-type="JTA"> <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> <jta-data-source>jdbc/firone</jta-data-source> <exclude-unlisted-classes>false</exclude-unlisted-classes> <properties> <property name="eclipselink.ddl-generation" value="create-tables"/> </properties> </persistence-unit></persistence>
  • 39. Persistence Unitglassfish-resources.xml<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE resources PUBLIC "-// GlassFish Application Server 3.1Resource Definitions//EN" ""><resources> <jdbc-connection-pool ...> <property name="serverName" value="localhost"/> <property name="portNumber" value="1527"/> <property name="databaseName" value="firone"/> <property name="User" value="firone"/> <property name="Password" value="firone"/> <property name="URL" value="jdbc:derby://localhost:1527/firone"/> <property name="driverClass" value="org.apache.derby.jdbc.ClientDriver"/> </jdbc-connection-pool> <jdbc-resource enabled="true" jndi-name="jdbc/firone" object-type="user" pool-name="derby_net_firone_fironePool"/></resources>
  • 40. EntityManager in EJB Obtain an EntityManager with injection@Statelesspublic class DAO { @PersistenceContext(unitName="montrealjugPU") protected EntityManager em; public void createCat(Cat cat){ em.persist(cat); }}
  • 41. EJB messageJava Message Service
  • 42. JMS presentation The same since 2002 Used when some information should be exchanged between Two applications : point-to-point model Several applications : publish and subscribe model Asynchronous system : messages are received when the client request them Similar to a mail system
  • 43. Queue mode
  • 44. Topic mode
  • 45. Messages There are three different types of messages TextMessage to send simple text ObjectMessage for a serialized object MapMessage contains a map with strings as keys and objects as values
  • 46. Send a message In order to send a message, we have to: Reclaim required objects via JNDI A ConnectionFactory (service provider) A Destination (Queue or Topic) Create a Connection using the factory Open a Session using the connection Create a MessageProducer Send the message
  • 47. Send a messageContext ctx = new InitialContext();ConnectionFactory connectionFactory = (ConnectionFactory) ctx .lookup("ConnectionFactory");Destination destination = (Destination) ctx.lookup("queue/StockValue");Connection cnx = connectionFactory.createConnection();Session session = cnx.createSession(false, Session.AUTO_ACKNOWLEDGE);MessageProducer producer = session.createProducer(destination);TextMessage message = session.createTextMessage();message.setText("Yourmicrosoft stock has been sold !");producer.send(message);cnx.close();
  • 48. Receive a message Two ways to receive a message Blocking, waiting for a message Non-blocking, using a message listener A message listener is similar to an event listener : it "subscribes" to a particular destination and receives messages each time theres a new one
  • 49. Receive a messageBlocking modeMessageConsumer consumer = session.createConsumer(destination);// Retrieve a single messageMessage receivedMessage = consumer.receive();Non-blocking mode, using a listenerMessageConsumer consumer = session.createConsumer(destination);// Set the listenerconsumer.setMessageListener(new MessageListener() { public void onMessage(Message message) { // Will be called each time a message is received}});
  • 50. Receive a message : Message Driven Bean A Message Driven Bean is a specific component for receiving messages Annotation used is @MessageDriven Destination name and type are declared in the annotation Implements javax.jms.MessageListener Method public void onMessage(Message m) Called at the moment of receipt
  • 51. Receive a message : Message Driven Bean@MessageDriven( mappedName="queue/StockValue", activationConfig = {@ActivationConfigProperty( propertyName = "destinationType", propertyValue = "javax.jms.Queue")})class MyDrivenBean implements MessageListener {public void onMessage(Message message) {TextMessage textMessage = (TextMessage) message;System.out.println(textMessage.getText());}}
  • 52. Merci de votre attention
  • 53. SourcesSupinfo : www.supinfo.comParisJUG :
  • 54. License