Java ee 7 New Features

Java EE 7 – New
Features?
Presenter: Shahzad Badar

Agenda
 Who am I?
 Java EE 7 – New Features?
Pakistan Java User Group

Who am I?
A programmer working on java since
2002
Spent most of the time in Islamabad
Leading Pakistan Java User Group
Working in Royal Cyber

Catch me
@shahzadbadar
shahzadbadar@gmail.com
http://www.implementsjava.com

Java EE 6 - Achievements
 50,000,000 + downloads
 #1 choice for enterprise developers
 #1 application development platform
 Fastest adoptions of any Java EE release – 18 complaint
servers

Java EE 6 – Main Features
 Web Profile
 EJB packaged in war
 Optional web.xml
 Type-safe dependency injection
 CDI Events
 JSF standardizing on facelets
 @Schedule

JEE 7 Theme

Active JSRs
 JSR 342: Java EE 7 Platform
 JSR 338: Java API for RESTful Web Services 2.0
 JSR 339: Java Persistence API 2.1
 JSR 340: Servlet 3.1
 JSR 341: Expression Language 3.0
 JSR 343: Java Message Service 2.0
 JSR 344: JavaServer Faces 2.2
 JSR 345: Enteprise JavaBeans 3.2
 JSR 346: Contexts and Dependency Injection 1.1
 JSR 349: Bean Validation 1.1
 JSR 236: Concurrency Utilities for Java EE 1.0
 JSR 352: Batch Applications for the Java Platform 1.0
 JSR 353: Java API for JSON Processing 1.0
 JSR 356: Java API for WebSocket 1.0

Concurrency and Java EE
 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
 Provides simple, safe API for concurrency in Java EE
 Builds on Java SE concurrency
java.util.concurrent.ExecutorService

Batch Applications for the Java
Platform
 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.

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.

Bean Validation 1.1
 Method constraints
 Bean Validation artifacts injectable
 Fixes, clarifications and enhancements

Bean Validation 1.1
Method Level Constraints
public void placeOrder( @NotNull String productName,
@NotNull @Max(“10”) Integer quantity,
@Customer String customer) {
. . .
}
@Future
public Date getAppointment() {
. . .
}

JSF 2.2
 HTML5 Support
 @FlowScoped
 @ViewScoped for CDI
 Managed beans deprecated/CDI alignment
 File upload component
 View actions
 Multi-templating
 Security
 Fixes and enhancements

JSON Processing Support
 JSON (JavaScript Object Notation) 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
{
“employee": [
{ "firstName":"John" , "lastName":"Doe" },
{ "firstName":"Anna" , "lastName":"Smith" },
{ "firstName":"Peter" , "lastName":"Jones" }
]
}
JSON Example

JSON Implementations for Java
 org.json.
 org.json.me.
 Jackson JSON Processor.
 Json-lib.
 JSON Tools.
 Stringtree.
 SOJO.
 Jettison.
 json-taglib.
 XStream.
 Flexjson.
 JON tools.
 Argo.
 jsonij.
 fastjson.
 mjson.
 jjson.
 json-simple.
 json-io.
 JsonMarshaller.
 google-gson.
 Json-smart.
 FOSS Nova JSON.
 Corn CONVERTER.
a lot of implementations for other languages

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

JSON Processing Support
 API to parse and generate JSON
 Streaming API
 Low level efficient way to parse/generate JSON
 Provide pluggability for parser/generator
 Object Model
 Simple, Easy-to-use high-level API
 Implemented on top of Streaming API

Java API for JSON Processing
Writing JSON (Object Model API)
“employees": [
{ “firstName": “Asif", “lastName": ”Naveed” },
{ “firstName": “Khalid", “lastName": ”Ali” }
]
JsonObject jsonObject =
new JsonBuilder() .beginArray(“employees")
.beginObject() .add(“firstName", “Asif")
.add(“lastName", “Naveed") .endObject()
.beginObject () .add(“firstName", “Khalid")
.add(“lastName", “Ali").endObject()
.endArray() .build();

Java API for JSON Processing
{
"firstName": "Javaid", "lastName": “Shah", "age": 19,
"phoneNumber": [
{ "type": “cell", "number": “03218983449" },
{ "type": "fax", "number": “02142423212" }
]
}
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(); // "Javaid”
Reading JSON (Streaming API)

Web Socket Support
In age of Web 2.0 / 3.0 , We need interactive websites
but
In the standard HTTP model, a server cannot initiate a connection
with a client nor send an unrequested HTTP response to a client;
thus, the server cannot push asynchronous events to clients.

Why WebSocket?
 HTTP is half duplex
 HTTP is verbose
 Hacks for Server Push
 Polling
 Long Polling
 Comet/Ajax
 Complex, Wasteful, Inefficient

HTTP Communication

Polling

Long Polling

HTTP Streaming (Comet)

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

WebSocket to rescue

“Reducing kilobytes of data to 2
bytes…and reducing latency from
150ms to 50ms is far more than
marginal. In fact, these two factors
alone are enough to make Web Sockets
seriously interesting to Google.”

Java WebSocket Implementations

WebSocket API
Connection Life Cycle
@Singleton
@WebSocketEndpoint(path=”/chat”)
public class ChatServer {
Set<Session> peers = ...
@WebSocketOpen
public void onOpen(Session peer) { peers.add(session);
}
@WebSocketClose
public void onClose(Session session) {
peers.remove(session);
}
...

WebSocket API
WebSocket Communication
. . .
@WebSocketMessage
public void message(String message, Session client)
throws IOException {
for (Session session : peers) {
if (!session.equals(client)) {
session.getRemote().sendObject(message);
}
}
}
}

JPA 2.1 – New Features
The first spec to include new features is the JPA 2.1. The new
features can be described with the following short list:
 Multi-Tenancy (Table discriminator)
 Stored Procedures
 Custom types and transformation methods - Query
by Example
 Dynamic PU Definition
 Schema Generation (Additional mapping metadata
to provide better standardization)

Servlet 3.1 – New Features
NIO.2 async I/O
Leverage Java EE concurrency
Security improvements
Web Sockets support
Ease-of-Development

Enteprise JavaBeans 3.2 – New
Features
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

Java EE 8 Plan
 JSON-B
 JCache
 More CDI/EJB alignment
 Cloud, PaaS, multitenancy/SaaS
 JMS.next()?
 JAX-RS.next()?
 Modularity?
 NoSQL?
 Action-oriented Web framework/HTML 5?
 Configuration API?
 Security?

References
 http://www.oracle.com/technetwork/java/javaee/index.
html
 https://blogs.oracle.com/arungupta/
 http://www.infoq.com/presentations/Java-EE-7-8

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