1. J2EE Tutorial
( Day-1 )
authored by
Biswabrata Banerjee

2. Introduction to

3. ...few words about JAVA
Over the last few years, the Java language has been significantly improved. While
the core architecture of Java remained the same, the language has been enhanced in
terms of security, usability of APIs, etc. Today, there are three major editions of Java
technologies, as follows:
1. Java 2 Standard Edition (J2SE): Also referred to as Java Development Kit
(JDK). J2SE is a software development kit that includes a set of APIs, tools, and
a runtime for developing general-purpose applications.
2. Java 2 Enterprise Edition (J2EE): J2EE is the basis for Java-based enterprise
applications . J2EE specifies a standard for developing multi-tier distributed
component-based applications. J2EE provides an integrated technical framework
for developing Internet-enabled enterprise, and e-commerce applications.
3. Java 2 Micro Edition (J2ME): J2ME provides a lightweight and optimized
Java environment for applications and consumer and mobile devices.

4. area of Interest J2EE
What we are going to learn in this session(1) ?
- The J2EE technology components
- J2EE architecture overview
- J2EE containers

5. About J2EE Technology
J2EE is essentially a specification that stipulates how the various
J2EE technologies work together . According to use, The collection of J2EE
technologies can be divided into the following three :
The component technologies:
Used to hold business logic. There are three type of
components: Servlets, JSP pages and EJBs.
The service technologies:
Used to provide the application components with
supported services to function efficiently.
The communication technologies:
Used to communicate among the different parts of
the application ,whether they are local or remote.

6. COMPONENT TECHNOLOGIES
With any application, the most important element is modeling the
necessary business logic through components or application level reusable units.
The J2EE platform provides the following technologies for developing
components:
WEB Components:
Servlets :
-server-side programs that allow application logic to
be embedded in HTTP request-response process.
-enable dynamic content in HTML,XML.
Java Server Pages (JSP Pages):
-Text-based documents that separates the application
logic from presentation logic.
Enterprise Java Bean Components(EJBs):
Used for developing distributed components.

7. SERVICE TECHNOLOGIES
J2EE is essentially a specification that stipulates how the various
J2EE technologies work together. J2EE service technologies include:
Java Naming and Directory Interface (JNDI):
Used for naming and directory
Java Message Service (JMS):
Used for asynchronous messaging
Java Transaction API (JTA):
Used for distributed transactions
Java Database Connectivity (JDBC) :
Used for enterprise-level database access
Java API for XML Parsing (JAXP):
Used for parsing XML documents

8. Java Connector Architecture (JCA):
Using for a variety of legacy application
Java Authentication and Authorization Services (JAAS):
Used for providing a means to grant permissions
based on who is executing the code.
Java Mail:
Used for sending and receiving electronic mail

9. COMMUNICATION TECHNOLOGIES
This group holds those technologies that ‘glue’ together the
application and let the various components and services to communicate
with each-other .It includes : Internet Protocols ( HTTP,TCP/IP, SSL) ,
Remote Object protocols (RMI, RMI-IIOP).

10. J2EE architecture
J2EE Server and Containers
J2EE server
Browser
Applet container
JSP page servlet
Web container database
app. client
app. client Enterprise Bean
container
Client Machine EJB container
Continue…

11. Q. What is a container anyway ?!
A: A J2EE container is a runtime to manage application components developed
according to the API specification and to provide access to the J2EE APIs.
The container architecture shown in the previous slide has four containers:
A web container for hosting Java servlets and JSP pages.
A EJB container for hosting Enterprise Java Bean Components.
An applet container for hosting java applets.
An Application client container for hosting standard Java application

12. Next class
JSP and MVC