The document discusses Enterprise JavaBeans (EJB) and Java Server Pages (JSP). It defines EJB as the server-side component architecture for Java EE that enables development of distributed, transactional, secure applications. EJB components include home interfaces, remote interfaces, and bean classes. JSP is a technology that simplifies development of dynamic web sites, allowing HTML pages to contain embedded Java code. JSP pages are executed by first being translated to servlets, then handled by the web server.

1. 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
SERVELT
S/JSP
EJB JDB20 DATA
JTS/JTA JNDR
JAVAMA
IL
RMI-
IICP
JMS
CLIENT
SERVELT
S/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
CLIENT
INTER
NET
WEB
SERVE
R
DATA
BASE
Client
request
web server
Html
sent to
client
HTML

12. JSP EXECUTION PROCEDURE
System JSP
JSP
translator
serve
JSP
translator
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.