1. 2º Encontro
13/02/2014
Departamento de Engenharia Informática - Faculdade de Ciências e Tecnologia
Universidade de Coimbra

2. Objectivos
•
Promover a comunidade de Java na zona Centro
através de eventos periódicos
•
Encorajar a participação de membros
•
Aprender e divertir-se

3. Contactos
•
Meetup - http://www.meetup.com/Coimbra-JUG/
•
Mailing List - coimbra-jug-list@meetup.com
•
Youtube - http://www.youtube.com/user/coimbrajug

4. O primeiro contacto
com Java EE 7

5. Roberto Cortez
Freelancer
twitter:!
@radcortez!
!
mail:!
radcortez@yahoo.com!
!
blog:!
http://www.radcortez.com

6. Questões?
Assim que tiverem!

8. Novas Especificações
•
Websockets
•
Batch Applications
•
Concurrency Utilities
•
JSON Processing

9. Melhorias
•
Simplificação API JMS
•
Default Resources
•
JAX-RS Client API
•
Transacções externas a EJB’s
•
Mais Anotações
•
Entity Graphs

10. Java EE 7 JSRs

11. Websockets
•
Suporta cliente e servidor
•
Declarativo e Programático

12. 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);}!
}

13. Batch Applications
•
Ideal para processos massivos, longos e nãointeractivos
•
Execução sequencial ou paralela
•
Processamento orientado à tarefa ou em secções.

14. Batch Applications

15. 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>

16. Concurrency Utilities
•
Capacidades assíncronas para componentes Java
EE
•
Extensão da API de Java SE Concurrency
•
API segura e propaga contexto.

17. 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!
}!
}!
}

18. JSON Processing
•
API para ler, gerar e transformar JSON
•
Streaming API e Object Model API

19. 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”} ]

20. JMS
•
Nova interface JMSContext
•
Modernização da API utilizando DI
•
AutoCloseable dos recursos
•
Simplificação no envio de mensagens

21. 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);!
}!
}

22. 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);!
}

23. JAX-RS
•
Nova API para consumir serviços REST
•
Processamento assíncrono (cliente e servidor)
•
Filtros e Interceptors

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

25. JPA
•
Geração do schema da BD
•
Stored Procedures
•
Entity Graphs
•
Unsynchronized Persistence Context

26. JPA
<persistence-unit name="myPU" transaction-type="JTA">!
<properties>!
<property name="javax.persistence.schemageneration.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-scriptsource" value="META-INF/create.sql"/>!
<property name="javax.persistence.schema-generation.drop-scriptsource" value="META-INF/drop.sql"/>!
<property name="javax.persistence.sql-load-script-source"
value="META-INF/load.sql"/>!
</properties>!
</persistence-unit>

27. 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);

28. JSF
•
Suporte HTML 5
•
@FlowScoped e @ViewScoped
•
Componente para File Upload
•
Navegação de flow por convenção
•
Resource Library Contracts

29. Outros
•
JTA: @Transactional, @TransactionScoped
•
Servlet: Non-blocking I/O, Segurança
•
CDI: Automáticos para EJB’s e beans anotados (beans.xml
opcional), @Vetoed
•
Interceptors: @Priority, @AroundConstruct
•
EJB: Passivation opcional
•
EL: Lambdas, API isolada
•
Bean Validator: Restrições nos parâmetros dos métodos e retornos

30. Servidores Certificados
•
Glassfish 4.0
•
Wildfly 8.0.0
•
TMAX JEUS 8

31. Futuro Java EE 8
•
JCache
•
Logging
•
JSON-B
•
Security
•
Testability
•
Cloud?
•
Modularity?
•
NoSQL?

32. Materiais
•
Tutorial Java EE 7 - http://docs.oracle.com/javaee/
7/tutorial/doc/home.htm
•
Exemplos Java EE 7 - https://github.com/javaeesamples/javaee7-samples

33. Obrigado!