7. Hamed Hatami @ 2014
Java EE 7 - JSRs
Connector
1.6
Connector
1.6
Managed Beans 1.0Managed Beans 1.0 EJB 3.2EJB 3.2
Servlet 3.1Servlet 3.1
Portable
Extension
s
Portable
Extension
s
JSF 2.2JSF 2.2 JAX-RS
2.0
JAX-RS
2.0
JMS 2.0JMS 2.0JPA 2.1JPA 2.1
EL 3.0EL 3.0
JTA 1.2JTA 1.2
JSP 2.2JSP 2.2
Interceptors 1.1Interceptors 1.1 CDI 1.1CDI 1.1
Common
Annotations 1.1
Common
Annotations 1.1
Concurrency Utilities
(JSR 236)
Concurrency Utilities
(JSR 236)
Batch Applications
(JSR 352)
Batch Applications
(JSR 352)
Java API for JSON
(JSR 353)
Java API for JSON
(JSR 353)
Java API for WebSocket
(JSR 356)
Java API for WebSocket
(JSR 356)
Updated
Major
Release
New
8. Hamed Hatami @ 2014
Java EE Web Profile Enhancements
• The Java Enterprise Edition Web Profile was introduced in Java EE 6
• Most Web applications have significant requirements in the areas of
transaction management, security, and persistence.
• but are not supported by standalone servlet containers.
• Web Profile is provided with pre-installed, pre-integrated, fully tested
Web infrastructure features.
• The Java EE 7 Web Profile adds support for HTML5 with WebSockets,
JSON, JAX-RS 2.0, and more.
9. Hamed Hatami @ 2014
JSR 343: Java Message Service 2.0
• API modernization using dependency injection
• Delivery delay, async send, MDB alignment, JMS resource definition
• Fixes, clarifications
12. Hamed Hatami @ 2014
JMS 2/Java EE 7
@JMSConnectionFactoryDefinition(
name="java:global/jms/demoConnectionFactory",
className= "javax.jms.ConnectionFactory",
description="ConnectionFactory to use in demonstration")
@JMSDestinationDefinition(
name = "java:global/jms/demoQueue",
description = "Queue to use in demonstration",
className = "javax.jms.Queue",
destinationName="demoQueue")
19. Hamed Hatami @ 2014
WebSocket to rescue
• TCP based, bi-directional, full-duplex messaging
• Capable of sending both UTF-8 string and binary frames in any
direction at the same time
• Operating from a single socket across the web
• As part of HTML5, the application of the client interface will become
native to all modern browsers
• To establish a Web Socket connection, the browser or client simply
makes a request to the server for an upgrade from HTTP to a Web
Socket
20. Hamed Hatami @ 2014
Java API for WebSocket
@ServerEndpoint(”/chat”)
public class ChatServer {
Set<Session> peers = ...
@OnOpen
public void onOpen(Session peer) {
peers.add(peer);
}
@OnClose
public void onClose(Session peer) {
peers.remove(peer);
}
...
21. Hamed Hatami @ 2014
Java API for WebSocket
@OnMessage
public void message(String message, Session client)
throws IOException {
for (Session session : peers) {
if (!session.equals(client)) {
session.getRemote().sendObject(message);
}
}
}
}
22. Hamed Hatami @ 2014
JSON (JavaScript Object Notation)
•JSON is a lightweight data-interchange format. It is easy for humans to read and write.
• It is easy for machines to parse and generate.
• It is based on a subset of the JavaScript Programming Language, Standard ECMA-262
3rd Edition - December 1999.
• JSON is a text format that is completely language independent but uses conventions
that are familiar to programmers.
23. Hamed Hatami @ 2014
Why we need another API?
• JSON has become a defacto data transfer standard specially for RESTful Web
Services.
• Java applications use different implementations to consume and process JSON data.
• There should be standardized Java API for JSON so that applications do not need to
bundle the implementation libraries.
• API to parse, generate, transform, query JSON
• Binding JSON to Java objects forthcoming.
