1 Java EE 6 = Less Code + More Power Arun Gupta, Java EE & GlassFish Guy blogs.oracle.com/arungupta, @arungupta
May 27, 2015
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Java EE 6 = Less Code + More Power
Arun Gupta, Java EE & GlassFish Guyblogs.oracle.com/arungupta, @arungupta
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The Java EE 6 Platform
Servlets 3.0
JSP 2.2
JSF 2.0
EJB 3.1 Lite
JTA 1.1 ManagedBeans 1.0
JPA 2.0
CDI 1.0
BeanValidation1.0
Interceptors1.1
JAX-WS
JAX-RS
JAXB
EJB 3.1
JASPIC
JDBC
JNDI
JMS
JAXP
JAX-RPC . . .
SAAJ
JACC
JavaMail
StAX
New Updated Contributed by RedHat Web Profile 1.0
● Java EE 6 Web Profile● Pruning
● Pruned today, means– Optional in the next release– Deleted in the subsequent releases
● Technologies marked in Javadocs– EJB 2.x Entity Beans, JAX-RPC, JAXR, JSR 88
Light-weight
● EJB-in-WAR● No-interface EJB● Optional
“web.xml”/”faces-config.xml”
● Annotation-driven● @Schedule● @Path● @Inject● . . .
<web-fragment> <filter> <filter-name>wicket.helloworld</filter-name> <filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class> <init-param> <param-name>applicationClassName</param-name> <param-value>...</param-value> </init-param> </filter>
<filter-mapping> <filter-name>wicket.helloworld</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-fragment>
From the real users ...Developers can concentrateon business logic, Java EE 6 is providing a standard for the infrastructure.
Jigsaw puzzle, Modular, standard, less xml, easy, easy, have I said easy?
Higher integrated specs,simple and annotation driven,single-classloader WARs,next level of industry standard
Standards compliance, vendor independence, milliseconds and kilobyte deployment
http://blogs.oracle.com/arungupta/tags/community+feedback
Faster development, less frameworks, less complexity, more great code shipped
Not your fat grandfather's enterprise Java anymore, enterprise Java renaissance
Definite excuse to avoid Spring forever
Simplified Java Development, Focus on building great products
Compatible Java EE 6 Impls
Today:
Announced:
Web Profile Only
3.1 Overview
● Built on GlassFish 3● Modular and Extensible HK2 Kernel
● ~260+ modules● OSGi/Java EE Hybrid Apps
● Clustering and High Availability● HTTP, EJB, IIOP, SSO, Metro
● Containers start on demand● End-to-end extensibility
Sample App Overview
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
What will we do ?
1. Generate JPA Entities from the database table
2. Refactor generated entities for a more intuitive O/R mapping
3. Create an EJB for querying the database
4. Create a Servlet for testing the EJB and displaying values from the database table
5. Enable CDI and make the EJB EL-injectable
6. Display the values in JSF2/Facelets-based view
7. Expose JPA entities as a RESTful resource by using JAX-RS
What will we use ?
Generate JPA EntitiesAnd customize them
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
Java Persistence API 2● 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]
Create an EJBFor querying the database
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
Create an EJB – Sample CodeFor querying the database
@PersistenceContextEntityManager em;
public List<Customer> getCustomers() {return (List<Customer>)em.createNamedQuery("Customer.findAll").getResultList();}
EJB 3.1● Simplified Packaging● 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
Create a ServletFor testing EJB and display values from the database
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
Create a Servlet – Sample CodeFor testing EJB and display values from the database
@EJB CustomerSessionBean ejb;
out.println(ejb.getCustomers());
http://localhost:8080/JavaEE6SampleApp/TestServlet
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● . . .
Enable CDIMake the EJB EL-injectable
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
Enable CDI – Sample CodeMake the EJB EL-injectable
@javax.inject.Named
Contexts & Dependency Injection
● Standards-based Dependency Injection● Type-safe – Buids on @Inject API● Context/Scope management● Strong Typing, Loose Coupling● Includes ELResolver
@Inject @LoggedIn User user
RequestInjection What ?
(Type)Which one ?
(Qualifier)
@Inject @LoggedIn User
CDI
● Qualifiers● Events● Stereotypes● Interceptors● Decorators● Alternatives● . . .
Display the valuesIn JSF2/Facelets-based view
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
Display the values – Sample CodeIn JSF2/Facelets-based view
http://localhost:8080/JavaEE6SampleApp/faces/index.xhtml
<h1>Java EE 6 Sample App</h1>
<center>Powered by GlassFish!</center>
<h:dataTable value="#{customerSessionBean.customers}" var="c"><h:column>#{c.name}</h:column><h:column>#{c.customerId}</h:column></h:dataTable>
Java Server Faces 2.0
● 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● ...
RESTful resourceUsing JAX-RS
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
RESTful resource – Sample CodeUsing JAX-RS
@Path("/customers")
http://localhost:8080/JavaEE6SampleApp/resources/customers/customer/1
@Produces({"application/xml", "application/json"})
@GET@Path("/customer/{id}")@Produces("application/xml")public Customer getCustomer(@PathParam("id")Integer id) {return(Customer)em.createNamedQuery("Customer.findByCustomerId").setParameter("customerId", id).getSingleResult();}
JAX-RS 1.1
● Java API for building RESTful Web Services● POJO based● Annotation-driven● Server-side API● HTTP-centric
Sample App Review
DatabaseEJB
CLI
Servlet
JSFJAX-RSCDI
JPA
Java EE for the Cloud : JSR 342● More easily operate on private/public clouds
● Multi-tenancy● Elasticity● Service Provisioning
● Tighter requirements for resource/state management● Better isolation between applications● Potential standard APIs for NRDBMS, Caching, other● Common management and monitoring interfaces● Better packaging● Evolution, not revolution
Java EE 7 : Technology Refresh
● Ease-of-development: JMS 2.0● Latest web standards
● New JSRs: Web Sockets, Java JSON API● HTTP Client API (JAX-RS 2.0)
● Possible JSRs inclusion● Concurrency Utilities for Java EE (JSR 236)● JCache (JSR 107)
Java EE 7 – When ?
● Late 2012● Date-driven release
● Anything not ready will be deferred to Java EE 8● Participate
● Expert Groups forming● Public discussion lists● JCP membership free for individuals
Transparency Checklisthttp://jcp.org/en/resources/transparency
● EG members names● EG business reported on a publicly
readable alias● Schedule is public, current and updated
regularly● Public can read/write to a wiki● Discussion board on jcp.org● Public read-only issue tracker
NEW
● Find out what's new with Java technology● See new tools and techniques● Learn how to create solutions● Network with peers● Meet with experts● Influence the future of the Java platform● 400+ sessions/BoFs/HOLs● . . . oracle.com/javaone
References
● oracle.com/javaee● glassfish.org● oracle.com/goto/glassfish● blogs.oracle.com/theaquarium● youtube.com/GlassFishVideos● Follow @glassfish
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Java EE 6 = Less Code + More Power
Arun Gupta, Java EE & GlassFish Guyblogs.oracle.com/arungupta, @arungupta