Spring Security - Third Edition

The ContextLoaderListener class

The first step of updating the web.xml file is to remove it and replace it with javax.servlet.ServletContainerInitializer, which is the preferred approach to Servlet 3.0+ initialization. Spring MVC provides the o.s.w.WebApplicationInitializer interface, which leverages this mechanism. In Spring MVC, the preferred approach is to extend o.s.w.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer. The WebApplicationInitializer class is polymorphically o.s.w.context.AbstractContextLoaderInitializer and uses the abstract createRootApplicationContext() method to create a root ApplicationContext, then delegates it to ContextLoaderListener, which is registered in the ServletContext instance, as shown ...