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Sunday, January 16, 2011

Java Enterprise Edition (J2EE) at a Glance

  1. Java EE application - may contain one or more Java EE components(EJBs, Web modules, resource adapters, or client modules).
  2. Java EE component - can associated deployment descriptor(XML file).
  3. JAR (Java Archive) - ZIP file format and contains Java/Library class files, XML descriptor files, Resource files, static HTML files, Property files.
  4. Java Web application is deployed in a Web Application Archive (WAR) file (.war).
  5. WAR (Web Archive) - contains JAR files (lib), Java class files(classes), servlets, JSP, HTML, JS, CSS and image files , deployment descriptors (web.xml) and other configuration XML files.
  6. A WAR files can be deployed to a Java web server such as Apache Tomcat and it is also called as Web Module.
  7. Java EE application is deployed in an Enterprise Application Archive (EAR) file (.ear).
  8. EAR (Enterprise ARchive) - contains WAR files, JAR files, EJBs, Application deployment descriptor (application.xml) and other configuration XML files.
  9. An EAR file can be deployed to a Java EE application server such as Apache Geronimo, JBoss, WebLogic, or WebSphere.



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