1. Seminarium on Component-based Software Engineering
JavaBeans
David Snuijf

2. Java Released in alpha-form in 1995 by Sun
Originality: concepts of applets
Java became common used by 1996
20/04/2019
Seminarium CBSE

3. Java – components Java component models: Applet JavaBeans
Enterprise JavaBeans
Servlets
Application client components
J2SE
J2EE
J2SE: Java 2 platform, Standard Edition J2EE: Java 2 platform, Enterprise Edition
20/04/2019
Seminarium CBSE

4. Let’s get into
avaBeans J
20/04/2019
Seminarium CBSE

5. JavaBeans – solution to..
Enables software developers to design and create reusable pieces of software that easily integrate
with each other
with applications
with development tools
20/04/2019
Seminarium CBSE

6. JavaBeans – Main aspects
Events
Properties
Introspection
Customization
Persistence
20/04/2019
Seminarium CBSE

7. JavaBeans Approach to composition: Beans define:
Connection-oriented programming / wiring
Beans define:
Event sources
Event listeners
By connecting one bean instance’s listener to another bean instance’s event source, events flow
container structures
InfoBus
20/04/2019
Seminarium CBSE

8. Let’s get into
nterprise JavaBeans E
20/04/2019
Seminarium CBSE

9. Enterprise JavaBeans (EJB)
Provide a framework for components that may be "plugged in" to a server
Enterprise JavaBeans is totally different of JavaBeans, except that it uses some similar concepts
20/04/2019
Seminarium CBSE

10. Enterprise JavaBeans – Goals
Easy for developers to create applications
Standard way for client/server applications
Compatible with and uses other Java APIs
EJB can interoperate with non-Java apps
EJB is compatible with CORBA
20/04/2019
Seminarium CBSE

11. Enterprise JavaBean component
Client
EJB Home stub
EJB Object stub
Home
Remote or local
EJB Server
EJB Container
EJB Home
EJB Object
EJB Bean
20/04/2019
Seminarium CBSE

12. Kind of Enterprise JavaBeans
Four kind of EJB beans
Stateless session
Stateful session
Entity
Message-driven
20/04/2019
Seminarium CBSE

13. Questions? ?
20/04/2019
Seminarium CBSE

14. 20/04/2019
Seminarium CBSE