Deals with the basic terms which must be known to every Java/Web developer. (Hands-on)

1. Basic terminologies in Java and Web Development

2.  JDK and JRE
 What is this PATH variable?
 Servers and Containers
 Eclipse
 Creating a web project using Eclipse – JSP

3.  Java is the language – Library + Platform
◦ Java Card
◦ Micro Edition
◦ Standard Edition
◦ Enterprise Edition
 JDK is the library
◦ The set of classes & tools (javac, java)
 JRE is the platform
◦ VM that executes Java bytecode.
◦ How does the JVM know where the classes are?

4.  Environment variables – Named values that affect
the way running processes behave.
◦ Provides a standard way for accessing commonly used
processes.
◦ Eg: Temp files, Java
 Where could we see the list of all ENV vars?
 CRUD on ENV variables.
 PATH – Specifies a set of directories where
executable programs are located.
◦ Order of search – Current working directory  PATH
variable (left to right)
◦ Sample – Batch script
 %CLASSPATH%

5.  Servers serve the requests from other programs.
 Depending on the computing service
◦ Database server
◦ File server
◦ Mail server
◦ Web server!
◦ Application server

6.  Web server – Deliver webpages on request from
clients. Eg: Apache, IIS, Nginx
 General usage : A web browser / web crawler
initiates communication by making request to a
specific resource, server responds with content of
that resource (HTML Document)
 Features :
◦ Virtual Hosting
◦ Bandwidth Throttling – fair share
◦ Server side scripting

7.  Currently
nginx is in the
second
position.

8.  Modularization!
 An interface between the component and the low-
level-platform specific functionality.
 Eg: Web Container, EJB container
 Web Container (Servlet container)  Web servers
◦ Interacts with the servlets
 Roles of Web Container
◦ Lifecycle of servlets
◦ Mapping a URL to a servlet
◦ Access rights to an URL

9.  Web server (with a web container)
 Difference between apache and apache tomcat.
◦ Apache is C
◦ Tomcat is Java
 Tomcat is configurable – server.xml
 Three Components
◦ Catalina – servlet container
◦ Coyote – HTTP Connector Component
◦ Jasper – JSP Engine (converts JSP files to servlets for Catalina)
 Check Tomcat server startup.
 Latest version in Tomcat 7.0.26

10.  Web Servers + Java EE concepts
 Security, Data Services, Transaction Support,
Persistence Support, Load Balancing etc.
 Eg: WebLogic Oracle, IBM WebShere
 Check JBoss AS

12. Exercise : Quiz website
Time : 15 mins
Completion : Not mandatory