Spring Security 1: First Application

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DemoController:

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@Controller
public class DemoController {
    // This is the index of application
    @GetMapping("/")
    public String showHome() {
        return "home";
    }
}

LoginController:

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@Controller
public class LoginController {
    // Due to the DemoSecurityConfig, 
    // before we accessing the index page, we have to login
    @GetMapping("/showMyLoginPage")
    public String showMyLoginPage() {
        return "fancy-login";
    }
}

login.jsp:

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<c:if test="${param.error != null}">
	<div>
		Invalid username and password.
	</div>
</c:if>

In Spring Security system, if the log in step fails, there will be a param error in the link, like:http://localhost:8080/showMyLoginPage?error. So jstl can be used to check if the log in fails and show different pages.