Spring Boot does not resolve View

Question

I'am trying to create a simple controller with Spring Boot Congifuration is:

@Configuration
@EnableWebMvc
@ComponentScan (basePackages = { "ru.spb.chat.controller" })
public class WebConfig implements WebMvcConfigurer {

   @Bean
    public ViewResolver viewResolver() {
       InternalResourceViewResolver bean = new InternalResourceViewResolver();
       bean.setPrefix("/WEB-INF/view/");
       bean.setSuffix(".html");
       return bean;
     }
}

and for servlet:

 public class MainWebAppInitializer implements WebApplicationInitializer {
   @Override
   public void onStartup(final ServletContext sc) throws ServletException {

       AnnotationConfigWebApplicationContext root =
               new AnnotationConfigWebApplicationContext();

       root.scan("ru.spb");
       sc.addListener(new ContextLoaderListener(root));

       ServletRegistration.Dynamic appServlet =
            sc.addServlet("mvc", new DispatcherServlet(new GenericWebApplicationContext()));
       appServlet.setLoadOnStartup(1);
       appServlet.addMapping("/");
    }

}

My controller.

 @Controller
 public class RootController {

    @GetMapping ("/")
    public String root() {
         return "login";
    }
}

But when I try to map on "/" it returns 404-ERROR This is my project-structure:

Answer 1

Remove your WebConfig and remove your ServletInitializer and MainWebAppInitializer . (You can probably also remove the WebSocketConfig and use the auto-configuration from Spring Boot.).

Let your ChatApplication extend SpringBootServletInitializer and implement the configure method.

@SpringBootApplication
public class ChatApplication extends SpringBootServletInitializer {

  public static void main(String[] args) {
    SpringApplication.run(ChatApplication.class, args);
  }

  @Override
  protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    return builder.sources(ChatApplication.class);
  } 

}

Then in your application.properties add

spring.mvc.view.prefix=/WEB-INF/view/
spring.mvc.view.suffix=.html

Now you are using the proper Spring Boot auto-configuration AND proper way of creating a WAR which is executable.

That being said, you generally don't want a WAR (only if you use JSP, which is discouraged with embedded containers).