Prev Next

Java / JDK, JRE, JVM, JIT

Difference between EAR, JAR and WAR file in J2EE.

J2EE defines three types of archives.

  • Java Archive (JAR) A JAR file encapsulates one or more Java classes, a manifest, and a descriptor. JAR files are the lowest level of archive. JAR files are used in J2EE for packaging EJBs and client-side Java Applications.
  • Web Archive (WAR) A WAR files are similar to JAR files, except that they are specifically for web applications made from Servlets, JSPs, and supporting classes. Struts and Spring based Web applications may be archived to a WAR.
  • Enterprise Archive (EAR) An EAR file contains all of the components that make up a particular J2EE application. A EAR may contain one or more WAR files. EAR files can also contain connector modules packaged as RAR files and Client modules packaged as JAR files.

More Related questions...

Architectural-neutral. What is High level language? What is Java? Three flavors of Java. Difference between JDK, JRE and JVM. Interpreted. Features of Java. (or) Java buzzwords. Java is object oriented. Is Java a WORA? Java is Simple. Java is Platform independent. How many types of memory areas are allocated by JVM? What is the latest version of Java? What is Write Once, Run Anywhere (WORA)? What is a Platform? Is Java a pure/fully object oriented language? Secured. What is bytecode? Portable. Robust. Dynamic. High-performance. Multithreaded. Distributed. What is classloader? Types of classloader. What is Heap space in Java? Default heap size in Java. What is Java Memory Model? What are the new features introduced in Java 8? Difference between EAR, JAR and WAR file in J2EE. Explain memory leak in Java. How Garbage collection works in Java? What are the GC roots in Java? Types of memory leaks in Java. How do you diagonise memory leaks in Java? Difference between Stack and Heap memory in Java. Does Java garbage collector cleans both heap and stack memory? Why garbage collection is required in Java? How GC does not affect Java program's performance? Different categories of GC algorithm. List the available GC algorithms in Java. What is the default GC collector in Java 8? What are types of reference in Java? Explain strong reference type in Java. Explain weak reference type in Java. Explain Serial Garbage Collector in Java. Explain Parallel Garbage Collector in Java. Explain CMS Garbage Collector in Java. Explain G1 Garbage Collector in Java. What is soft reference in Java? What is phantom reference in Java? Explain the javap command in Java. What is PermGen in Java? What is metaspace in JDK 1.8? Explain the usage of MetaspaceSize parameter in Java 8. Difference between permgen and metaspace in Java. New features introduced in Java 1.7. How do I load Jars dynamically at runtime? What is synthetic construct in Java? New changes introduced in Java 9. What is jshell tool in Java 9? Difference between Java.exe and Javaw.exe. What is Nashorn in Java8? How do I debug to see when class is loaded in jvm? Mention Java features designed to improve application security. Mention few security Libraries that Java platform supports. Mention few advanced coding concepts in Java for security considerations.
Show more question and Answers...

Java Identifiers

Comments & Discussions

Interviews Questions

About Javapedia.net

Javapedia.net is for Java and J2EE developers, technologist and college students who prepare of interview. Also this site includes many practical examples.

This site is developed using J2EE technologies by Steve Antony, a senior Developer/lead at one of the logistics based company.

Follow Javapedia updates

contact: javatutorials2016[at]gmail[dot]com

Kindly consider donating for maintaining this website. Thanks.

Copyright © 2026, javapedia.net, all rights reserved. · .

DMCA.com Protection Status