Java EE 7 in practise - OTN Hyderabad 2014

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

2. Java EE 7 in Practice
BluePrints Reborn
Jagadish Ramu
Application Server Team
jagadish.ramu@oracle.com

3. 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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4. Program Agenda
 Java EE 7
 Cargo Tracker (Blueprints)
 The API Changes + The Code!
 Looking Ahead…
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5. Java EE Past, Present and Future
J2EE 1.3
CMP,
Connector
Architecture
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J2EE 1.4
Web
Services
Mgmt,
Deployment,
Connectors
Inbound
Java EE 5
Ease of
Development,
EJB 3, JPA,
JSF, JAXB,
JAX-WS, StAX,
SAAJ
Java EE 6
Profiles,
CDI,
Validation,
Pruning,
Extensibility,
Ease of Dev,
JAX-RS
Web Profile
EJB 3.1 Lite
Servlet 3,
Java EE 7
JMS 2, Batch,
TX,
Concurrency,
Interceptor
WebSocket
JSON
Web Profile
JAX-RS 2
J2EE 1.2
Servlet, JSP,
EJB, JMS, RMI

6. Java EE 7
Portable
Extensions
JAX-RS
2.0
Common
Annotations 1.2
MMaannaaggeedd B Beeaannss 1 1.0.0 EEJJBB 3 3.2.2
Connector
Connector
1.7
1.7
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SSeerrvvlelet t3 3.1.1
Portable
Extensions
JJSSFF 2 2.2.2 JAX-RS
2.0
EELL 3 3.0.0
JJPPAA 2 2.1.1 JJTTAA 1 1.2.2
JJMMSS 2 2.0.0
JJSSPP 2 2.3.3
Common InInteterrcceepptotorrss 1 1.2.2 CCDDI I1 1.1.1
Annotations 1.2
Major Updated
Release
New
Concurrency Utilities
Concurrency Utilities
(JSR 236)
(JSR 236)
Batch Applications
Batch Applications
(JSR 352)
(JSR 352)
Java API for JSON
Java API for JSON
(JSR 353)
(JSR 353)
Java API for WebSocket
Java API for WebSocket
(JSR 356)
(JSR 356)

7. Java EE in Action
http://cargotracker.java.net
The Blueprints
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8. Domain Driven Design – Java EE Technologies/API
Interface
Application
Entities
Value Objects
Infrastructure
Repository
JSF
EJB
JPA Entity Manager
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JAX-RS Web Socket
JPA Entities
JPA Embeddable
Batch
JPA JMS JAX-RS Client EJB Client
CDI

9. Cargo Tracker – The Blueprints
Java EE features used in Cargo Tracker
Java EE API Features
JSF Facelets, templates, view parameters, view actions, message bundles, CDI compatible view scope, HTML 5 pass-though
attributes, HTML 5 pass-though elements
CDI Basic injection, scopes, named beans, qualifiers, events, observers, default enablement,
EJB Transactions, stateless session bean, message driven bean, startup singleton, CRON style scheduling, application exceptions,
XML deployment descriptors, portable activation configuration
JPA Generated ID, basic mapping, embeddables, many-to-one, one-to-many, enumerations, temporal types, named queries, managed
persistence context, portable data source definition, schema generation
JAX-RS REST endpoint, MIME types, client API, JSON processing, content-type negotiation
WebSocket Server-side endpoint, sending messages to remote endpoints, EJB integration
JSON-P Writing JSON using Streaming API
Bean
Validation
Basic validation annotations, method level validation for REST endpoints, method level validation for local EJB application
services
JMS JMS 2 simplified API message send, portable JMS resource definition
Java Batch Job operator, job XML, job properties, job context, job listener, skip listener, reader, writer, skippable exceptions, checkpointing,
chunking
JTA 1.2 @Transactional interceptor
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10. Cargo Tracker - Demo
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11. JMS 2
 API modernization
– Dependency injection
– Fluent APIs
– Intelligent defaults
– Unchecked exceptions
 New features
– Delivery delay, async send
 Platform alignment
– MDB activation properties, JMS resource definition
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Java EE 7

12. JMS 2 (Contd.)
Old API
@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);
}
}
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13. JMS 2 (Contd.)
Simplified API
@Inject
private JMSContext context;
@Resource(lookup = "jms/demoQueue")
private Queue demoQueue;
public void sendMessage (String payload) {
context.createProducer().send(demoQueue, payload);
}
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14. JMS 2 (Contd.)
Creating Resources
@JMSConnectionFactoryDefinition(
name="java:global/jms/demoConnectionFactory",
interfaceName= "javax.jms.ConnectionFactory",
description="ConnectionFactory to use in demonstration")
@JMSDestinationDefinition(
name = "java:global/jms/demoQueue",
description = "Queue to use in demonstration",
interfaceName = "javax.jms.Queue",
destinationName="demoQueue")
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15. Batch Processing
 API for robust batch processing targeted to Java EE, Java SE
 Common architecture
– Operator, repository, job, step, reader-processor-writer pattern
 Common features
– Chunking, check-pointing, transactions, retries, skippable-exceptions, workflow,
parallelism
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16. Batch Processing (Contd.)
API for Robust Batch Processing
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17. Batch Processing (Contd.)
Step Example
<step id=”sendStatements”>
<chunk reader=”accountReader”
processor=”accountProcessor”
writer=”emailWriter”
item-count=”10” />
</step>
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@Named(“accountReader")
...implements ItemReader... {
public Account readItem() {
// read account using JPA
@Named(“accountProcessor")
...implements ItemProcessor... {
Public Statement processItems(Account account) {
@Named(“emailWriter") // read Account, return Statement
...implements ItemWriter... {
public void writeItems(List<Statements> statements) {
// use JavaMail to send email

