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Java EE
The Evolution of a Platform
Andrei Niculae
Technology Presales Consultant
The following 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.
2
Java EE 6 Overview
4
May 1998
JPE Project
Sep 2001 13 Specs
J2EE 1.3
CPM, Connector Architecture
May 2006 23 specs
Java EE 5
Ease ofDevelopment
Annotations
EJB 3.0
Persistence API
New andUpdatedWeb Services
Dec 1999 10 specs
J2EE 1.2
Servlet, JSP, EJB, JMS
Nov 2003 20 specs
J2EE 1.4
WebServices
Management
Deployment
Java EE 6
Pruning
Extensibility
Ease of Development
EJB Lite
RESTful WS
CDI
Managed Beans
Java EE Web
Profile
Dec 2009 28 specs
Java EE: Past & Present
Java EE 6 Goals
DeveloperProductivity
Flexible&
Lightweight Extensible
•Web Profile
•Pruning
• Embrace open source frameworks
• More annotations• POJO development• Less XML configuration
Java EE
What’s New in Java EE 6?
• Several new APIs
• Web Profile
• Pluggability / extensibility
• Dependency injection
• Lots of improvements to existing APIs
What's new in the Java EE 6 PlatformNew and updated components
• EJB 3.1(+Lite)
• JPA 2.0
• Servlet 3.0
• JSF 2.0
• JAX-RS 1.1
• Bean Validation 1.0
• DI 1.0
• CDI 1.0
• Connectors 1.6
• Managed Beans 1.0
• Interceptors 1.1
• JSP 2.2
• EL 2.2
• JSR 250 1.1
• JASPIC 1.1
• JACC 1.5
• JAX-WS 2.2
• JSR 109 1.3
EJB 3.1
• No interface view – one source file per bean
• Simple POJO
• Much simpler to declare/work with
• Singleton
• EJB Timers
EJB 3.1 Lite
A proper subset of the full EJB 3.1 API that includes a small, powerful selection of EJB features
What's new in the Java EE 6 PlatformNew and updated components
• EJB 3.1(+Lite)
• JPA 2.0
• Servlet 3.0
• JSF 2.0
• JAX-RS 1.1
• Bean Validation 1.0
• DI 1.0
• CDI 1.0
• Connectors 1.6
• Managed Beans 1.0
• Interceptors 1.1
• JSP 2.2
• EL 2.2
• JSR 250 1.1
• JASPIC 1.1
• JACC 1.5
• JAX-WS 2.2
• JSR 109 1.3
JPA 2.0Type-safe Criteria API
EntityManager em = getEntityManager();
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Employee> query =
cb.createQuery(Employee.class);
Root<Employee> employee = query.from(Employee.class);
query.where(cb.equal(employee.get("firstName"),
"Bob"));
List<Employee> result =
em.createQuery(query).getResultList();
What's new in the Java EE 6 PlatformNew and updated components
• EJB 3.1(+Lite)
• JPA 2.0
• Servlet 3.0
• JSF 2.0
• JAX-RS 1.1
• Bean Validation 1.0
• DI 1.0
• CDI 1.0
• Connectors 1.6
• Managed Beans 1.0
• Interceptors 1.1
• JSP 2.2
• EL 2.2
• JSR 250 1.1
• JASPIC 1.1
• JACC 1.5
• JAX-WS 2.2
• JSR 109 1.3
Servlets 3.0
Servlets 3.0Extensibility
• Plugin libraries using web fragments• Modular web.xml
• Bundled in framework JAR file in META-INF Directory
• Zero-configuration, drag-and-drop for web Frameworks
• Servlets, servlet filters, context listeners for a framework get discovered and registered by the container
What's new in the Java EE 6 PlatformNew and updated components
• EJB 3.1(+Lite)
• JPA 2.0
• Servlet 3.0
• JSF 2.0
• JAX-RS 1.1
• Bean Validation 1.0
• DI 1.0
• CDI 1.0
• Connectors 1.6
• Managed Beans 1.0
• Interceptors 1.1
• JSP 2.2
• EL 2.2
• JSR 250 1.1
• JASPIC 1.1
• JACC 1.5
• JAX-WS 2.2
• JSR 109 1.3
Bean Validation
• Tier-independent mechanism to define constraints for data validation
• @NotNull(message=”...”), @Max, @Min, @Size
• Integrated with JSF and JPA
• JSF: f:validateRequired, f:validateRegexp
• JPA: pre-persist, pre-update, and pre-remove
• Fully Extensible
What's new in the Java EE 6 PlatformNew and updated components
• EJB 3.1(+Lite)
• JPA 2.0
• Servlet 3.0
• JSF 2.0
• JAX-RS 1.1
• Bean Validation 1.0
• DI 1.0
• CDI 1.0
• Connectors 1.6
• Managed Beans 1.0
• Interceptors 1.1
• JSP 2.2
• EL 2.2
• JSR 250 1.1
• JASPIC 1.1
• JACC 1.5
• JAX-WS 2.2
• JSR 109 1.3
Context and Dependency Injection (CDI)
• Opt-in technology on a per-module basis– META-INF/beans.xml
– WEB-INF/beans.xml
• @Resource only for container-provided objects
• Use @Inject for application classes
@Inject @LoggedIn User user;
Context and Dependency Injection (CDI)
• Managed beans on steroids
• Opt-in technology on a per-module basis– META-INF/beans.xml
– WEB-INF/beans.xml
• @Resource only for container-provided objects
• Use @Inject for application classes
@Inject @LoggedIn User user;
The type describes the capabilities (methods)
Context and Dependency Injection (CDI)
• Managed beans on steroids
• Opt-in technology on a per-module basis– META-INF/beans.xml
– WEB-INF/beans.xml
• @Resource only for container-provided objects
• Use @Inject for application classes
@Inject @LoggedIn User user;
Qualifiers describes qualities/characteristics/identity
What's new in the Java EE 6 PlatformNew and updated components
• EJB 3.1(+Lite)
• JPA 2.0
• Servlet 3.0
• JSF 2.0
• JAX-RS 1.1
• Bean Validation 1.0
• DI 1.0
• CDI 1.0
• Connectors 1.6
• Managed Beans 1.0
• Interceptors 1.1
• JSP 2.2
• EL 2.2
• JSR 250 1.1
• JASPIC 1.1
• JACC 1.5
• JAX-WS 2.2
• JSR 109 1.3
Managed Beans
• Plain Java objects (POJOs)
• Foundation for other component types
• Fully support injection (@Resource,
@Inject)
• @PostConstruct, @PreDestroy
callbacks
• Optional name
Sample Managed Beans
@ManagedBean
public class SpaceCapsule {
@Resource
DataSource configDB;
public launch() {
// ...