25. Hamed Hatami @ 2014
JSR 338: Java API for RESTful Web Services 2.0
• Client API
• Message Filters & Entity Interceptors
• Asynchronous Processing – Server & Client
• Hypermedia Support
• Content negotiation
26. Hamed Hatami @ 2014
JAX-RS 2
// Get instance of Client
Client client = ClientBuilder.newClient();
// Get customer name for the shipped products
String name = client.target(“../orders/{orderId}/customer”)
.pathParam(”orderId", ”10”)
.queryParam(”shipped", ”true”)
.request()
.get(String.class);
27. Hamed Hatami @ 2014
JAX-RS 2 / Logging Filter
public class RequestLoggingFilter implements ContainerRequestFilter
{
@Override
public void filter(ContainerRequestContext requestContext) {
log(requestContext);
// Non-wrapping => returns without invoking next filter
}
...
}
28. Hamed Hatami @ 2014
JSR 339: Java Persistence API 2.1
The new features can be described with the following short list:
• Automatic schema generation
• Stored procedure mapping
• Unsynchronized persistence context
• Criteria Bulk updates and deletes
• JOIN using the ON condition
• Support for downcast in JPQL
• Support for Functions in JPQL
• CDI listeners in Entity classes
• Dynamically defined named queries
30. Hamed Hatami @ 2014
JPA 2.1 / Stored Procedures
Now there's a portable way to achieve it using:
StoredProcedureQuery spq = em.createStoredProcedureQuery("PERSON_SP");
If we have any parameters in this stored procedure we need to register them, for example:
spq.registerStoredProcedureParameter(1, String.class, ParameterMode.INOUT);
spq.setParameter(1, "FRANK");
spq.registerStoredProcedureParameter(2, Integer.class, ParameterMode.IN);
spq.setParameter(2, 100);
You can define it as well using the @NamedStoredProcedureQuery:
@Entity
@NamedStoredProcedureQuery(name="PERSON_StoredProcedure", procedureName="PERSON_SP")
public class Product {
…
}
and in your JPA client:
StoredProcedreQuery spq = EntityManager.createNamedStoredProcedureQuery("PERSON_StoredProcedure");
spq.registerStoredProcedureParameter(1, String.class, ParameterMode.INOUT);
spq.setParameter(1, "FRANK");
spq.registerStoredProcedureParameter(2, Integer.class, ParameterMode.IN);
spq.setParameter(2, 100);
query.execute();
String response = query.getOutputParameterValue(1);
31. Hamed Hatami @ 2014
JPA 2.1 / Unsynchronized Persistence Context
@Stateful
public class ShoppingCart {
@PersistenceContext(type=EXTENDED,synchronization=UNSYNCHRONIZED)
Private EntityManager em;
Private Customer customer;
Private Order order;
public void startToShop(Integer custId) {
customer = em.find(Customer.class,custId);
order = new Order();
}
public void addToCart(Book book) {
Item item = new Item(book);
order.addItem(item);
}
public void confirmOrder() {
em.joinTransaction();
customer.addOrder(order);
}
}
32. Hamed Hatami @ 2014
JPA 2.1
JOIN using the ON condition
SELECT e FROM Employee e LEFT JOIN e.address ON a.city = :city
Support for downcast in
JPQL SELECT b.name FROM User e JOIN TREAT(e.projects AS LargeProject) b
Support for Functions in JPQL
SELECT FUNCTION('YEAR', e.startDate) AS year, COUNT(e) FROM Employee e GROUP BY year
Criteria Bulk updates and deletes:
CDI listeners in Entity classes
CriteriaUpdate<Employee> q = cb.createCriteriaUpdate(Employee.class);
Root<Employee> c = q.from(Employee.class);
q.set(c.get(Employee.wage), 2000).where(c.it(c.get(Employee.wage), 2000));
@Entity
@EntityListeners(Alarm.class)
public class Customer {
@Id private Integer id;
private String name;
…
}
public class Alarm {
@PostPersist
public void alert(Customer c) {
…
}
}
33. Hamed Hatami @ 2014
JPA 2.1
Dynamically defined named queries
@PersistenceContext
Private EntityManager em;
private EntityManagerFactory emf = em.getEntityManagerFactory();
emf.addNamedQuery("supplierStatus",
em.createQuery("SELECT e.name FROM Employee e WHERE e.status = :status")
);
39. Hamed Hatami @ 2014
JSF 2.2 / File Upload Component
<h:inputFile id="file“ value="#{fileUploadBean.uploadedFile}">
<f:validator validatorId="FileValidator" />
</h:inputFile>
@Named @RequestScoped
public class FileUploadBean {
private Part uploadedFile; // getter/setter
public String getFileText() {
String text = "";
if (null != uploadedFile) { try {
InputStream is = uploadedFile.getInputStream();
text = new Scanner( is ).useDelimiter("A").next();
} catch (IOException ex) {} }
return text;
}
}
40. Hamed Hatami @ 2014
JSR 352: Batch Applications for the Java Platform 1.0
• Batch processing is execution of series of "jobs" that is suitable for
non-interactive, bulk-oriented and long-running tasks.
