1. Java EE - Introduction -
Pierre-Johan CHARTRE

2. Java Keywords JVM JRE J2SE J2EE JDK Bytecode Object language
Object.class
JVM
Javadoc
JRE
Manifest.MF
ArrayList
Main class
Java
J2SE
J2EE
JAR
Reflection
.class
JDK
UML
Bytecode
debugger

3. J2EE Keywords JCP @EJB JMS JSF Transaction Validation JPA @Stateless
JSR
@MessageDrivenBean
@EJB
container
JMS
@SessionScope
@Converter
@Resource
@TransactionAttribute
J2EE
component
JSF
Renderer
Transaction
@ManagedBean
@Validator
EntityManager
CriteriaBuilder
Validation
@Inject
JPA
NativeQuery
JPQL
@NotNull
@PersistenceContext

4. Java
Java - A technology invented by Sun Microsystem (RIP) and now an Oracle product.
« Write once, run everywhere ».
JVM – Java Virtual Machine. It abstracts your OS and executes the Java byte code.

5. Java
JRE – Java Runtime Environment . Set of tools aims to execute a Java program
The virtual machine
The byte code interpreter and converter into native code
The standard Java API
JDK – Java Standard Development Kit. It’s your toolbox. It allows to write Java source code and compiles it into byte code.
Javac, the java compiler which converts source code (.java) into byte code (.class)
Jar, the java archiver. It archives a set of class files into a jar file
Javadoc, the documentation generator (abuse it!)
Jdb, the java debugger
A JRE

6. Java 2 SE
Java Standard Edition. Contains the basics API. It’s desktop computer oriented.
A set of basics API
Example: Collections

7. Java 2 EE Specifications of standard API Certifications
Different implementation of same API
Example: JPA is implemented by Eclipselink, OpenJPA, Hibernate
Defined by the Java Community Process (JCP)
Certifications
Architecture pattern
Large scale
Multi-tiers (Presentation Logic, Business Logic, Persistence)
Scalable
Reliable
Secure
J2EE = an extension of Java SE to facilitate the development of enterprise applications ?

8. J2EE architecture

9. J2EE servers
‘’Java EE is a set of specifications implemented by different containers. Containers are Java EE runtime environment that provides certain services to the component they host… ’’
Antonio Goncalves, Beginning Java EE 6 Platform with GlassFish 3
J2EE server = Web container + J2EE implementation
Runtime
Web container
J2EE4
certified
J2EE5
J2EE6
Tomcat
Yes
Open EJB
Geronimo = Tomcat + Open EJB
JBoss AS
IBM Websphere AS
Yes >=WAS 8
Glassfish Open source
Oracle Glassfish
Apache TomEE

10. J2EE APIs javax.enterprise.inject.* javax.enterprise.context.*
javax.validation.*
javax.persistence.*
javax.transaction.*
javax.ejb.*
javax.jms.*
javax.resources.*
javax.servlet.*
javax.faces.*
javax.faces.component.*

11. J2EE APIs – The big picture

12. Core J2EE Patterns
= J2EE architecture Design Pattern

13. To sum up J2EE extends J2SE J2EE is multi-tiers/layered
J2EE is a set of specifications, not a set of implementations
J2EE server = container + J2EE implementations
A J2EE server host J2EE applications