}
}
@ManagedBean("yuri")
public class Cosmonaut
{
@Resource
SpaceCapsule vostok;
@PostConstruct
orbitEarth() {
// ...
}
}
UniformityCombination of annotations "just work"
• Example: JAX-RS resource classes are POJOs
• Use JAX-RS-specific injection capabilities
• But you can turn resource classes into managed
beans or EJB components ...
• ... and use all new services !
JAX-RS SampleUsing JAX-RS injection annotations
@Path("root")
public class RootResource {
@Context UriInfo ui;
public RootResource() { ... }
@Path("{id}")
public SubResource find(@PathParam("id") String id) {
return new SubResource(id);
}
}
JAX-RS SampleAs a managed bean, using @Resource
@Path("root")
@ManagedBean
public class RootResource {
@Context UriInfo ui;
@Resource DataSource myDB;
public RootResource() { ... }
@Path("{id}")
public SubResource find(@PathParam("id") String id) {
return new SubResource(id);
}
}
JAX-RS SampleAs an EJB, using @Resource and security annotations
@Path("root")
@Stateless
public class RootResource {
@Context UriInfo ui;
@Resource DataSource myDB;
public RootResource() { ... }
@Path("{id}")
@RolesAllowed("manager")
public SubResource find(@PathParam("id") String id) {
return new SubResource(id);
}
}
JAX-RS SampleAs a CDI bean, using @Inject and scope annotations
@Path("root")
@ApplicationScoped
public class RootResource {
@Context UriInfo ui;
@Inject @CustomerDB DataSource myDB;
@Inject @LoggedIn User user;
public RootResource() { ... }
@Path("{id}")
public SubResource find(@PathParam("id") String id) {
// ...
}
}
How to Obtain UniformityCombination of annotations "just work"
• Annotations are additive
• New behaviors refine pre-existing ones
• Strong guidance for new APIs
Classes can evolve smoothly
Java EE 6 Web ProfileNew, updated components and unchanged components
• EJB 3.1 Lite
• JPA 2.0
• Servlet 3.0
• JSF 2.0
• Bean Validation 1.0
• DI 1.0
• CDI 1.0
• Managed Beans 1.0
• Interceptors 1.1
• JSP 2.2
• EL 2.2
• JSR 250 1.1
• JSR-45 1.0
• JSTL 1.2
• JTA 1.1
JEE BenefitsA Better Platform
• Less boilerplate code than ever
• Fewer packaging headaches
• Uniform use of annotations
• Sharing of resources to avoid
duplication
• Dependency Injection
• Strongly-typed decorators
• ... and more!
Future Java EE
Java EE for the Cloud
• Applications are versioned
• Multiple versions can coexist
• Must deal with data versioning, upgrades, etc.
• Need ability to specify QoS properties
• Applications both expose and connect to services
• Common management and monitoring interfaces
• Evolution, not revolution
Cloud Platform
Application
Virtualization Layer
State Management
JavaService
PersistenceService
QueueingService
…
Cloud Platform
Application
CodeModule
CodeModule
Schema MigrationQoS
InformationSecurity
CodeModule
…
Virtualization Layer
State Management
JavaService
PersistenceService
QueueingService
…
Cloud Platform
Application Application Application
Virtualization Layer
State Management
JavaService
PersistenceService
QueueingService
…
Cloud Platform
Application Application Application Application Application
Virtualization Layer
State Management
JavaService
PersistenceService
QueueingService
…
Cloud Platform
Managed Environment
Application Application Application
Virtualization Layer
State Management
JavaService
PersistenceService
QueueingService
…
Application Application
Java EE 7 Content (so far)
• Filed and voted !– Java EE 7 (JSR 342)
– JPA 2.1 (JSR 338)
– JAX-RS 2.0 (JSR 339)
– Servlet 3.1 (JSR 340)
– JSF 2.2 (JSR 344)
– EL 3.0 (JSR 341)
– JMS 2.0 (JSR 343)
Java EE 7 Content (so far)
• Other– JCache revived (JSR 107)
– Concurrency Utilities (236)
– MRs: JSR250, JAX-WS 2.3, JTA 1.2, JSP 2.3, connectors
– EJB 3.2
– Bean Validation 1.1
– JSR-330 1.1
– CDI 1.1
• Yet to be filed– JSON 1.0
Java EE 7 - When?
• Late 2012
• Date-driven release
– (anything not ready will be deferred to Java EE 8)
• Participate !
– Expert Groups still forming, consider joining
– JCP membership free for individuals
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