Introduction to Java 2 Enterprise Edition

Introduction to Java 2 Enterprise Edition • About myself – Neutrinos, Cancer Research, IT Applications • Today’s topic: J2EE – – – – Context Advantages Components Architecture • Lecture method – Informal, Interactive Context of J2EE • Role of J2EE in IT Applications • Brief History – Role of Java in IT • Role of Telecommunications • Comparison with other technologies – .NET Advantages • Standard architecture, – greater choices in tools, servers, etc • Scalability – Distributed computing • Developer productivity – Object Oriented language • Run-time configurability Advantages (continued) • Portability – Works on many platforms • Access to existing systems – JDBC, JNDI, JNI, Connectors • Flexibility in security, transactions, etc. Common Components of J2EE 1.3  HTTP 1.0 and HTTPS (HTTP 1.0 over SSL 3.0) – Existed before, is a Prerequisite  JavaServer Pages 1.2 and Servlet 2.3 API – Add dynamism to the web  EJB 2.0, Enterprise JavaBeans – Allow partitioning into tiers Connection APIs • JDBC 2.0 – Database operations • JNDI 1.2, Java Naming and Directory Interface – Locating resources • JCA 1.0, J2EE Connector Architecture – Access to enterprises applications like ERP • JavaIDL, – Java 2 access to CORBA services • JTA 1.0.1 and JTS, Java Transaction API and Service Web Services • JAXP 1.1, Java API for XML Processing • JAX-RPC, Java API for XML-based RPC • JAXR, Java API for XML Registries • JAXB, Java Architecture for XML Binding • JAXM, Java API for XML Messaging Other Services • JAAS 1.0, Java Authentication and Authorization Service • JavaMail 1.2 and JAF 1.0 • Java RMI • JMS 1.0.2, Java Message Service for asynchronous exchanges MVC Architecture • Model – Application Data and Business Rules • View – Rendering of model contents • Controller – Translate user input to model actions MVC Actions • Model – Notify view about data updates • View – Change rendering as needed • Controller – Select view to be rendered • Based on event notifications and method invocations