EAR - enterprise archive - it consists of application.xml (META-INF folder) which is the deployment descriptor, it is used to pack and deploy WAR and EJB in to web application servers
WAR - it consists of servlet (front controller) + JSPs + Business Delegate Classes + Web.xml + Anxillary jars (WEB-INF/lib folder)
EJB - it consists of web service clients + MDBs + Data base logic + session beans + JPA + DAOs
ANT + Maven - can be used to build ear files
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