Now we've got a basic idea of how request mapping works. I also mentioned that every web request first comes to the Dispatcher servlet, but the question is how does the Dispatcher servlet know it should handle every incoming request? The answer is we explicitly instructed it to do so through the getServletMappings method of the DispatcherServletInitializer class. Yes, when we return the string array containing only the "/" character, it indicates the DispatcherServlet configuration as the default servlet of the application. So every incoming request will be handled by DispatcherServlet.
Let's observe what will happen when we change the return value of the getServletMappings method.
Open
DispatcherServletInitializerand change the return value of thegetServletMappingsmethod asreturn new String[] { "/app/*"}; basically yourgetServletMappingsmethod should look like the following after your change...