spring mvc no xml 配置404错误

Question

I am trying to develop a simple Spring MVC with no XML application.its basically show a simple home page. I am using tomcat on JetBrains IDE for development and problem is that when I run it on tomcat I see 404 error this is url http://localhost:8080/MySpringSecurityApp_war/

this is a controller

@Component
public class DemoController {
    @GetMapping("/")
    public String showHome(){
        return "home";
    }
}

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.luv2code.springsecurity.demo")
public class DemoAppConfig  {
    //define a bean for view resolver
    @Bean
   public ViewResolver viewResolver(){
      InternalResourceViewResolver viewResolver=new InternalResourceViewResolver();
      viewResolver.setPrefix("/WEB-INF/view/");
      viewResolver.setSuffix(".jsp");
      return  viewResolver;
    }
}

public class MySpringMvcDispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] {DemoAppConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

this is error log

9-Jun-2020 13:32:07.511 WARNING [http-nio-8080-exec-1] org.springframework.web.servlet.PageNotFound.noHandlerFound No mapping found for HTTP request with URI [/MySpringSecurityApp_war/] in DispatcherServlet with name 'dispatcher'
09-Jun-2020 13:32:07.604 WARNING [http-nio-8080-exec-4] org.springframework.web.servlet.PageNotFound.noHandlerFound No mapping found for HTTP request with URI [/MySpringSecurityApp_war/] in DispatcherServlet with name 'dispatcher'

this is also how my project structure

Answer 1

You need to define a resource path if you adding something into your URL (after host part basically in your case MySpringSecurityApp_war ) you are calling localhost:8080/MySpringSecurityApp_war/ but you didn't define the resource path anywhere so I guess what you need to do is either add @RequestMapping("/MySpringSecurityApp_war/") at class level or just call localhost:8080/ without any resource path You can also use @RestController in place of @Component .

I hope it will work.