Basic terminologies for a developer

Basic terminologies for a developer

• 1.
  Basic terminologies inJava 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 : Quizwebsite Time : 15 mins Completion : Not mandatory