Java EE 6 Platform
Overview and Highlights
Roberto Chinnici
JSR-316 Specification Lead
Sun Microsystems, Inc.
1

Contents
Goals
•
Features
•
Component JSRs
•
Highlights
•
Schedule
•
Sun Confidential: Internal Only 2

Goals for the Java EE 6 Platform
Easier to use
•
More flexible
•
Easier to learn
•
Easier to evolve going forward
•
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Profiles
Platform Evolution Java EE 6
EJB Lite
Ease of
Restful WS
Development Web Beans
Java EE 5 Validation
Web Extensibility
Ease of
Services
Development
J2EE 1.4 Annotations
EJB 3.0
Web Services,
Robustness
Persistence API
Management,
J2EE 1.3 New and
Deployment,
Enterprise
Updated
CMP, Async.
Java Platform
Web Services
Connector
Connector
Java EE 6
J2EE 1.2 Architecture
Web Profile
Servlet, JSP,
EJB, JMS
JPE
RMI/IIOP
Project
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Major New Features in Java EE 6
Profiles
•
Pruning
•
Extensibility
•
More ease of development
•
Sun Confidential: Internal Only 5

Profiles
A profile is a targeted bundle of technologies
•
Rules set by the Java EE Platform spec
•
Profiles can be subsets, supersets, overlapping
•
Define immediately a Web Profile
•
JCP process for future profiles
•
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Pruning
• Make some technologies optional
• Same rules as proposed by Java SE
> “pruned now, optional in the next release”
• Pruned status will be marked out in the javadocs
• Current pruning list:
> JAX-RPC, EJB Entity Beans, JAXR, JSR-88
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Extensibility
• Embrace open source libraries, frameworks
• Full pluggability in the web container
• No configuration needed for web frameworks
> Discover servlet, servlet filters, listeners for a framework
> Dynamically add servlets, filters to an application
• Used to support scripting languages
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Proposed Components (1)
Full JSRs
EJB 3.1 (JSR 318) PFD
•
PFD
• JPA 2.0 (JSR 317)
PR DONE
Servlet 3.0 (JSR 315)
•
JSF 2.0 (JSR 314) PFD SOON
•
JAX-RS 1.0 (JSR 311) COMPLETED
•
Connector Architecture 1.6 (JSR 322) PFD
•
PR DONE
Bean Validation 1.0 (JSR 303)
•
JCDI 1.0 (née Web Beans) (JSR 299) PR DONE
•
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Proposed Components (2)
Maintenance Releases
JAXB 2.2 COMPLETED
•
SOON
• JAX-WS 2.2
SOON
JSR-109 1.3
•
JAX-RS 1.1 COMPLETED
•
EL 1.2
•
JSP 1.2
•
Authentication SPI 1.1 (JSR-196) COMPLETED
•
Common Annotations 1.1 (JSR-250)
•
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Web Profile
• A fully functional mid-sized profile for web apps
• Accepted:
> Servlet 3.0, JSP 2.1, JSR-45, EL 1.2, JSTL 1.2, JSF 2.0
> EJB Lite 3.1, JTA 1.1, JPA 2.0, JSR-250
> Bean Validation 1.0
• Not decided yet:
> Web Beans 1.0
• Out for now:
> JAX-RS 1.1
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Servlet 3.0 Highlights (1)
• Annotations to define web components
> @WebServlet @WebFilter @WebListener
• Greatly reduced editing of web.xml
• File upload
• Customizable session cookie configuration
> ServletContext.getSessionCookieConfig method
• Selectable session tracking modes
> ServletContext.setSessionTrackingMode
> ServletContext.getEffectiveSessionTrackingModes
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Servlet 3.0 Highlights (2)
• Modular web.xml using fragments
> WEB-INF/lib/mylib.jar → META-INF/web-fragment.xml
• New initializers for extensions
> ServletContainerInitializer interface
• Programmatic API for dynamic registration of servlets
and filters
> ServletContext.addServlet/addFilter methods
• Ability to tweak servlet/filter configuration at startup
> ServletRegistration interface
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Servlet 3.0 Async Processing
• Use cases: Comet, chat rooms, long waits
• Opt-in system for servlets, filters
> @WebServlet(asyncSupported=true)
> @WebFilter(asyncSupported=true)
• Enter async mode explicitly:
> AsyncContext ctx = ServletRequest.startAsync(...)
• Then:
> ctx.dispatch(...) // to somebody else
> ctx.start(Runnable) // to an async action
> ctx.complete() // done processing
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EJB 3.1 Highlights
• Singleton beans
> @Singleton
• No-interface view
• Calendar timers
> @Schedule(dayOfWeek=“Fri”, hour=”12”)
• Non-persistent timers
> @Schedule(minute=”*/10”, hour=”*”, persistent=false)
• Async business methods
> @Asynchronous public Future<Result> compute(...)
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EJB 3.1 Lite
• Simple, modern subset of EJB for use outside of the
full platform
• Contents:
