AAI 1713-Introduction to Java EE 7

© 2015 IBM Corporation

AAI-1713Introduction to Java EE 7Kevin Sutter, STSMWebSphere Java EE Architect

Java: Broadest Industry Adoption

9,000,000JAVA DEVELOPERS

DEPLOYING TO 18 COMPLIANT APPLICATION SERVERS

Java EE 7 PlatformJun 12, 2013

Java EE 7 Themes

Batch Concurrency Simplified JMS

More annotated POJOs Less boilerplate code Cohesive integrated

platform

DEVELOPERPRODUCTIVITY

WebSockets JSON Servlet 3.1 NIO REST

MEETINGENTERPRISEDEMANDS

Java EE 7

Top Ten Features in Java EE 7

1. WebSocket client/server endpoints

2. Batch Applications

3. JSON Processing

4. Concurrency Utilities

5. Simplified JMS API

6. @Transactional and @TransactionScoped

7. JAX-RS Client API

8. Default Resources

9. More annotated POJOs

10. Faces Flow

Java API for WebSocket 1.0

• Server and Client WebSocket Endpoint

• Annotated: @ServerEndpoint, @ClientEndpoint

• Programmatic: Endpoint

• Lifecycle events support

• Standard Packaging and Deployment@ServerEndpoint("/chat")public class ChatServer {@OnMessagepublic void chat(String m) {. . .

}}

Available 4Q2014 via Liberty Repository!


@ServerEndpoint("/chat")

public class ChatBean {

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

@OnOpenpublic void onOpen(Session peer) {

peers.add(peer);}

@OnClosepublic void onClose(Session peer) {

peers.remove(peer);}

. . .

Chat Server


. . .

@OnMessage

public void message(String message) {

for (Session peer : peers) {peer.getRemote().sendObject(message);

}}

}

Chat Server (contd.)

JSON Processing 1.0

• API to parse and generate JSON

• Streaming API

• Low-level, efficient way to parse/generate JSON

• Similar to StAX API in XML world

• Object Model API

• Simple, easy to use high-level API

• Similar to DOM API in XML world


{

"firstName": "John", "lastName": "Smith", "age": 25,"phoneNumber": [

{ "type": "home", "number": "212 555-1234" },{ "type": "fax", "number": "646 555-4567" }

]}

JsonParser p = Json.createParser(...);JsonParser.Event event = p.next(); // START_OBJECTevent = p.next(); // KEY_NAMEevent = p.next(); // VALUE_STRINGString name = p.getString(); // "John”

Java API for JSON Processing 1.0

Streaming API

Batch Applications for Java Platform 1.0

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

• Batch execution: sequential, parallel, decision-based

• Processing Styles

• Item-oriented: Chunked (primary)

• Task-oriented: Batchlet

Available via Liberty Beta!

Batch Applications 1.0

Concepts

Metadata for jobs

Managebatchprocess

Batchprocess

Independentsequentialphase of job

Chunk

<step id="sendStatements"><chunk item-count="3">

<reader ref="accountReader"/><processor ref="accountProcessor"/><writer ref="emailWriter"/>

</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 statements) {

// use JavaMail to send email}

Batch Applications 1.0

Chunked Job Specification

Concurrency Utilities for Java EE 1.0

• Extension of Java SE Concurrency Utilities API

• Provide asynchronous capabilities to Java EE application components

• Provides 4 types of managed objects

• ManagedExecutorService

• ManagedScheduledExecutorService

• ManagedThreadFactory

• ContextService

• Context Propagation


Concurrency Utilities for Java EE 1.0

public class TestServlet extends HttpPServlet {

@Resource(name="java:comp/DefaultManagedExecutorService")ManagedExecutorService executor;

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

class MyTask implements Runnable {public void run() {

. . . // task logic}

}}

Submit Tasks to ManagedExecutorService using JNDI

Java Message Service 2.0

• New JMSContext interface

• AutoCloseable JMSContext, Connection, Session, …

• Use of runtime exceptions

• Method chaining on JMSProducer

• Simplified message sending

Get More from LessJava EE 7


@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) {

//. . .}

}}

}

Application ServerSpecific Resources

Boilerplate Code

Exception Handling


Sending a Message using JMS 1.1


@InjectJMSContext context;

