Spring MVC Framework: What is ContextLoaderListener?

ContextLoaderListener reads the spring configuration file specified using 'contextConfigLocation' in web.xml, parses it and loads the beans defined in that config file to the ApplicationContext.

<servlet>
    <servlet-name>springMVC</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
     
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </init-param>
     
    <load-on-startup>1</load-on-startup>
</servlet>

The ContextLoaderListener has purposes like,

binding the lifecycle of the ApplicationContext with that of lifecycle of the ServletContext.

creates the ApplicationContext and WebApplicationContext.

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