INTERVIEW QUESTIONS J2EE EJB DETAILS

Question: What is the difference between EAR, JAR and WAR file

Answer: In J2EE application modules are packaged as EAR, JAR and WAR based on their functionality
JAR:
EJB modules which contains enterprise java beans class files and EJB deployment descriptor are packed as JAR files with .jar extenstion
WAR
Web modules which contains Servlet class files,JSP FIles,supporting files, GIF and HTML files are packaged as JAR file with .war( web achive) extension
EAR
All above files(.jar and .war) are packaged as JAR file with .ear ( enterprise archive) extension and deployed into Application Server.

In J2EE application modules are packaged as EAR, JAR and WAR based on their functionality
JAR:
EJB modules which contains enterprise java beans class files and EJB deployment descriptor are packed as JAR files with .jar extenstion
WAR
Web modules which contains Servlet class files,JSP FIles,supporting files, GIF and HTML files are packaged as JAR file with .war( web achive) extension
EAR
All above files(.jar and .war) are packaged as JAR file with .ear ( enterprise archive) extension and deployed into Application Server. Source: CoolInterview.com

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