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Java EE 6 application development, OSGi and Eclipse users

Roberto ChinniciJava EE 6 Specification LeadLudovic Champenois, GlassFish Tools Architect

JAVA EE 6

FINAL RELEASEDECEMBER 10, 2009

What's New?

• Several new APIs• Web Profile• Pluggability/extensibility• Dependency injection• Lots of improvements to existing APIs

New and updated components

• 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• JASPIC 1.1• JACC 1.5

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

Java EE 6 Web Profile Contents

JSF 2.0

JSP 2.2 · EL 2.2 · JSTL 1.2 · JSR-45 1.0

Servlet 3.0

EJB 3.1 Lite · DI 1.0 · CDI 1.0 · Managed Beans 1.0

Bean Validation 1.0 · Interceptors 1.1 · JSR-250 1.1

JPA 2.0 · JTA 1.1

Pluggability/Extensibility

• Focus on the web tier in this release• Create a level playing field for third-party frameworks• Simplify packaging of web applications

Modular Web Applications

• Libraries can contain /META-INF/web-fragment.xml• web.xml is optional• @WebServlet, @WebFilter annotations• ServletContainerInitializer interface• Programmatic registration of components• Resource jars containing /META-INF/resources

Sample Web Fragment Descriptor

<web-fragment version=”3.0” xmlns="http://java.sun.com/xml/ns/javaee"> <servlet> <servlet-name>welcome</servlet-name> <servlet-class>WelcomeServlet</servlet-class> </servlet> <listener> <listener-class>RequestListener</listener-class> </listener></web-fragment>

JAX-RS 1.1

• RESTful web services API• Already widely adopted• Really a general, high-level HTTP API• Annotation-based programming model• Programmatic API when needed

JAX-RS Sample

@Path(“widgets/{id}”)@Produces(“application/widgets+xml”)public class WidgetResource { public WidgetResource(@PathParam(“id”) String id) {…}

@GET public Widget getWidget() {…}

@PUT public void putWidget(Widget widget){…}}

Bean Validation 1.0

• Integrated with JSF, JPA• Declarative constraints using annotations @NotNull @Size(max=40) String address;• Fully extensible: define your own constraints @Email String recipient;• Validator API for programmatic validation validator.validate(obj) → Set<ConstraintViolation>

EJB 3.1

• @Singleton beans• @Startup beans• @Asynchronous invocations @Asynchronous public Future<Integer> compute();• Define EJBs directly inside a web application• EJBContainer API works on Java SE

Adding an EJB to a Web Application

BuyBooks.warBuyBooks.war ShoppingCartShoppingCartEJB ClassEJB Class

ShoppingCart.jarShoppingCart.jar

BuyBooks.earBuyBooks.ear BuyBooks.warBuyBooks.war

ShoppingCartShoppingCartEJB ClassEJB Class

BeforeBefore NowNow

Dependency Injection

• DI + CDI (JSR-330 + JSR-299)• @Resource still around @Resource DataSource myDB;• Added @Inject annotation for typesafe injection @Inject @LoggedIn User user;• Automatic scope management (request, session, etc.)• No configuration: beans discovered at startup• Extensible via the BeanManager API

Dependency Injection Sample

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

Injection points identified by Qualifier + Type@Default can be omitted

JSF 2.0

• Facelet as a standard view declaration language• Composite components• Automatic discovery of component libraries• Programmatic and declarative Ajax support• System events• Validation out-of-the-box

Java EE 6 Platform

• More powerful• More flexible• More extensible• Easier to use

http://java.sun.com/javaee

What is GlassFish

• A Community– Users, Partners, Testers, Developers– Started in 2005 on http://java.net

• Application Server– Enterprise Quality and Open Source (CDDL & GPL v2)– Java EE 5 / 6 Reference Implementation

• Full Commercial Support from Oracle– Not only a Reference Implementation– Roadmap announced tomorrow regarding HA, Clustering...

GlassFish v3...

• The Java EE 6 spec, of course, and...• Beyond the spec

– Fast, very fast, small, very small– restart, btrace/dtrace, embedded, modularity, OSGi, RESTful

Admin,...– Scripting: jRoR, Grails, and now Django

• Update Center: repository of new/updated bundles• Tooling: Netbeans 6.8, IntelliJ,vi, and

– Eclipse 3.5, 3.6Mx

Modular and Dynamic

• Modular : OSGi: Equinox and Apache Felix• But also Equinox or Static mode, thanks to HK2

– Yet very Fast !

• Painless Java EE 6 development – Via the new/easier APIs– Via better tools integration– Ultra fast Auto-deploy of all Java EE and static artifacts– Application runner

• java -jar glassfish.jar foo.war

Web Session Retention

• Deployment option to maintain stateful sessions across re-deployments– $ asadmin redeploy --properties keepSessions=true myapp.war– Enabled by Default in Eclipse IDE

• For All sessions:– Servlets, CDIs, Stateful EJBs,...

• Greatly simplifies the development paradigm

GlassFish and OSGi

• GlassFish runs on top of OSGi (Felix and Equinox)– GlassFish ships with 200+ bundles

• Can use OSGi management tools (CLI or Web)• Any OSGi bundle will run in GlassFish v3

– Drop it in domain1/autodeploy/bundles – Can also asadmin deploy it using --type osgi

• Consume OSGi services via @Resource @Resource (mappedName="MYPUREOSGISERVICE") HelloService myOSGiService; • Web Application Bundle (WAB Support)

Demo

• GlassFish Java EE dev in Eclipse

Integration with maven 2

• Java EE 6 APIs in Maven repository– http://download.java.net/maven/2/javax/javaee-api/ – Stripped jars: very small <1Mb– Not to be used for Testing

• GlassFish Embbeded can run via Maven– mvn gf:run

Update Center: Add/Remove/Update Bundles

Thanks for your attention!

• http://java.sun.com/javaee• http://glassfish.org