Java EE 7: Boosting Productivity and Embracing HTML5

The Java EE 7 Platform
Productivity++ and HTML5
Arun Gupta
Director, Developer Advocacy, Red Hat
blog.arungupta.me, @arungupta

1Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

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Java: Broadest Industry Adoption

9,000,000
JAVA DEVELOPERS
DEPLOYING TO 18 COMPLIANT APPLICATION SERVERS


Java EE 7 Platform
Jun 12, 2013


Java EE 7 Themes
ENTERPRISE EDITION

MEETING
ENTERPRISE
DEMANDS

DEVELOPER
PRODUCTIVITY
Java EE 7

 More annotated POJOs
 Less boilerplate code
 Cohesive integrated
platform







WebSockets
JSON
Servlet 3.1 NIO
REST

 Batch
 Concurrency
 Simplified JMS

Top Ten Features in Java EE 7
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

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


Java API for WebSocket 1.0
Server and Client WebSocket Endpoint
Annotated: @ServerEndpoint, @ClientEndpoint
Programmatic: Endpoint

Lifecycle methods
Packaging and Deployment


@ServerEndpoint(“/chat”)
public class ChatServer {
@OnMessage
public void chat(String m) {
. . .
}
}

Chat Server
@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);
}
. . .


Chat Server (contd.)
. . .
@OnMessage
public void message(String message) {
for (Session peer : peers) {
peer.getRemote().sendObject(message);
}
}
}


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


Java API for JSON Processing 1.0
Streaming API

{
"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();
event = p.next();
event = p.next();
String name = p.getString();

// START_OBJECT
// KEY_NAME
// VALUE_STRING
// "John”

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


Batch Applications 1.0
Concepts

Batch
process
Manage
batch
process

Independent
sequential
phase of job
Chunk

Metadata for jobs


Batch Applications 1.0
Chunked Job Specification

<step id=”sendStatements”>
…implements ItemReader {
<chunk item-count=“3”>
public Object readItem() {
<reader ref=”accountReader”/>
// read account using JPA
<processor ref=”accountProcessor”/>
}
<writer ref=”emailWriter”/>
</step>
…implements ItemProcessor {
Public Object processItems(Object account) {
// read Account, return Statement
}
…implements ItemWriter {
public void writeItems(List accounts) {
// use JavaMail to send email
}

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
Submit Tasks to ManagedExecutorService using JNDI

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
}
}
}


Java Message Service 2.0
Get More from Less
Java EE 7

New JMSContext interface
AutoCloseable JMSContext, Connection, Session, …
Use of runtime exceptions
Method chaining on JMSProducer
Simplified message sending


Sending a Message using JMS 1.1
@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 Server
Specific Resources

Boilerplate Code

Exception Handling

Sending a Message

@Inject
JMSContext context;
@Resource(lookup = "java:global/jms/demoQueue”)
Queue demoQueue;
public void sendMessage(String payload) {
context.createProducer().send(demoQueue, payload);
}


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
Client API

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


Contexts and Dependency Injection 1.1
Automatic enablement for beans with scope annotation and EJBs
“beans.xml” is optional
Bean discovery mode
● all: All types
● annotated: Types with bean defining annotation
● none: Disable CDI
@Vetoed for programmatic disablement of classes
Global ordering/priority of interceptors and decorators

Bean Validation 1.1
Java EE 7

Alignment with Dependency Injection
Method-level validation
Constraints on parameters and return values
● Check pre-/post-conditions
Integration with JAX-RS


Bean Validation 1.1
Method Parameter and Result Validation

public void placeOrder(
@NotNull String productName,
Built-in
@NotNull @Max(“10”) Integer quantity,
@Customer String customer) {
Custom
//. . .
}
@Future
public Date getAppointment() {
//. . .
}

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


Servlet 3.1
Non-blocking I/O
Protocol Upgrade
Security Enhancements
<deny-uncovered-http-methods>: Deny request to HTTP methods not
explicitly covered


Servlet 3.1
Non-blocking I/O Traditional

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) {
. . .
}
}
}


Servlet 3.1
Non-blocking I/O: doGet

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


Servlet 3.1
Non-blocking read
@Override
public 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) {
. . .
}
}
. . .


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


Java EE 7 JSRs
CDI
Extensions

JSF 2.2,
JSP 2.3,
EL 3.0

Web
Fragments

JAX-RS 2.0,
JAX-WS 2.2

JSON 1.0

WebSocket
1.0

CDI 1.1

Interceptors
1.2, JTA 1.2

Common
Annotations 1.1

EJB 3.2

Managed Beans 1.0

JPA 2.1


JMS 2.0

Concurrency 1.0

JCA 1.7

Batch 1.0

Bean Validation 1.1

Servlet 3.1

DOWNLOAD
Java EE 7 SDK
oracle.com/javaee
GlassFish 4.0
Full Platform or Web Profile

glassfish.org


From JBoss Community

wildfly.org/download

Adopt-a-JSR
Participating JUGs


Java EE 7: Boosting Productivity and Embracing HTML5

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