How do you declare a custom error page in Spring?

How do you declare a custom error page in Spring?

Let’s start with the simple steps we’re going to follow here:

1. Specify a single URL /errors in web.
2. Create a Controller called ErrorController with a mapping /errors.
3. Figure out the HTTP error code at runtime and display a message according to the HTTP error code.

How do I handle the WhiteLabel error page?

Another way of disabling the WhiteLabel Error is excluding the ErrorMvcAutoConfiguration . Alternatively, the exclusion can be done in an annotation. When the WhiteLabel Error Page is disabled and no custom error page is provided, the web server’s error page (Tomcat, Jetty) is shown.

How does Spring rest handle 404 error?

Let’s try and execute a simple response.

1. Step 1: Open Rest client Postman and select the Get method.
2. Step 2: Click on the History tab and choose the Get request.
3. Step 3: Type the URI http://localhost:8080/users/{id}.
4. Step 4: Click on the Send Button.
5. Step 1: Open the UserResource.
6. Step 2: Create a UserNotFoundException.

What is the difference between ControllerAdvice and RestControllerAdvice?

The differences between @RestControllerAdvice and @ControllerAdvice is : @RestControllerAdvice = @ControllerAdvice + @ResponseBody . – we can use in REST web services. @ControllerAdvice – We can use in both MVC and Rest web services, need to provide the ResponseBody if we use this in Rest web services.

What is the use of @RestControllerAdvice?

The @RestControllerAdvice annotation is specialization of @Component annotation so that it is auto-detected via classpath scanning. It is a kind of interceptor that surrounds the logic in our Controllers and allows us to apply some common logic to them.

What is @ControllerAdvice in spring boot?

@ControllerAdvice is a specialization of the @Component annotation which allows to handle exceptions across the whole application in one global handling component. It can be viewed as an interceptor of exceptions thrown by methods annotated with @RequestMapping and similar.

What is whitelabel error page?

Whitelabel Error Page is a generic Spring Boot error page which is displayed when no custom error page is found. Set “server.error.whitelabel.enabled=false” to switch of the default error page.

What is spring boot ErrorPageFilter?

Class ErrorPageFilter It registers error pages and handles application errors by filtering requests and forwarding to the error pages instead of letting the server handle them. Error pages are a feature of the servlet spec but there is no Java API for registering them in the spec.

What is 404 error in Spring boot?

As with any web application or website, Spring MVC returns the HTTP 404 response code when the requested resource can’t be found.

Why is @ControllerAdvice used?

@ControllerAdvice is an annotation provided by Spring allowing you to write global code that can be applied to a wide range of controllers — varying from all controllers to a chosen package or even a specific annotation.

What is ErrorMvcAutoConfiguration?

Class ErrorMvcAutoConfiguration Auto-configuration to render errors via an MVC error controller.

How do I create a custom error page for when Tomcat is down for maintenance?

All we need to do is add an ErrorDocument entry to our http. conf file. On the ErrorDocument line, we specify the error code, which in this case is a 503. After that, we can specify either a text message or the page to display.

What is white label error?

What is @ComponentScan?

The @ComponentScan annotation is used with the @Configuration annotation to tell Spring the packages to scan for annotated components. @ComponentScan also used to specify base packages and base package classes using thebasePackageClasses or basePackages attributes of @ComponentScan.

How do I return rest errors?

The most basic way of returning an error message from a REST API is to use the @ResponseStatus annotation. We can add the error message in the annotation’s reason field. Although we can only return a generic error message, we can specify exception-specific error messages.

What are API errors?

The server responds to an API request with a success code indicating the action is completed successfully. However, sometimes there may be no response or an error response. This indicates that the request has failed, and the action is not completed. In such cases, you may receive an API error message in CORE.