JBoss AS7 OSDC 2011

JBoss Application Server (AS) 7 Jason Shepherd Middleware Support Engineer, Red Hat November 17 th , 2011

Introducing JBoss AS 7
Application Server
Key features
Java Enterprise Edition (JEE) 6
EJB 3.1
Managed Beans
Context and Dependency Injection
Integration Testing with Arquallian
demo

Community vs Enterprise Releases
JBoss AS 7.0.2 current
EE 6 Web Profile
JBoss AS 7.1
EE 6 Full Certification
EAP 6 due in early 2012
JBoss EAP 6 based on AS 7.1

Key features – Lightweight Container
Fast startup, < 3 sec
Lazy loading of services
Simplified Classloading
Deploys isolated from container
User focused configuration
A single configuration file
Manage multiple instances at once
Domain mode
Smaller memory footprint
Cloud readiness

Fast Startup
Services are started on demand
CDI beans.xml triggers CDI service (Weld)
No need to Slim unused features

Simplified Classloading
Java EE service dependencies only
/WEB-INF/beans.xml exposes org.jboss.weld.core
Greeter cannot access org.slf4j
com.redhat.greeter org.slf4j org.jboss.weld.core

Benefits of Java EE?
Standard platform comprised of managed components & services
Write business logic as components
Less code
Higher signal-to-noise ratio
Powerful mechanisms for free
Portable knowledge

Drawbacks of Java EE 5
@Local and @Remote interfaces
Non Embeddable EJB container
Complex packaging
Verbose XML configuration
Boilerplate JNDI lookups

EJB 3.1 to the rescue!
No more @Local and @Remote
Embeddable EJB container
EJBs in WAR
Annotation based configuration
EJB in light weight Web Profile

EE 6 Web profile– Key components
Managed Beans (JSR-330)
Google and SpringSource submitted JSR-330 with the aim of standardising "a proven, non-controversial set of annotations that make injectable classes portable across frameworks"
Context and Dependency Injection (CDI)
Implemented with WELD on AS 7
EJB 3.1
No Local and Remote Interfaces
EJBs in WAR archives!

What are managed beans?
Everyone throwing around this term “bean”
JSF
EJB
Seam
Spring
Guice
CDI
Need a “unified bean definition”

Managed bean specification
Common bean definition
Instances managed by the container
Common services
Lifecycle callbacks
Resource injections
Interceptors
Foundation spec
How managed beans evolved: http://www.infoq.com/news/2009/11/weld10 JSF EJB CDI JAX-RS Managed Beans

Resource Injection Revisited in JEE 6
Weakest aspect of JEE 5
Closed set of injectable resources
@EJB
@PersistenceContext , @PersistenceUnit
@Resource (e.g., DataSource, UserTransaction)
Name-based injection is fragile
Not “refactor friendly”
Requires special tooling to validate

Context and Dependency Injection (CDI) Web tier (JSF) Transactional tier (EJB)

What CDI provides
Services for Java EE components
Lifecycle management of stateful beans bound to well-defined c ontexts (including conversation context)
Automatic transaction management for web apps!
A type-safe approach to d ependency i njection
Based on Seam 2
Other features …
http://tinyurl.com/weld-reference-101

Injection 101 ... public class ManagedGreeter { @Inject Greeter g ; String message = null; public void setMessage(String m ) { this . message = g .greet( m ); } public String getMessage(){ return message ; } }

Welcome to CDI, EJB 3.1 session beans! @Stateless public class Greeter { public String greet(String name) { return "Hello " + name + "!" ; } }

Welcome to CDI, JSF!
Use the bean directly in the JSF view
<h:outputText value = "#{managedGreeter.message}" />

From JEE 5 to JEE6 CDI JSF managed beans Facelets JSP

Stashing the bean in a context @RequestScoped public class ManagedGreeter { @Inject Greeter g ; String message = null; public void setMessage(String m ) { this . message = g .greet( m ); } public String getMessage(){ return message ; } }

Scope types and contexts
Absence of sc ope - @Dependent
Bound to lifecycle of bean holding reference
Servlet scopes
@ApplicationScoped
@RequestScoped
@SessionScoped
JSF conversation scope - @ConversationScoped
Custom scopes
Define scope type annot ation (e.g., @FlashScoped )
Implement the context API in an extension

Conversation context
Request ≤ Conversation ≪ Session
Boundaries demarcated by application
Optimistic transaction
Conversation-scoped persistence context
No fear of exceptions on lazy fetch operations

Controlling the conversation @ConversationScoped public class BookingAgent { @Inject @BookingDatabase EntityManager em ; @Inject Conversation conversation ; private Hotel selected ; private Booking booking ; public void select(Hotel h) { selected = em .find(Hotel. class , h.getId()); conversation.begin() ; } ...

Controlling the conversation ... public boolean confirm() { if (!isValid()) { return false ; } em .persist( booking ); conversation.end() ; return true ; } }

Container-oriented testing for Java EE
ShrinkWrap
Fluent API for creating Java archives
JavaArchive archive = ShrinkWrap. create ( "archive.jar" , JavaArchive. class ) .addClasses(MyClass. class , MyOtherClass. class ) .addResource( "mystuff.properties" );
Arquillian
Integration test harness
Pluggable container support (embedded or remote)
Supports injection into test class
Tests can be run from IDE or build script

Arquillian Maven integration < dependency > < groupId > org.jboss.arquillian.junit </ groupId > < artifactId > arquillian - junit -container </ artifactId > < version > ${arquillian.version} </ version > < scope > test </ scope > </ dependency >

Arquillian Remote vs. Embedded
Remote
Run on a remote server (localhost or other)
No startup/shutdown
Deployed to running container
Managed
Runs within the JVM
Startup/Shutdown managed by test harness

How do I get started?
Download JBoss AS 7 and Quickstarts
http://jboss.org/jbossas
Generate a project using Eclipse & JBoss Tools
https://www.jboss.org/tools/
View the JBoss Quickstart documentation
https://docs.jboss.org/author/display/
Read the Weld reference guide
http://tinyurl.com/weld-reference-101
Browse the CDI JavaDoc
http://docs.jboss.org/cdi/api/latest/

What is Openshift?
Express
Free shared-hosting
Java, Perl, PHP, Python, and Ruby
Flex
Platform-as-a-Service
Auto-scaling
Performance monitoring
Application Management
Java and PHP

Openshift Express
Register with an email only
Install the RHC command line tools
Create a domain
app-domain.redhat.com
Create an application
rhc-create-app
Copy app into git managed directory
Git push

Try JBoss AS 7 today!
Lighting fast performance
Java EE 6 compliant
Test in the container using Arquallian
Deploy instantly to Openshift

JBoss AS7 OSDC 2011

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JBoss AS7 OSDC 2011 Presentation Transcript