Open your STS and run the webstore project; just right-click on your project and choose Run As | Run on Server. You will be able to view the same welcome message on the browser.

Now, go to the address bar of the browser and enter the URL, http://localhost:8080/webstore/welcome.

You will see the HTTP Status 404 error page on the browser, and you will also see the following warning in the console:

WARNING: No mapping found for HTTP request with URI [/webstore/welcome] in DispatcherServlet with name ' DefaultServlet'

An error log displaying the "No mapping found" warning message

Now, open the HomeController class, change the @RequestMapping annotation's value attribute to /welcome, and save it. Basically, your new request mapping annotation will look like @RequestMapping("/welcome").

Again, run the application and enter...