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

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

}

Sending a Message

Java API for RESTful Web Services 2.0

• Client API

• Message Filters and Entity Interceptors

• Asynchronous Processing – Server and Client

• Common Configuration


Java API for RESTful Web Services 2.0

// 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);

Client API

Contexts and Dependency Injection 1.1

• Automatic enablement for beans with scope annotation andEJBs

• “beans.xml” is optional

• Bean discovery mode

• all: All types

• annotated: Types with bean defining annotation (default)

• none: Disable CDI

• @Vetoed for programmatic disablement of classes

• Global ordering/priority of interceptors and decorators


Bean Validation 1.1

• Alignment with Dependency Injection

• Method-level validation

• Constraints on parameters and return values

• Check pre-/post-conditions

• Integration with JAX-RS

Java EE 7


Built-in

Custom

@Futurepublic Date getAppointment() {

//. . .}

public void placeOrder(@NotNull String productName,@NotNull @Max("10") Integer quantity,@Customer String customer) {

//. . .}

Bean Validation 1.1

Method Parameter and Result Validation

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

• Entity Graphs


Servlet 3.1

• Non-blocking I/O

• Protocol Upgrade

• HttpUpgradeHandler – necessary for Web Sockets

• Security Enhancements

• <deny-uncovered-http-methods>: Deny request to HTTP

methods not explicitly covered by specified constaints


Servlet 3.1

public class TestServlet extends HttpServletprotected 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 I/O Traditional

Servlet 3.1

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

new MyReadListener(input, context));

Non-blocking I/O: doGet

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 read

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

• h:inputFile: New File Upload Component

Java Transaction API 1.2

@Transactional: Define transaction boundaries on CDI managed

beans

• @TransactionScoped: CDI scope for bean instances

scoped to the active JTA transaction

Java EE 7


EJB 3.2

Servlet 3.1

CDIExtensions

Be

an

Va

lid

ati

on

1.1

Batch 1.0

WebFragments

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

WebSphere Java EE 7 “Roadmap”

• Java EE 7 Statement of Direction• http://www-

01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS214-184/index.html&lang=en&request_locale=en

• IBM intends to deliver a Java EE 7 full platform compliant implementation of WebSphereApplication Server.

• IBM intends to deliver additional Java EE 7 components and additional technologies forWebSphere Application Server through continuous delivery of new features in the comingmonths.

• Liberty GA Deliverables of Java EE Features• Web Sockets 1.0 (4Q2014) and Web Sockets 1.1 (1Q2015)• Servlet 3.1 (4Q2014)• JSON-P 1.0 (4Q2014)• Concurrency Utilities 1.0 (4Q2014)• Java Server Pages (JSP) 2.3 (1Q2015)• Expression Language 3.0 (1Q2015)• Common Annotations 1.2 (1Q2015)• JDBC 4.1 (1Q2015)

• Liberty Beta (Preliminary versions of Java EE features)• https://www.ibmdw.net/wasdev/downloads/liberty-profile-beta/

• Future Content …• Extrapolate at your own speed…

http://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS214-184/index.html&lang=en&request_locale=en



https://www.ibmdw.net/wasdev/downloads/liberty-profile-beta/

Adopt-a-JSR

Participating JUGs

Sampling of Related Sessions…

• AAI-1713A: Introduction to Java EE 7• Monday, 2-3pm, Mandalay Bay, Reef Ballroom E

• AAI-1641A: Introduction to Web Sockets• Monday, 5-6pm, Mandalay Bay, Reef Ballroom E

• AAI-1313A: Agile Development Using Java EE 7 with WebSphere Liberty Profile(LAB)• Tuesday, 8-10am, Mandalay Bay, South Seas Ballroom D

• AAI-2236A: Using the New Java Concurrency Utilities with IBM WebSphere• Tuesday, 2-3pm, Mandalay Bay, Reef Ballroom D

• AAI-2235A: OpenJPA and EclipseLink Usage Scenarios Explained• Wednesday, 5:30-6:30pm, Mandalay Bay, Surf Ballroom A

• AAI-1610A: Configuring IBM WebSphere Application Server for EnterpriseMessaging Needs• Wednesday, 5:30-6:30pm, Mandalay Bay, Surf Ballroom E

• AAI-3085A: Don’t Wait! Develop Responsive Applications with Java EE7 Instead• Thursday, 10:30-11:30am, Mandalay Bay, Lagoon L

33

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AAI 1713-Introduction to Java EE 7

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