OTN Developer Days - Java EE 6

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What's new in Java EE 6 ?
Arun Gupta
blogs.sun.com/arungupta, @arungupta

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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.

3
Compatible Java EE 5 Impl
http://java.sun.com/javaee/overview/compatibility-javaee5.jsp

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Compatible Java EE 6 Impls
Today:
Announced:

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Goals for the Java EE 6 Platform
• Flexible & Light-weight
• JAX-RPC, EJB 2.x Entity Beans, JAXR, JSR 88
• Extensible
• Embrace Open Source Frameworks
• Easier to use, develop on
• Continue on path set by Java EE 5

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Java EE 6 Web Profile 1.0
• Fully functional mid-sized profile
• Actively discussed in the Java EE 6 Expert
Group and outside it
• Technologies
• Servlets 3.0, JSP 2.2, EL 2.2, Debugging Support for
Other Languages 1.0, JSTL 1.2, JSF 2.0, Common
Annotations 1.1, EJB 3.1 Lite, JTA 1.1, JPA 2.0, Bean
Validation 1.0, Managed Beans 1.0, Interceptors 1.1,
Context & Dependency Injection 1.0, Dependency
Injection for Java 1.0

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Java EE 6 - Done
• Specifications approved by the JCP
• Reference Implementation is GlassFish v3
• TCK D
ec
2009

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Java EE 6 Specifications
• The Platform
• Java EE 6 Web Profile 1.0
• Managed Beans 1.0

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New
• Contexts and Dependency Injection for
Java EE (JSR 299)
• Bean Validation 1.0 (JSR 303)
• Java API for RESTful Web Services (JSR 311)
• Dependency Injection for Java (JSR 330)

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Extreme Makeover
• Java Server Faces 2.0 (JSR 314)
• Java Servlets 3.0 (JSR 315)
• Java Persistence 2.0 (JSR 317)
• Enterprise Java Beans 3.1 & Interceptors 1.1
(JSR 318)
• Java EE Connector Architecture 1.6 (JSR 322)

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Updates
• Java API for XML-based Web Services 2.2 (JSR 224)
• Java API for XML Binding 2.2 (JSR 222)
• Web Services Metadata MR3 (JSR 181)
• JSP 2.2/EL 2.2 (JSR 245)
• Web Services for Java EE 1.3 (JSR 109)
• Common Annotations 1.1 (JSR 250)
• Java Authorization Contract for Containers 1.3 (JSR 115)
• Java Authentication Service Provider Interface for
Containers 1.0 (JSR 196)

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As is
• JDBC 4.0 API
• Java Naming and Directory Interface 1.2
• Java Message Service 1.1
• Java Transaction API 1.1
• Java Transaction Service 1.0
• JavaMail API Specification 1.4
• JavaBeans Activation Framework 1.1
• Java API for XML Processing 1.3
• Java API for XML-based RPC 1.1
• SOAP with Attachments API for Java 1.3
• Java API for XML Registries 1.0
• Java EE Management Specification 1.1 (JSR 77)
• Java EE Deployment Specification 1.2 (JSR 88)
• Java Management Extensions 1.2
• Java Authentication and Authorization Service 1.0
• Debugging Support for Other Languages (JSR 45)
• Standard Tag Library for JSP 1.2 (JSR 52)
• Streaming API for XML 1.0 (JSR 173)

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Java EE 6 & Ease-of-development
• Continue advancements of Java EE 5
• Primary focus: Web Tier
• General principles
• Annotation-based programming model
• Reduce or eliminate need for DD
• Traditional API for advanced users

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Managed Beans 1.0
• JavaBeans component model for Java EE
• Simple and Universally useful
• Advanced concepts in companion specs
• Basic Services
• Resource Injection, Lifecycle Callbacks, Interceptors
• Available as
• @Resource / @Inject
• java:app/<module-name>/<bean-name>
• java:module/<bean-name>

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public class MyManagedBean {
public void setupResources() {
// setup your resources
}
public void cleanupResources() {
// collect them back here
}
public String sayHello(String name) {
return "Hello " + name;
}
}
Managed Beans 1.0 - Sample
@Resource
MyManagedBean bean;
@javax.annotation.ManagedBean
@PostConstruct
@PreDestroy
@Inject
MyManagedBean bean;
http://blogs.sun.com/arungupta/entry/totd_129_managed_beans_1

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Servlets in Java EE 5
At least 2 files

<web-app>
<servlet>
<servlet-name>MyServlet
</servlet-name>
<servlet-class>
com.sun.MyServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet
</servlet-name>
<url-pattern>/myApp/*
</url-pattern>
</servlet-mapping>
...
</web-app>
/* Code in Java Class */
package com.sun;
public class MyServlet extends
HttpServlet {
public void
doGet(HttpServletRequest
req,HttpServletResponse res)
{
...
}
...
}

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Servlets 3.0 (JSR 315)
Annotations-based @WebServlet
http://blogs.sun.com/arungupta/entry/totd_81_getting_started_with
package com.sun;
@WebServlet(name=”MyServlet”, urlPatterns={”/myApp/*”})
public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest req,
HttpServletResponse res)
{
...
}

<web-app>
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>
com.sun.MyServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/myApp/*</url-pattern>
</servlet-mapping>
...
</web-app>

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Servlets 3.0
• @WebServlet, @WebListener, @WebFilter, …
• Asynchronous Servlets
• @WebServlet(asyncSupported=true)
• Plugin libraries using web fragments
• Dynamic registration of Servlets
• WEB-INF/lib/[*.jar]/META-INF/resources
accessible in the root
• Programmatic authentication login/logout
• Default Error Page
• . . .

