How to Configure web.xml Deployment Descriptor: Version-specific Examples

The web.xml is a configuration file to describe how a web application should be deployed. Here’re 5 `up to date` web.xml examples version wise, just for self-reference.

Understand web modules in web xml java

Web Module Structure

In the Java EE architecture, a web module is the smallest deployable and usable unit of web resources. A web module contains web components and static web content files, such as images, which are called web resources. A Java EE web module corresponds to a web application as defined in the Java Servlet specification.

In addition to web components and web resources, a web module can contain other files:

• Server-side utility classes, such as shopping carts
• Client-side classes, such as applets and utility classes

The document root contains a subdirectory named WEB-INF, which can contain the following files and directories:

• classes: A directory that contains server-side classes: servlets, enterprise bean class files, utility classes, and JavaBeans components
• lib: A directory that contains JAR files that contain enterprise beans, and JAR archives of libraries called by server-side classes
• Deployment descriptors, such as web.xml (the web application deployment descriptor) and ejb-jar.xml (an EJB deployment descriptor)

A web module needs a web.xml file if it uses JavaServer Faces (JSF) technology, if it must specify certain kinds of security information, or if you want to override information specified by web component annotations.

 Servlet 2.4 Web Application 

  
Servlet 2.3 Web Application 

Please comment your doubts if any!

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