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Java 2 – Enterprise Edition

Java 2 – Enterprise Edition. Kevin J. LaFata April 21, 2003 UM – St. Louis. Overview. J2EE Intro Key Concepts JSP and Servlets XML Building and Deployment EJB More info and job market. Enterprise Java Beans (EJB) JDBC Java Messaging Service Servlets JSP. JNDI Java Mail XML SOAP

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Java 2 – Enterprise Edition

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  1. Java 2 – Enterprise Edition Kevin J. LaFata April 21, 2003 UM – St. Louis

  2. Overview • J2EE Intro • Key Concepts • JSP and Servlets • XML • Building and Deployment • EJB • More info and job market

  3. Enterprise Java Beans (EJB) JDBC Java Messaging Service Servlets JSP JNDI Java Mail XML SOAP JAAS JTA and others… What makes up J2EE

  4. J2EE as a Specification • Specifications • Interfaces • Libraries • Implementations

  5. Key Concepts • XML • Deployment • When & what to use • OO Design • Syntax – less important

  6. JSP • JSP Directives • HTML • Embedded Code • Tag Libraries/Custom Tags • Sessions

  7. JSP Translation • JSP Translated into a servlet • Uses HTTPServlet package • Servlet compiled and executed • Done by Tomcat

  8. Servlets • Special interface • Uses response and request objects • Run by a server such as Tomcat

  9. JSP Example

  10. Servlet Example

  11. XML Importance • Used everywhere in Java • Data standardization • Configuration Files • Deployment File

  12. XML Basics • Special Header • Like HTML • Must be well formed • All tags must be closed • Tags can have data, attributes, other tags • DTDs

  13. XML Example

  14. XSLT • Translates XML to something • Usually HTML • Selection language • Looping, conditionals

  15. ANT • Like a Makefile • Many Java specifics • Defined using XML • Build targets and tasks

  16. ANT Example

  17. Deployment • Jar files – Libraries • War files – Web applications • Ear files – EJB Deployments • Manifests and information along with class files and resources • XML used to define deployment descriptors

  18. Enterprise Java Beans • Specifications • Containers • Adds scalability, thread safety, transactions • Security

  19. Bean Types • Stateless Session Beans • Stateful Session Beans • Entity Beans

  20. Session Beans • Perform actions • Business rules and logic • Can maintain session • Pooled by server

  21. Entity Beans • Represent data or objects • Usually persistent • Underlying data storage • Storage can be handled by bean or by server

  22. Transactions • Atomic – all or nothing • Consistency – data is valid • Isolation – data locking • Durability – data stays permanent

  23. Implementations • JBoss • BEA Weblogic • IBM WebSphere • Oracle Application Server • Jakarta Tomcat

  24. Learn by trying • Tomcat • JBoss • MySQL • Oracle (Development)

  25. For more information • 100’s of books • java.sun.com

  26. Job Market • A.G. Edwards • Anheuser Busch • Enterprise Rent-A-Car • OO Design Important • Side Projects • Additional Skills

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