JavaEE 6, una descripción técnica

11

<Insert Picture Here>

Java EE 6, a Technical Overview

3

Java EE

• Scalable and maintainable enterprise apps• Container vs. Developer

– Life-cycle, resource injection, security, ...• Portable code

– Portable skills– Vendor independence

• Industry standard– large developer community,– books, training, best practices, consultants, ...

4

Java EE 6 Overview

• New features– Web Profile, REST, managed beans,

standard dependency injection, validation

• Enhanced APIs– EJB 3.1, JSF 2.0, JPA 2.0, Servlet 3.0

• More ease of use– Optional XML, simpler packaging, extensibility

• Usable “as is”– The end of the 100's MB .war

5

May 1998

Project JPE

Dec 199910 specs

J2EE 1.2

EnterpriseApplication

ServletJSPEJBJMSRMI/IIOP

Sept 200113 specs

J2EE 1.3

RobustScalable

CMPJCA

Nov 200320 specs

J2EE 1.4

Web Services

WSManagementDeployment

May 200623 specs

Java EE 5

Ease ofdevelopment

AnnotationsEJB 3JPA 1.0WS-*JSF

Q4 200928 specs

Java EE 6

Ease ofdevelopment

(web)

EJB 3.1JPA 2.0Servlet 3.0JSF 2.0JAX-RS 1.1CDI 1.0@InjectBean Validat°

Web Profile

ManagedBean

Java EE – a brief History

6

EJB 3.1 JPA 2.0 Servlet 3.0 JSF 2.0 JAX-RS 1.1 Connectors 1.6 Bean Validation 1.0

DI 1.0 CDI 1.0 Managed Beans 1.0 Interceptors 1.1 JAX-WS 2.2 JSR-109 1.3 JSP 2.2 / EL 2.2 JSR-250 1.1

New and improved specifications

7

This is no science fiction

Java EE 6 and GlassFish Server 3 shipped final releases on

December 10th 2009

8

JAX-RS

• RESTful web services API• Already widely adopted• Really a general, high-level HTTP API• Annotation-based programming model• Programmatic API when needed• JAX-RS 1.1 integration with EJBs

9

JAX-RS sample code

@Path("widgets/{id}")@Produces("application/widgets+xml")public class WidgetResource { public WidgetResource( @PathParam("id") String id) { ... }

@GET Widget getWidget() { ... }}

10

Bean Validation 1.0

public class Address { @NotNull @Size(max=30, message="longer than {max} characters") private String street1; ... @NotNull @Valid private Country country;}

public class Country { @NotNull @Size(max=20) private String name; ...}

request recursiveobject graphvalidation

11

Build your own!

@Size(min=5, max=5)@ConstraintValidator(ZipcodeValidator.class)@Documented@Target({ANNOTATION_TYPE, METHOD, FIELD})@Retention(RUNTIME)public @interface ZipCode { String message() default "Wrong zipcode"; String[] groups() default {};}

Integrated in JPA and JSF Bootstrap APIs

12

“Web” Profile

• First Java EE profile to be defined• A fully-functional, mid-size stack for modern web application development

• Complete, but not the kitchen sink

13

Java EE 6 Web Profile

Servlet 3.0 JSP 2.2 / EL 2.2 JSR-45 1.0 JSTL 1.2 JSF 2.0 Bean Validation 1.0 EJB 3.1 Lite

JPA 2.0 JTA 1.1 DI 1.0 CDI 1.0 Managed Beans 1.0 Interceptors 1.1 JSR-250 1.1

14

Extensible & Pluggable

• Focus on the web tier in this release• Create a level playing ground forthird-party libraries and frameworks

• Simplify packaging of web apps

15

Modular Web Applications

• Libraries can contain web-fragment.xml•web.xml is optional•@WebServlet, @WebFilter annotations•ServletContainerInitializer interface• Programmatic registration• Resource jars

16

JSF 2.0

• Optional faces-config.xml• Standardized facelets• Auto-discovery of component libraries• Composite components• Ajax support (with or without JavaScript)• Even a JavaScript API !

17

EJB 3.1

•@Singleton beans•@Startup beans•@Asynchronous invocations•@Schedule tasks•EJBContainer API works on Java SE• No-interface view (1 EJB = 1 class!)• Define EJBs directly inside a web app

18

Packaging in a war

foo.ear

com/acme/Foo.class

WEB-INF/web.xmlWEB-INF/classes com/acme/FooServlet.class

com/acme/FooEJB.classcom/acme/FooEJBLocal.class

lib/foo_common.jar

foo_web.war

foo_ejb.jar

foo.war

WEB-INF/classes com/acme/Foo.class com/acme/FooServlet.class com/acme/FooEJB.class

19

Dependency Injection

• Context & Dependency Injection (CDI)• JSR 299 with JSR-330 (@Inject)• Context management (conversation), events,

alternatives, stereotypes, decorators & more

• Beans discovered at startup• Injection metamodel (BeanManager API)•@Resource still around

20

Qualified injection

@Inject @Premium Customer cust;

qualifier (user-defined label)

i.e. « which one? »

typ

e

inje

ctio

n p

oin

t

21

Qualifier Annotation

@Target({TYPE,METHOD,PARAMETER,FIELD})@Retention(RUNTIME)@Documented@Qualifierpublic @interface Premium {…}

@Premium // my own qualifierpublic class SpecialCustomer implements Customer { public void buy() {…}}

22

Qualified injection

@Inject @Premium Customer cust;

qualifier (user-defined label)

i.e. « which one? »

typ

e

inje

ctio

n p

oin

t

23

Contexts (the 'C' in CDI)

• Built-in “Web” Scopes :– @RequestScoped, @SessionScoped, @ApplicationScoped

– @ConversationScoped

public class CheckoutHandler { @Inject CheckoutHandler(@LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default Cart cart) { ... }}

Client is not context-aware

24

A lot more to CDI

• Alternatives• Events• Stereotypes• Consumer/Producer• Decorator• Portable extensions• etc...

25

This is no science fiction

Java EE 6 and GlassFish Server 3 shipped final releases on

December 10th 2009

26

A word on GlassFish

• Production-Quality Open Source Server• Java EE 6 (full platform, web profile)• Modular (HK2, OSGi)• Developer-friendly (you judge!)

• GlassFish 3.1 now available!• Clustering, centralized admin• Load-balancing, HA• more...

• http://glassfish.org

GlassFish and WebLogic Together

WebLogic Server

Production Java Application Deployment

GlassFish Server

Production Java Application Deployment

• Best open source application server with support from Oracle

• Open source platform of choice for light- weight Web applications

• Focus on latest Java EE standards and community driven innovation

• Certified interoperability with Fusion Middleware

• Differentiated innovation, scout thread

• Best commercial application server for transactional Java EE applications

• Platform of choice for standardization

• Focus on lowest operational cost and mission critical applications

• integration with Oracle Database, Fusion Middleware & Fusion Applications

28

The following/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.

29

References

• glassfish.org• oracle.com/goto/glassfish• blogs.sun.com/theaquarium• glassfish.org/roadmap• youtube.com/user/GlassFishVideos• Follow @glassfish

<Insert Picture Here>

Java EE 6, a Technical Overview

http://oracle.com/javaeehttp://glassfish.org