otn tour 2013: what's new in java ee 7

What's new in Java EE 7?

Bruno BorgesOracle Product Manager e Java Evangelistblogs.oracle.com/brunoborges@brunoborges

Copyright © 2013, Oracle and/or its affiliates. All rights reserved.

Hola!

@brunoborgesblogs.oracle.com/brunoborges


The preceding is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.


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Top Ten Features in Java EE 6

1. EJB packaging in a WAR2. Type-safe dependency injection3. Optional deployment descriptors (web.xml, faces-config.xml)

4. JSF standardizing on Facelets5. One class per EJB6. Servlet and CDI extension points7. CDI Events8. EJBContainer API9. Cron-based @Schedule10. Web Profile

Launched in December 2009


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Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Insert Information Protection Policy Classification from Slide 13

Java EE 7- Productivity- HTML5 Support- Enterprise Demands


Trends versus Spring


Java EE 7 Themes

More annotated POJOs Less boilerplate code Cohesive integrated platform Default resources

Batch Applications Concurrency Utilities Simplified JMS and

Compatibility

WebSocket JSON Processing Servlet 3.1 NIO REST HTML5-Friendly

Markup


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EJB 3.2

Servlet 3.1

CDIExtensions

Batch 1.0

Web Fragments

Java EE 7 JSRs

JCA 1.7JMS 2.0JPA 2.1

Managed Beans 1.0

Concurrency 1.0Common

Annotations 1.1Interceptors1.2, JTA 1.2✔

CDI 1.1

JSF 2.2,JSP 2.3,EL 3.0

JAX-RS 2.0,JAX-WS 2.2

JSON 1.0WebSocket

1.0


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Top 10 Features Java EE 7

WebSocket client/server endpoints Batch Applications JSON Processing Concurrency Utilities Simplified JMS API @Transactional and @TransactionScoped! JAX-RS Client API Default Resources More annotated POJOs Faces Flow


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Java API for WebSocket 1.0Annotated Endpointimport javax.websocket.*;

@ServerEndpoint("/hello")public class HelloBean {

@OnMessage public String sayHello(String name) { return “Hello “ + name; }}


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Java API for WebSocket 1.0

@ServerEndpoint("/chat")

public class ChatBean {

static Set<Session> peers = Collections.synchronizedSet(…);

@OnOpen public void onOpen(Session peer) {peers.add(peer);}

@OnClose public void onClose(Session peer) {peers.remove(peer);}

@OnMessage

public void message(String message, Session client) { peers.forEach(peer -> peer.getRemote().sendObject(message);

}}

Chat Server


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Java API for JSON Processing 1.0

API to parse and generate JSON Streaming API

– Low-level, efficient way to parse/generate JSON– Provides pluggability for parsers/generators

Object Model API– Simple, easy-to-use high-level API– Implemented on top of Streaming API

Binding JSON to Java objects forthcoming


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{

"firstName": "John", "lastName": "Smith", "age": 25, "phoneNumber": [ { "type": "home", "number": "212 555-1234" }, { "type": "fax", "number": "646 555-4567" } ]}

Iterator<Event> it = parser.iterator();

Event event = it.next(); // START_OBJECT

event = it.next(); // KEY_NAME

event = it.next(); // VALUE_STRING

String name = parser.getString(); // "John”

Java API for JSON Processing 1.0Streaming API – JsonParser


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Batch Applications 1.0

Suited for non-interactive, bulk-oriented and long-running tasks

Computationally intensive Can execute sequentially/parallel May be initiated

– Adhoc– Scheduled

No scheduling APIs included


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Job: Batch process Step: Independent, sequential phase of job

– Reader, Processor, Writer

Job Operator: Manage batch processing Job Repository: Metadata for jobs


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<step id=”sendStatements”> <chunk reader ref=”accountReader” processor ref=”accountProcessor” writer ref=”emailWriter” chunk-size=”10” /></step>

…implements ItemReader {public Object readItem() { // read account using JPA}

…implements ItemProcessor {Public Object processItems(Object account) { // read Account, return Statement}

…implements ItemWriter {public void writeItems(List accounts) { // use JavaMail to send email}

Job Specification Language – Chunked Step


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Concurrency Utilities for Java EE 1.0

Provide asynchronous capabilities to Java EE application components

– Without compromising container integrity

Extension of Java SE Concurrency Utilities API (JSR 166)

Support simple (common) and advanced concurrency patterns


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Provide 4 managed objects– ManagedExecutorService

– ManagedScheduledExecutorService

– ManagedThreadFactory

– ContextService

Context propagation Task event notifications Transactions


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public class TestServlet extends HTTPServlet { @Resource(name=“concurrent/BatchExecutor”) ManagedExecutorService executor;

