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J2EE Tutorial( Day-1 )

authored by

Biswabrata Banerjee

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Introduction to

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area of Interest J2EE

What we are going to learn in this session(1) ?

- The J2EE technology components

- J2EE architecture overview

- J2EE containers

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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 ofcomponents: Servlets, JSP pages and EJBs.

The service technologies:

Used to provide the application components withsupported services to function efficiently.

The communication technologies:

Used to communicate among the different parts ofthe application ,whether they are local or remote.

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With any application, the most important element is modeling thenecessary business logic through components or application level reusable units.The J2EE platform provides the following technologies for developingcomponents:

WEB Components:

Servlets :-server-side programs that allow application logic tobe 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.

COMPONENT TECHNOLOGIES

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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 directoryJava 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

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Java Connector Architecture (JCA):Using for a variety of legacy application

Java Authentication and Authorization Services (JAAS):Used for providing a means to grant permissionsbased on who is executing the code.

Java Mail:Used for sending and receiving electronic mail

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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).

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J2EE architecture

database

BrowserApplet container

app. clientcontainer

Client Machine

Web container

EJB container

servletJSP page

Enterprise Bean

J2EE server

J2EE Server and Containers

app. client

Continue

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Q. What is a container anyway ?!

A: A J2EE container is a runtime to manage application components developedaccording 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

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Next classJSP and MVC