Execute business logic
Retrieve data according to query parameters
Authenticate and authorize users
Exchange data with legacy systems
Build the HTML response page dynamically to be passed back to the serverA web application has an accompanying configuration called web.xml. This file contains all the configuration information of the application that web container needs to know in order to deploy and run the application properly. Understanding the web.xml file is important since you are going to have to construct web.xml file as a part of development of your web application. A web application is defined as a series of directories and files in a standard layout. Such a hierarchy can be accessed in its unpacked form, where each directory and file exists in the file system separately, or in a packed form known as a Web Application Archive or WAR file. The former format is more useful during development while the latter is used when you distribute your application to the target platform.
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