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EJB 3.1 (JSR 318)
Package & Deploy in a WAR
myApp.ear
web.war
WEB-INF/web.xml
WEB-INF/classes
com.sun.FooServlet
com.sun.TickTock
beans.jar
com.sun.FooBean
com.sun.FooHelper
myApp.war
WEB-INF/classes
com.sun.FooServlet
com.sun.TickTock
com.sun.FooBean
com.sun.FooHelper
web.xml ?
Java EE 5 Java EE 6
http://blogs.sun.com/arungupta/entry/totd_95_ejb_3_1

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public class MySessionBean {
public void setupResources() {
// setup your resources
}
public void cleanupResources() {
// collect them back here
}
public String sayHello(String name) {
return "Hello " + name;
}
}
EJB 3.1 - Sample
@EJB
MySessionBean bean;
@Stateless
@PostConstruct
@PreDestroy

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EJB 3.1
• No interface view – one source file per bean
• Embeddable API
• @Singleton
• Initialization in @PostContruct
• Simplified Cron-like syntax for Timer
• Asynchronous Session Bean
• Portable Global JNDI Name

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EJB 3.1
EJB 3.1 Lite – Feature Comparison

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Contexts & Dependency Injection
(JSR 299)
• Standards-based Dependency Injection
• Type-safe – Buids on @Inject API
• Context/Scope management
• Includes ELResolver
@Inject @LoggedIn User user
Request
Injection
What ?
(Type)
Which one ?
(Qualifier)
@Inject @LoggedIn User

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CDI
• Qualifiers
• Events
• Stereotypes
• Interceptors
• Decorators
• Alternatives
• . . .

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Java Server Faces 2.0 (JSR 314)
• Facelets as “templating language” for the page
• Custom components much easier to develop
• Integrated Ajax
• “faces-config.xml” optional in common cases
• Default navigation rules
• Much more …
• Runs on Servlet 2.5+
• Bookmarkable URLs
• Conditional navigation
• ...

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Java Persistence API 2 (JSR 317)
• Improved O/R mapping
• Type-safe Criteria API
• Expanded and Richer JPQL
• 2nd-level Cache
• New locking modes
• PESSIMISTIC_READ – grab shared lock
• PESSIMISTIC_WRITE – grab exclusive lock
• PESSIMISTIC_FORCE_INCREMENT – update version
• Standard configuration options
• javax.persistence.jdbc.[driver | url | user | password]

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Bean Validation (JSR 303)
• Tier-independent mechanism to define
constraints for data validation
• Represented by annotations
• javax.validation.* package
• Integrated with JSF and JPA
• JSF: f:validateRequired, f:validateRegexp
• JPA: pre-persist, pre-update, and pre-remove
• @NotNull(message=”...”), @Max, @Min,
@Size
• Fully Extensible
• @Email String recipient;

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JAX-RS 1.1 (JSR 311)
• Java API for building RESTful Web Services
• POJO based
• Annotation-driven
• Server-side API
• HTTP-centric

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JAX-RS 1.1
Code Sample - Simple
public class HelloWorldResource {
public String sayHello() {
return "Hello World";
}
public String morning() {
return “Good Morning!”;
}
}
@Path("helloworld")
@Context UriInfo ui;
@GET
@Produces("text/plain")
@GET
@Path("morning")

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What does Java EE offer to Cloud ?
●
Containers
●
Injectable services
●
Scale to large clusters
●
Security model
●
. . .

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What can Java EE do for Clouds ?
●
Tighter requirements for resource and state
management
●
Better isolation between applications
●
Potential standard APIs for NRDBMS, Caching, …
●
HTML5
●
Common management and monitoring interfaces
●
Better packaging
●
Apps/Data are (multiple) versioned, Upgrades,
Expose/Connect to services, QoS attributes, ...
●
Evolution, not revolution

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What else is coming in JavaEE.next?
• Modularity
• Build on Java SE work
• Applications made of modules
• Dependencies are explicit
• Versioning is built-in
• Web socket support
• Standard JSON API
• HTML5 support
• NIO.2-based web container

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What is GlassFish ?
• A community
• Users, Partners, Testers, Developers, ...
• Started in 2005 on java.net
• Application Server
• Open Source (CDDL & GPL v2)
• Java EE Reference Implementation

GlassFish Distributions
Distribution License Features
GlassFish Open Source
Edition 3.0.1
CDDL &
GPLv2
• Java EE 6 Compatibility
• No Clustering
• Clustering planned in 3.1
• mod_jk for load balancing
GlassFish Open Source
Edition 2.1.1
CDDL &
GPLv2
• Java EE 5 Compatibility
• In memory replication
• mod_loadbalancer
Oracle GlassFish Server
3.0.1
Commercial • GlassFish Open Source Edition 3.0.1
• GlassFish Server Control
• Clustering planned in 3.1
Oracle GlassFish Server
2.1.1
Commercial • GlassFish Open Source Edition 2.1.1
• Enterprise Manager
• HADB
Clustering
Coming
Soon!

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

OTN Developer Days - Java EE 6

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