04.Server - Extra Note

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What is the difference between a Java EE Web Profile certified server (like JOnAS) and a Java EE Full Platform certified server (like JBoss AS)?

Here is nice image which explains it. Web profile is a subset of Java EE and it's purpose is to allow developers to create more lightweight applications which can be used inside simple servlet container (like Tomcat or Jetty).


In J2EE application, modules are packaged as EAR, JAR, and WAR based on their functionality

JAR: EJB modules which contain enterprise java beans (class files) and EJB deployment descriptor are packed as JAR files with .jar extension.JAR file only requires a Java installation.

WAR: Web modules which contain Servlet class files, JSP Files, supporting files, GIF and HTML files are packaged as a JAR file with .war (web archive) extension.need Java EE Web Profile - compliant application server.

EAR: All the above files (.jar and .war) are packaged as a JAR file with .ear (enterprise archive) extension and deployed into Application Server.Need Java EE Full Platform - compliant application server. must have an application.xml file contained within a folder named META-INF. Only requires a web.xml file contained within a WEB-INF folder.


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