Session beans (stateful, stateless, singletons)
>
Transaction and security attributes
>
Interceptors
>
ejb-jar.xml
>
• Embeddable container API
• Bootstraps on Java SE
• Beans looked up in JNDI by global name
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EJB Components in a Web Module
• EJB components can be defined directly inside a web
module (war file)
• Things to keep in mind:
java:comp is shared by all components
>
A single class loader is used
>
Local view scoped to the web module
>
Descriptor WEB-INF/ejb-jar.xml
>
or META-INF/ejb-jar.xml in a jar inside WEB-INF/lib
> No entity beans
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Multiple JNDI scopes
• Familiar with java:comp
• Now adding:
> java:module module-scoped, like inside a war file
> java:application application-scoped
> java:global scoped to multiple applications
• Usable throughout
> @Resource(name=”java:module/env/db”) DataSource db;
• EJBs are automatically registered
> java:global/myApp/myModule/MyBean!com.acme.MyInterface
> java:module/MyBean // shorthand
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JPA 2.0 Highlights
• Metamodel API
> OO view on entities, managed types, etc.
> EntityManagerFactory.getMetaModel
• Typesafe metamodel
Generated by tools and stored in a persistence unit
>
Typesafe view of attributes, including collections
>
@Entity public class Order { … }
>
@TypesafeMetamodel public class Order_ { … }
>
• Criteria API to build queries in Java
> Alternative to JPAQL
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JPA 2.0 Criteria Query Example
SELECT o.quantity, a.zipcode
FROM Customer c JOIN c.orders o JOIN c.address a
WHERE a.state = 'CA’
ORDER BY o.quantity, a.zipcode
@PersistenceUnit EntityManagerFactory emf;
QueryBuilder qb = emf.getQueryBuilder()
CriteriaQuery q = qb.create();
Root<Customer> c = q.from(Customer.class);
Join<Customer, Order> o = c.join(Customer_.orders);
Join<Customer, Address> a = c.join(Customer_.address);
q.where(qb.equal(a.get(Address_.state), \"CA\"));
q.orderBy(qb.asc(o.get(Order_.quantity)),
qb.asc(a.get(Address_.zipcode)));
q.select(o.get(Order_.quantity), a.get(Address_.zipcode));
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Bean Validation (JSR-303)
• Now included in Java EE 6
• Integrated with JSF 2.0 and JPA 2.0
• Examples:
> @NotNull @Size(max=40) private String streetName;
> @NotNull @Valid private Country country;
• TraversableResolver for object graph validation
• Validation API *
> Set<ConstraintViolation> Validator.validate(Object)
• Validator and ValidatorFactory will be injectable
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JCDI (formerly known as Web Beans)
• Type-based dependency injection
> @LoggedIn User user;
> @Produces @LoggedIn User getLoggedInUser() { … }
• Context management
> @RequestScoped, @SessionScoped, @ConversationScoped, ...
• Reflective API
> Manager, Context, InjectionPoint
• Heavy use of meta-annotations
> @BindingType public @interface LoggedIn {}
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JCDI Basics
• Resolution is by bean type and binding type(s)
> bean type + set(binding types) → bean
Not string based!
•
@LoggedIn User = (User, @LoggedIn) → bean
•
Bean ≠ Class
•
Beans are enabled/disabled in batches via
•
deployment types
• Put as much info as possible on bean class
> @ConversationScoped @Current
public class ShoppingCart {}
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JCDI Example
@ConversationScoped @Current
public class ShoppingCart { … }
@PayByCreditCard
public class CreditCardPaymentProcessor implements PaymentProcessor
{…}
public class Checkout {
private @Current ShoppingCart cart;
private @PayByCreditCard PaymentProcessor payByCard;
public void checkout() { … }
}
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Transparency
• JAX-RS 1.0 was done completely in the open
Public expert group mailing list and meeting minutes
>
Public issue tracker
>
Public spec drops
>
Open source reference implementation
>
• JSF 2.0 opened up its mailing list recently
• All other Java EE JSRs to follow shortly
• Commitment to transparency going forward
> All Java EE 7 JSRs will be done in the open from the
very beginning
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Schedule
Public review of all specs completed
•
Proposed final drafts in progress
•
Final release September 2009
•
Implementation: GlassFish V3
•
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Q&A
Sun Confidential: Internal Only 27

Java EE 6 Platform
Overview and Highlights
Roberto Chinnici
roberto.chinnici@sun.com
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