J2EE Java2 Enterprise Edition by Damian Borth

Contents Introduction Architectures styles Components Scenarios Roles Processing a HTTP request

Java2 Enterprise Edition Java Development Kit (JDK) –Compiler –Debugger –JavaDoc Splitting of the one JDK –J2ME –J2SE –J2EE

Java2 Enterprise Edition J2EE –distributed platform –design, development, assembly, deploy –component oriented Enterprise Application Ontop of the J2SE

Java2 Enterprise Edition Include –J2EE Platform specification –J2EE Application Model –J2EE Compatibility Test Suite

J2EE Architecture N-Tier architecture –Frontend Tier presentation input validation –Middle Tier business logic –EIS Tier RDBMS Directory

J2EE Architecture

J2EE Component Web Container –JSP for dynamic web pages (document oriented) –Servlets point of entry for processing HTTP request (programming oriented)

J2EE Component EJB Container –EJB are components, which provide services via standard interfaces –Benefits Distribution management Persistence management Transaction management Security management

J2EE Component EJB Container –Session Beans provides functionality / service –Entity Beans representation of business data –Message driver Beans responsible for receiving messages via JMS

Defined scenarios Multitier Web Client Scenario Simple Web Client Scenario EJB Application Client Scenario Business-to-Business Scenario

Multitier Web Client Scenario

Simple Web Client Scenario

EJB Application Client Scen.

Business-to-Business Scenario

Defined Roles J2EE specification defines roles Six different roles –J2EE Tool provider –Application Component Provider –Application Assembler –Deployer –System Administrator –Tool Provider

Defined Roles

Processing a HTTP request Using a Model-View-Controller pattern Example: –Read data from database –Form with input boxes –POST method

Processing a HTTP request

Questions?