Future future = executor.submit(new MyTask());

class MyTask implements Runnable { public void run() { . . . // task logic } }}

Submit Tasks to ManagedExecutorService using JNDI


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Java API for RESTful Web Services 2.0

Client API Message Filters and Entity Interceptors Asynchronous Processing – Server and Client Common Configuration


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Java API for RESTful Web Services 2.0Client API

// Get instance of ClientClient client = ClientBuilder.newClient(); // Get customer name for the shipped productsString name = client.target(“../orders/{orderId}/customer”) .resolveTemplate(”orderId", ”10”) .queryParam(”shipped", ”true”) .request() .get(String.class);


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Java Message Service 2.0

Simplified API– Less verbose– Reduced boilerplate code– Resource injection

– Try-with-resources for Connection, Session, etc.

Both in Java EE and SE


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@Resource(lookup = "myConnectionFactory”)ConnectionFactory connectionFactory;

@Resource(lookup = "myQueue”)Queue myQueue;

public void sendMessage (String payload) { Connection connection = null; try { connection = connectionFactory.createConnection(); Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); MessageProducer messageProducer = session.createProducer(myQueue); TextMessage textMessage = session.createTextMessage(payload); messageProducer.send(textMessage); } catch (JMSException ex) { //. . . } finally { if (connection != null) { try { connection.close(); } catch (JMSException ex) {

//. . . } } }}

Sending a Message using JMS 1.1

Application Server Specific Resources

Boilerplate Code

Exception Handling


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@InjectJMSContext context;

@Resource(lookup = "java:global/jms/demoQueue”)Queue demoQueue;

public void sendMessage(String payload) { context.createProducer().send(demoQueue, payload);}

Sending message using JMS 2.0


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Bean Validation 1.1

Alignment with Dependency Injection Method-level validation

– Constraints on parameters and return values– Check pre-/post-conditions


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Bean Validation 1.1Method Parameter and Result Validation

Built-in

Custom

@Futurepublic Date getAppointment() { //. . .}

public void placeOrder( @NotNull String productName, @NotNull @Max(“10”) Integer quantity, @Customer String customer) { //. . .}


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Java Persistence API 2.1

Schema Generation– javax.persistence.schema-generation.* properties

Unsynchronized Persistence Contexts Bulk update/delete using Criteria User-defined functions using FUNCTION Stored Procedure Query


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Servlet 3.1

Non-blocking I/O Protocol Upgrade Security Enhancements

– <deny-uncovered-http-methods>: Deny request to HTTP methods not explicitly covered


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Servlet 3.1

public class TestServlet extends HttpServlet protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { ServletInputStream input = request.getInputStream(); byte[] b = new byte[1024]; int len = -1; while ((len = input.read(b)) != -1) { . . . } }}

Non-blocking IO - Traditional


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Servlet 3.1

AsyncContext context = request.startAsync();ServletInputStream input = request.getInputStream();input.setReadListener( new MyReadListener(input, context));

Non-blocking I/O: doGet Code Sample


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Servlet 3.1

@Overridepublic void onDataAvailable() { try { StringBuilder sb = new StringBuilder(); int len = -1; byte b[] = new byte[1024]; while (input.isReady() && (len = input.read(b)) != -1) { String data = new String(b, 0, len); System.out.println("--> " + data); } } catch (IOException ex) { . . . }}. . .

Non-blocking I/O: MyReadListener Code Sample


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JavaServer Faces 2.2

Faces Flow Resource Library Contracts HTML5 Friendly Markup Support

– Pass through attributes and elements

Cross Site Request Forgery Protection Loading Facelets via ResourceHandler File Upload Component


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Java Transaction API 1.2

@Transactional: Define transaction boundaries on CDI managed beans

@TransactionScoped: CDI scope for bean instances scoped to the current JTA transaction


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Novas Possibilidades com Java EE 7

Camada Web 100% server-side

– JSF 100% client-side

– JAX-RS + WebSockets + (Angular.JS) Híbrido

– Utilize o que achar conveniente, e melhor, para cada caso da aplicação


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Novas Possibilidades com Java EE 7

Camada Back-end Java EE Web Profile

– EJB3 Lite + CDI + JTA + JPA Java EE Full Profile

– WebP + JMS + JCA + Batch


glassfish.org


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Call to Action

• Specs: javaee-spec.java.net

• Implementation: glassfish.org

• The Aquarium: blogs.oracle.com/theaquarium

• Adopt a JSR: glassfish.org/adoptajsr

• NetBeans: wiki.netbeans.org/JavaEE7


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Grácias!

@brunoborgesblogs.oracle.com/brunoborges


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Preguntas?


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otn tour 2013: what's new in java ee 7

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