This document summarizes the new features of Java EE 7, including improvements to websockets, batch applications, concurrency utilities, JSON processing, JMS, JAX-RS, JPA, JSF and other specifications. It provides code examples for using websockets, CDI, bean validation, batch applications, JMS, JAX-RS and JPA in Java EE 7. It also outlines the Java EE 8 roadmap and how to get involved in the Java EE expert groups and specification projects.

1. Java EE 7, what’s in it
for me
Alex Soto - @alexsotob

2. Alex Soto!
@alexsotob - asotobu@gmail.com
Member of
Scytl Architect Software Engineer
lordofthejars.com
Apache Tomcat!
Apache TomEE

3. Questions?
Ask them right away!

5. New Specifications
• Websockets
• Batch Applications
• Concurrency Utilities
• JSON Processing

6. Improvements
• Simplified JMS API
• Default Resources
• JAX-RS Client API
• EJB’s External Transactions
• CDI Annotations
• Entity Graphs

7. Java EE 7 JSRs

8. Websockets
• Supports Client and Server
• Declarative and Programmatic

9. 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);}!
}

10. Websockets Chat Client
@ClientEndpoint!
public class ChatClientEndpoint {!
public static String TEXT = "Client1 joins";!
public static CountDownLatch latch;!
public static String response;!
!
@OnOpen!
public void onOpen(Session session) {!
session.getBasicRemote().sendText(TEXT);!
}!
!
@OnMessage!
public void processMessage(String message) {!
response = message;!
latch.countDown();!
}!
}

11. CDI
• Finer Scanning Control
• More Annotations

12. CDI
<beans!
xmlns="http://xmlns.jcp.org/xml/ns/javaee"!
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"!
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee !
http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"!
bean-discovery-mode="all">!
</beans>

13. CDI
@Vetoed,@Transactional, @TransactionScoped
@RequestScoped!
public class MyTransactionalTxTypeBean {!
@Transactional(Transactional.TxType.REQUIRED)!
public void required() {!
System.out.println(getClass().getName() + "Transactional.TxType.REQUIRED");!
}!
}

14. Bean Validation
• Design By Contract
• CDI integration

15. Bean Validation
@Future!
public Date showDate(boolean correct) {!
Calendar cal = Calendar.getInstance();!
cal.add(Calendar.DAY_OF_MONTH, correct ? 5 : -5);!
return cal.getTime();!
}!
!
public String showList(@NotNull @Size(min = 1, max = 3) List<String> list, @NotNull String prefix) {!
StringBuilder builder = new StringBuilder();!
!
for (String s : list) {!
builder.append(prefix).append(s).append(" ");!
}!
!
return builder.toString();!
}

16. Batch Applications
• For long, non-interactive processes
• Either sequential or parallel (partitions)
• Task or Chunk oriented processing

17. Batch Applications

18. 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>

19. Concurrency Utilities
• Asynchronous capabilities to the Java EE world
• Java SE Concurrency API extension (Executor
Service, Scheduled Executor, ThreadFactory)
• Safe and propagates context

20. 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!
}!
}!
}

21. JSON Processing
• Read, generate and transform JSON
• Streaming API and Object Model API

22. 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”} ]

23. JMS
• New interface JMSContext
• Modern API with Dependency Injection
• Resources AutoCloseable
• Simplified how to send messages
• Programmatic definition

24. 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);!
}!
}

25. 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);!
}

26. JMS
String body=null;!
try (JMSContext context = connectionFactory.createContext();){!
JMSConsumer consumer = session.createConsumer(queue);!
body = consumer.receiveBody(String.class);!
} catch (JMSRuntimeException ex) {!
// handle exception (details omitted)!
}!
return body;

27. JMS
!
@JMSDestinationDefinition(!
name = Resources.REQUEST_QUEUE,!
resourceAdapter = "jmsra",!
interfaceName = "javax.jms.Queue",!
destinationName = "requestQueue",!
description = "Queue for service requests")!
public class Resources {!
public static final String REQUEST_QUEUE = "java:global/jms/
requestQueue";!
}

28. JAX-RS
• New API to consume REST services
• Asynchronous processing (client and server)
• Filters and Interceptors

29. JAX-RS
String movie = ClientBuilder.newClient()!
.target("http://www.movies.com/movie")!
.request(MediaType.TEXT_PLAIN)!
.get(String.class);

30. JAX-RS
@GET!
public void getList(@Suspended final AsyncResponse ar) throws NamingException {!
ar.setTimeoutHandler(new TimeoutHandler() );!
!
ar.register(new MyCompletionCallback());!
ar.register(new MyConnectionCallback());!
!
Executors.newSingleThreadExecutor(threadFactory).submit(new Runnable() {!
!
@Override!
public void run() {!
Thread.sleep(3000);!
ar.resume(response[0]);!
}!
});!
}!

31. JAX-RS
Future<Response> r1 = ClientBuilder.newClient()!
.target("http://www.movies.com/movie")!
! ! ! ! ! ! ! ! .request().async().get();

32. JAX-RS
• ClientRequestFilter
• ClientResponseFilter
• ContainerRequestFilter
• ContainerResponseFilter
• ReaderInterceptor (Entity Interceptor)
• WriterInterceptor (Entity Interceptor)

33. JPA
• Schema generation
• Stored Procedures
• Entity Graphs
• Unsynchronized Persistence Context

34. 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>

35. 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);

36. JPA@Entity!
@NamedQueries({!
@NamedQuery(name = "Movie.findAll", query = "SELECT m FROM Movie m")!
})!
@NamedEntityGraphs({!
@NamedEntityGraph(!
name = "movieWithActors",!
attributeNodes = {!
@NamedAttributeNode("movieActors")!
}!
)!
public class Movie implements Serializable {!
!
@OneToMany!
@JoinColumn(name = "ID")!
private Set<MovieActor> movieActors;!
}

37. JPA
public List<Movie> listMovies(String hint, String graphName) {!
return entityManager.createNamedQuery("Movie.findAll")!
.setHint("javax.persistence.fetchgraph", entityManager.getEntityGraph(graphName))!
.getResultList();!
}

38. JSF
• HTML 5 support
• @FlowScoped and @ViewScoped
• File Upload component
• Flow Navigation by Convention
• Resource Library Contracts

39. Others
• Servlet: Non-blocking I/O, Security
• Default JMS Queue/Topic, DataSource, Concurrent
pool
• Mail Session definition: @MailSessionDefinition
• Interceptors: @Priority, @AroundConstruct
• EJB: Passivation opcional, EJB-Lite with
@Asynchronous and @Schedule
• EL: Lambdas, isolated API

40. Certified Servers
• Glassfish 4.0
• Wildfly 8.0.0
• TMAX JEUS 8
• Websphere Liberty Profile 9
• TomEE 7 on progress

41. Java EE 8
• Alignment with Java 8
• JCache
• JSON-B
• MVC
• HTTP 2.0 Support
• Cloud Support
• Security

42. How to get involved
• Join an expert group
• https://javaee-spec.java.net
• Adopt a JSR
• https://glassfish.java.net/adoptajsr/

43. 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

44. Thank you!