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What is the use of web.xml and why do we use?
<filter> <filter-name>wicket.mysticpaste</filter-name> <filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class> <init-param> <param-name>applicationClassName</param-name> <param-value>com.mysticcoders.WicketApplication</param-value> </init-param> </filter> <filter-mapping> <filter-name>wicket.mysticpaste</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> What does this filer and filermapping do?
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web. xml defines mappings between URL paths and the servlets that handle requests with those paths. The web server uses this configuration to identify the servlet to handle a given request and call the class method that corresponds to the request method.
xml file is required! When required, however, we can take control over parts of the configuration and override the conventions that Spring Boot puts in play. We can also, if we really must, use traditional XML configuration files for some parts of the configuration.
No, there will be no need of web. xml for servlet based application if you are using servlet version >3.0 and tomcat 7 as it will not run in the previous versions of tomcat. Annotation represents the metadata. If you use annotation, deployment descriptor (web.
Application Configuration Spring MVC web applications use the web. xml file as a deployment descriptor file. Also, it defines mappings between URL paths and the servlets in the web.
Generally speaking, this is the configuration file of web applications in java. It instructs the servlet container (tomcat for ex.) which classes to load, what parameters to set in the context, and how to intercept requests coming from browsers.
There you specify:
In servlet 3.0 many of the web.xml parts are optional. These configurations can be done via annotations (@WebServlet, @WebListener)
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