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<web-app id="WebApp_ID" version="3.1"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_3_1.xsd">
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
</web-app>
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After adding the web-app tag with schema, if you face any issue in your eclipse like "Download from external resource is disabled", you can enable it by Go to top bar: Window → Preferences → Maven → Check the option ("Download Artifact javadoc"). Then apply and close.
What did you just do? First, you specified a servlet that Tomcat should know (the 'servlet' section). You named the servlet 'dispatcher' and you told Tomcat that you wanted it to be of type 'org.springframework.web.servlet.DispatcherServlet'. You also told Tomcat to initialize the dispatcher servlet with a file named servlet-context.xml located in WEB-INF > spring > appServlet.
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