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Batch Jobs - Demo

19. Bean Validation 1.1
 Method constraints
– Very useful for JAX-RS and WebSocket
– Built-in and Custom Constraints
 CDI Alignment
– All Bean Validation artifacts now injection capable
 EL 3 integration
– More expressive validation messages
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Java EE 7

20. Bean Validation 1.1 (Contd.)
Method Level Constraints
public class Doctor {
public Doctor (@NotNull String name) { ... }
public void payFee(
@NotNull @Digits(integer=6, fraction=2) BigDecimal fee,
@NotNull @ValidCurrency String currencyType) {
}
@Future
public Date getAppointment() {
}
}
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21. JAX-RS 2
 Client API
 Message Filters & Entity Interceptors
– Servlet filters and CDI interceptors for JAX-RS
– Common configuration
 Asynchronous Processing – Server & Client
 Content negotiation
 Bean Validation 1.1 integration
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22. JAX-RS 2 (Contd.)
Client API
// Get instance of Client
Client client = ClientBuilder.newClient();
// Build the URI, build the request, and get response
String name = client.target(“http://example.com/orders/
{orderId}/customer”)
.resolveTemplate(”orderId", ”10”)
.queryParam(”shipped", ”true”)
.request()
.get(String.class);
// http://example.com/orders/10/customer?shipped=true
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23. Java API for JSON Processing
Reading JSON (Streaming API)
{
"firstName": "John", "lastName": "Smith", "age": 25,
"phoneNumber": [
{ "type": "home", "number": "212 555-1234" },
{ "type": "fax", "number": "646 555-4567" }
]
}
JsonParser parser = Json.createParser(…);
Event event = parser.next(); // START_OBJECT
event = parser.next(); // KEY_NAME - “firstname”
event = parser.next(); // VALUE_STRING - “John”
String name = parser.getString(); // "John”
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24. Java API for JSON Processing
Writing JSON (Object Model API)
JsonArray value =
Json.createArrayBuilder()
.add(Json.createObjectBuilder()
.add("type", "home")
.add("number", "212 555-1234")
)
.add(Json.createObjectBuilder()
.add("type", "fax")
.add("number", "646 555-4567")
)
.build();
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[
{
"type": "home”,
"number": "212 555-1234"
},
{
"type": "fax”,
"number": "646 555-4567"
}
]

25. Concurrency Utilities for Java EE
Managed Task Executor
public class TestServlet extends HTTPServlet {
@Resource(name=“concurrent/MyExecutorService”)
ManagedExecutorService executor;
Future future = executor.submit(new MyTask());
class MyTask implements Runnable {
public void run() {
... // Task logic
}
}
}
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26. Yet More…
 JPA 2.1
– Schema Generation, Entity Graphs
 JTA 1.2
– @Transactional, @TransactionScoped
 EL 3.0
– Standalone API, lambda expressions, collections, operators
 Servlet 3.1
– Non-blocking I/O, upgrade to WebSocket, security
 CDI 1.1
– Global enablement, @AroundConstruct, @Vetoed
 EJB 3.2
– Truncating CMP/BMP
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27. Java EE 8
 JSON-B
 JCache
 CDI 2
 More CDI/EJB alignment
 Security
 Action-oriented Web framework/HTML 5 alignment
 Cloud, PaaS, multitenancy/SaaS
 Configuration, deployment, management, monitoring?
 Further pruning?
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28. Java EE 8 Community Survey
https://blogs.oracle.com/ldemichiel/entry/results_from_the_java_ee
https://java.net/downloads/javaee-spec/JavaEE8_Community_Survey_Results.pdf
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29. Try it Out!
http://dlc.sun.com.edgesuite.net/glassfish/4.0.1/promoted/
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30. Resources
 Java EE Tutorials
– http://docs.oracle.com/javaee/7/tutorial/doc/home.htm
 Digging Deeper
– http://docs.oracle.com/javaee/7/firstcup/doc/home.htm
– https://glassfish.java.net/hol/
– https://java.net/projects/cargotracker/
 Java EE 7 Transparent Expert Groups
– http://javaee-spec.java.net
 Java EE 7 Reference Implementation
– http://glassfish.org
 The Aquarium
– http://blogs.oracle.com/theaquarium
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31. Copyright © 2012, Oracle and/or its affiliates. 41 All rights reserved.