• no standard Java programming model existed for batch applications.
• API for robust batch processing targeted to Java EE, Java SE
41. Hamed Hatami @ 2014
Batch Applications for the Java Platform / Step Example
<step id=”sendStatements”>
<chunk reader=”accountReader”
processor=”accountProcessor”
writer=”emailWriter”
item-count=”10” />
</step>
@Named(“accountReader")
...implements ItemReader... {
public Account readItem() {
// read account using JPA
@Named(“accountProcessor")
...implements ItemProcessor... {
Public Statement processItems(Account account) {
// read Account, return Statement
@Named(“emailWriter")
...implements ItemWriter... {
public void writeItems(List<Statements>
statements) {
// use JavaMail to send email
44. Hamed Hatami @ 2014
JSR 236: Concurrency Utilities for Java EE 1.0
• Provides simple, safe API for concurrency in Java EE
• Builds on Java SE concurrency
- java.util.concurrent.ExecutorService
• Relatively low-level API
• Important enabler for Java EE ecosystem
• Managing your own threads within a Java EE container is not recommended
• Using java.util.concurrent API in a Java EE application component such as EJB
or Servlet are problematic since the container and server have no knowledge of
these resource
45. Hamed Hatami @ 2014
Concurrency Utilities for Java EE
Managed Task Executor
public class TestServlet extends HTTPServlet {
@Resource(name=“concurrent/MyExecutorService”)
private ManagedExecutorService executor;
Future future = executor.submit(new MyTask());
class MyTask implements Runnable {
public void run() {
... // Task logic
}
}
}
46. Hamed Hatami @ 2014
JSR 340: Servlet 3.1
• NIO.2 async I/O (Non-blocking I/O)
• Leverage Java EE concurrency
• Security improvements
• Web Sockets support
• Ease-of-Development
47. Hamed Hatami @ 2014
Servlet 3.1
@WebServlet(urlPatterns="/test", asyncSupported=true)
public class TestServlet extends HttpServlet {
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
AsyncContext ac = req.startAsync();
ac.addListener(new AsyncListener() {
public void onComplete(AsyncEvent event) throws IOException {
event.getSuppliedResponse().getOutputStream().print("Complete");
}
public void onError(AsyncEvent event) {
System.out.println(event.getThrowable());
}
public void onStartAsync(AsyncEvent event) {
}
public void onTimeout(AsyncEvent event) {
System.out.println("my asyncListener.onTimeout");
}
});
...
48. Hamed Hatami @ 2014
JSR 345: Enterprise JavaBeans 3.2
The scope of EJB 3.2 is intended to be relatively constrained in focusing
on these goals:
• Incremental factorization (Interceptors).
• Further use of annotations to simplify the EJB programming model.
• Proposed Optional: BMP/CMP.
• Proposed Optional: Web Services invocation using RPC.