404 error redirect in Spring with java config

Question

As you know, in XML, the way to configure this is:

    404
    /my-custom-page-not-fo         


        

Answer 1

In your web configuration class,

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter 

Declare a bean as follows,

@Bean
public EmbeddedServletContainerCustomizer containerCustomizer() {

  return new EmbeddedServletContainerCustomizer() {
    @Override
    public void customize(ConfigurableEmbeddedServletContainer container)       
    {
      ErrorPage error401Page = new ErrorPage(HttpStatus.UNAUTHORIZED, "/401.html");
      ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/404.html");
      ErrorPage error500Page = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/500.html");

      container.addErrorPages(error401Page,error404Page,error500Page);
    }
  };
}

Add the mentioned html files(401.html .etc) to /src/main/resources/static/ folder.

Hope this helps