Difference between jar and war in Java

Question

What is the difference between a  jar and a  war file  Is it only the file extension or is there something more

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You add web components to a J2EE application in a package called a web application archive (WAR), which is a JAR similar to the package used for Java class libraries. A WAR usually contains other resources besides web components, including:

Server-side utility classes (database beans, shopping carts, and so on).

Static web resources (HTML, image, and sound files, and so on)

Client-side classes (applets and utility classes)

A WAR has a specific hierarchical directory structure. The top-level directory of a WAR is the document root of the application. The document root is where JSP pages, client-side classes and archives, and static web resources are stored.

(source)

So a .war is a .jar, but it contains web application components and is laid out according to a specific structure. A .war is designed to be deployed to a web application server such as Tomcat or Jetty or a Java EE server such as JBoss or Glassfish.

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A war file is a special jar file that is used to package a web application to make it easy to deploy it on an application server  The content of the war file must follow a defined structure

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Jar - jar contain only  class war - war contain html  js  css and  class also jsp and servlets pages

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WAR stands for Web application ARchive  JAR stands for Java ARchive

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Basicly both compressed archives  war is used for web application with a specific directory structure

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jar and  war are both zipped archived files  Both can have the optional META-INF MANIFEST MF manifest file which hold informative information like versioning  and instructional attributes like classpath and main-class for the JVM that will execute it    war file - Web Application Archive intended to be execute inside a  Servlet Container  and may include other jar files  at WEB-INF lib directory  compiled classes  at WEB-INF classes  servlet goes there too    jsp files images  files etc   All WAR content that is there in order to create a self-contained module

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A  war file is a Web Application Archive which runs inside an application server while a  jar is Java Application Archive that runs a desktop application on a user s machine

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A  war file has a specific structure in terms of where certain files will be  Other than that  yes  it s just a  jar

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A JAR file extension is  jar and is created with jar command from command prompt  like javac command is executed   Generally  a JAR file contains Java related resources like libraries  classes etc JAR file is like winzip file except that Jar files are platform independent   A WAR file is simply a JAR file but contains only Web related Java files like Servlets  JSP  HTML   To execute a WAR file  a Web server or Web container is required  for example  Tomcat or Weblogic or Websphere  To execute a JAR file  simple JDK is enough

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From Java Tips  Difference between ear jar and war files      These files are simply zipped files   using the java jar tool  These files are   created for different purposes  Here   is the description of these files           jar files  The  jar files contain   libraries  resources and   accessories files like property files     war files   The war file contains   the web application that can be   deployed on any servlet jsp   container  The  war file contains jsp    html  javascript and other files   necessary for the development of web   applications         Official Sun Oracle descriptions    The J2EETM Tutorial  Web Application Archives The Java Archive  JAR  File Format  The Basics     Wikipedia articles    WAR file format  Sun  JAR file

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JAR files allow to package multiple files in order to use it as a library  plugin  or any kind of application  On the other hand  WAR files are used only for web applications    JAR can be created with any desired structure  In contrast  WAR has a predefined structure with WEB-INF and META-INF directories    A JAR file allows Java Runtime Environment  JRE  to deploy an entire application including the classes and the associated resources in a single request  On the other hand  a WAR file allows testing and deploying a web application easily

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War -      distribute Java-based web applications  A WAR has the same file   structure as a JAR file  which is a single compressed file that   contains multiple files bundled inside it    Jar -     The  jar files contain libraries  resources and accessories files   like property files       WAR files are used to combine JSPs  servlets  Java class files  XML   files  javascript libraries  JAR libraries  static web pages  and any   other resources needed to run the application

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war and jar are archives for java files  war is web archive and they are running on web server  jar is java archive

[java] Difference between jar and war in Java

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