EJB & JSP

1. EJB AND JSP
Submitted by,
D.SHANMUGAPRIYA
I-MSC(IT)
NADAR SARASWATHI COLLEGE OF ARTS
AND SCIENCE

2. CONTENTS OF EJB
 Introduction
 What is the difference between web server &
Application server
 Java enterprise edition on APIs
 Elements of EJB components
 Accessed by the EJB components
 EJB Architecture

3. INTRODUCTION
 Is the server side component architecture for java
platform , enterprise edition(Java EE)
 EJB technology enables rapid and simplified
development of distributed , transactional , secure
& portable applications based on java technology.
 Presented by sun in the 1999,which EJB
application runs in a J2E server or Application
server.

4. DIFFERENCE BETWEEN WEB SERVER
& APPLICATION SERVER
 A web server contains only a web container but an
application server contains both a web container
and a EJB container.
 A web server does not follows clustering but an
application server follows clustering.

5. JAVA ENTERPRISE EDITION ON API’s
CLIENT
SERVEL
TS/JSP
EJB JDB20 DATA
JTS/JTA JNDR
JAVAM
AIL
RMI-
IICP
JMS
CLIENT
SERVEL
TS/JSP
EJB JDB20 DATA

6. ACCESSED BY THE EJB COMPONENTS
 EJB components runs inside a server and it can
be accessible by the following types of clients.
 A desktop application can access EJB.
 An applet can access EJB.
 A web client using serve or JSP can access EJB
 One EJB can access another EJB.
 A CORBA client can access EJB.

7. ELEMENTS OF EJB COMPONENTS
 Home interface
 Remote interface
 Bean class
 1.HOME INTERFACE:-Home interface is a factory
for creating EJB objects.
 The home interface contains life cycle methods like
create() , remove() , find xxx() ,etc.
 Each method in home interface returns the remote
object . Or EJB object.

8. Cont..
 2.REMOTE INTERFACE:-It contains logic
methods in order to create a remote interface
our interface must be extend EJB object
interface.
 Remote interface is given in JAVAX .
ejb.*;package.
 3.BEAN CLASS:-The Bean Class contains both
life cycle methods implementation + business
logic methods give in home interface &
remote interface and also it contains
container call back methods.

9. EJB ARCHITECTURE
H
R
client
NAMING SERVICE
HOME
OBJ
EJB
OBJ
BEAN
OBJECT
R
CLIENT
EJB
SERVER

10. JSP
INTRODUCTION
 Java server pages or as in normally called JSP is a
java based technology that simplifies the
developing of dynamic web sites
 It is a technology developed sun micro system
back in 1999.
 JSP pages are HTML pages with embedded code
that allows to access data form java code running
on the server.
 JSP contains an extension on of . JSP

11. JSPARCHITECTURE
CLIEN
T
INTER
NET
WEB
SERV
ER
DATA
BASE
Client
request
web
server
Html
sent to
client
HTML

12. JSP EXECUTION PROCEDURE
Syste
m
JSP
JSP
translator
serve
JSP
translato
r
buffer
Server
object
JRE

13. JSP LIFE-CYCLE
Java server page
JSPLNIT () (LOAD
PROCESS)
JSP SERVICES ()
(ACCEPT
REQUEST)
JSP DESTROY ()
(UNLOAD
RESOURCES)
REQUEST
RESPONS
E

14. ADVANTAGE
 Used need not write HTML and java code
separately.
 JSP can be used for both front end and for writing
business logic.
 JSP is dynamic compilation which means when a
JSP is modified.
 JSP IS EFFICIENT:-every request for a JSP is
handled by a simple java method.
 JSP IS SCALABLE:-easy integration with other
backend services.

15. DISADVANTAGE
 As JSP pages are translated to serve and
complied.
 It is difficult to trace errors occurred in JSP
pages.
 JSP pages require double the disk space to hold
the JSP page.