The First Contact with Java EE 7
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The document outlines the key features and specifications of Java EE 7, including support for WebSockets, batch applications, concurrency utilities, JSON processing improvements, JMS API enhancements, and the JAX-RS client API. It provides code examples for each new feature, demonstrating their usage and integration within Java EE applications. Additionally, it mentions future developments in Java EE 8 and provides resources for further learning and implementation.
![JSON Processing
JsonArray jsonArray = Json.createArrayBuilder()
.add(Json.createObjectBuilder()
.add("name", “Jack"))
.add("age", "30"))
.add(Json.createObjectBuilder()
.add("name", “Mary"))
.add("age", "45"))
.build();
[ {“name”:”Jack”, “age”:”30”},
{“name”:”Mary”, “age”:”45”} ]](https://image.slidesharecdn.com/the-first-contact-with-java-ee-7-160203130432/85/The-First-Contact-with-Java-EE-7-15-320.jpg)
The First Contact with Java EE 7
- 1. The First Contact with Java EE 7
- 2. Questions? Ask them right away!
- 4. New Specifications • Websockets • Batch Applications • Concurrency Utilities • JSON Processing
- 5. Improvements • Simplified JMS API • Default Resources • JAX-RS Client API • EJB’s External Transactions • More Annotations • Entity Graphs
- 6. Java EE 7 JSRs
- 7. Websockets • Supports Client and Server • Declarative and Programmatic
- 8. Websockets Chat Server @ServerEndpoint("/chatWebSocket") public class ChatWebSocket { private static final Set<Session> sessions = Collections.synchronizedSet(new HashSet<Session>()); @OnOpen public void onOpen(Session session) {sessions.add(session);} @OnMessage public void onMessage(String message) { for (Session session : sessions) { session.getAsyncRemote().sendText(message);} } @OnClose public void onClose(Session session) {sessions.remove(session);} }
- 9. Batch Applications • For long, non-interactive processes • Either sequential or parallel (partitions) • Task or Chunk oriented processing
- 11. Batch Applications - job.xml <job id="myJob" xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="1.0"> <step id="myStep" > <chunk item-count="3"> <reader ref="myItemReader"/> <processor ref="myItemProcessor"/> <writer ref="myItemWriter"/> </chunk> </step> </job>
- 12. Concurrency Utilities • Asynchronous capabilities to the Java EE world • Java SE Concurrency API extension • Safe and propagates context
- 13. Concurrency Utilities public class TestServlet extends HttpServlet { @Resource(name = "concurrent/MyExecutorService") ManagedExecutorService executor; Future future = executor.submit(new MyTask()); class MyTask implements Runnable { public void run() { // do something } } }
- 14. JSON Processing • Read, generate and transform JSON • Streaming API and Object Model API
- 15. JSON Processing JsonArray jsonArray = Json.createArrayBuilder() .add(Json.createObjectBuilder() .add("name", “Jack")) .add("age", "30")) .add(Json.createObjectBuilder() .add("name", “Mary")) .add("age", "45")) .build(); [ {“name”:”Jack”, “age”:”30”}, {“name”:”Mary”, “age”:”45”} ]
- 16. JMS • New interface JMSContext • Modern API with Dependency Injection • Resources AutoCloseable • Simplified how to send messages
- 17. JMS @Resource(lookup = "java:global/jms/demoConnectionFactory") ConnectionFactory connectionFactory; @Resource(lookup = "java:global/jms/demoQueue") Queue demoQueue; public void sendMessage(String payload) { try { Connection connection = connectionFactory.createConnection(); try { Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); MessageProducer messageProducer = session.createProducer(demoQueue); TextMessage textMessage = session.createTextMessage(payload); messageProducer.send(textMessage); } finally { connection.close(); } } catch (JMSException ex) { Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex); } }
- 18. JMS @Inject private JMSContext context; @Resource(mappedName = "jms/inboundQueue") private Queue inboundQueue; public void sendMessage (String payload) { context.createProducer() .setPriority(1) .setTimeToLive(1000) .setDeliveryMode(NON_PERSISTENT) .send(inboundQueue, payload); }
- 19. JAX-RS • New API to consume REST services • Asynchronous processing (client and server) • Filters and Interceptors
- 20. JAX-RS String movie = ClientBuilder.newClient() .target("http://www.movies.com/movie") .request(MediaType.TEXT_PLAIN) .get(String.class);
- 21. JPA • Schema generation • Stored Procedures • Entity Graphs • Unsynchronized Persistence Context
- 22. JPA <persistence-unit name="myPU" transaction-type="JTA"> <properties> <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/> <property name="javax.persistence.schema-generation.create-source" value="script"/> <property name="javax.persistence.schema-generation.drop-source" value="script"/> <property name="javax.persistence.schema-generation.create-script-source" value="META-INF/ create.sql"/> <property name="javax.persistence.schema-generation.drop-script-source" value="META-INF/ drop.sql"/> <property name="javax.persistence.sql-load-script-source" value="META-INF/load.sql"/> </properties> </persistence-unit>
- 23. JPA @Entity @NamedStoredProcedureQuery(name="top10MoviesProcedure", procedureName = "top10Movies") public class Movie {} StoredProcedureQuery query = entityManager.createNamedStoredProcedureQuery( "top10MoviesProcedure"); query.registerStoredProcedureParameter(1, String.class, ParameterMode.INOUT); query.setParameter(1, "top10"); query.registerStoredProcedureParameter(2, Integer.class, ParameterMode.IN); query.setParameter(2, 100); query.execute(); query.getOutputParameterValue(1);
- 24. JSF • HTML 5 support • @FlowScoped and @ViewScoped • File Upload component • Flow Navigation by Convention • Resource Library Contracts
- 25. Others • JTA: @Transactional, @TransactionScoped • Servlet: Non-blocking I/O, Security • CDI: Automatic for EJB’s and annotated beans (beans.xml opcional), @Vetoed • Interceptors: @Priority, @AroundConstruct • EJB: Passivation opcional • EL: Lambdas, isolated API • Bean Validator: Restrictions in parameters and return types
- 26. Certified Servers • Glassfish 4.0 • Wildfly 8.0.0 • TMAX JEUS 8
- 27. Java EE 8 • Alignment with Java 8 • JCache • JSON-B • MVC • HTTP 2.0 Support • Cloud Support
- 28. Materials • Tutorial Java EE 7 - http://docs.oracle.com/javaee/7/ tutorial/doc/home.htm • Samples Java EE 7 - https://github.com/javaee- samples/javaee7-samples • Batch Sample - WoW Auctions - https://github.com/ radcortez/wow-auctions • WebSocket Sample - Chat Server - https:// github.com/radcortez/cbrjug-websockets-chat
- 29. Thank you!