What is formBackingObject?

Form Backing Object/Command Object This is a POJO that is used to collect all information on a form. It contains data only. It is also called a Command Object in some Spring tutorials. For example, an add a new car form page will have a Car form backing object with attribute data such as Year, Make and Model.

Which controller auto populate a form bean from the request?

Class AbstractFormController. Form controller that auto-populates a form bean from the request.

What is the default name for form backing object in Simpleformcontroller?

The default implementation calls onSubmit(Object) , using the returned ModelAndView if actually implemented in a subclass. Else, the default behavior will apply: rendering the success view with the command and Errors instance as model.

How does Spring BindingResult work?

BindingResult holds the result of a validation and binding and contains errors that may have occurred. The BindingResult must come right after the model object that is validated or else Spring fails to validate the object and throws an exception.

What is ModelAttribute in Spring MVC?

@ModelAttribute is a Spring-MVC specific annotation used for preparing the model data. It is also used to define the command object that would be bound with the HTTP request data. The annotation works only if the class is a Controller class (i.e. annotated with @Controller). Advertisements.

What happens when there is no LocaleResolver defined in the BeanFactory?

Initialize the LocaleResolver used by this class. If no bean is defined with the given name in the BeanFactory for this namespace, we default to AcceptHeaderLocaleResolver.

What configuration is supported by the Localsessionfactorybean?

Configuration settings can either be read from a Hibernate XML file, specified as “configLocation”, or completely via this class. A typical local configuration consists of one or more “mappingResources”, various “hibernateProperties” (not strictly necessary), and a “dataSource” that the SessionFactory should use.

How does Spring boot handle validation errors?

How should validations be handled?

  1. Provide a clear message indicating what went wrong. Tell the user what was wrong in the input.
  2. Send back proper response code. Usually in case of validation errors, we use HTTP Status 400 (BAD_REQUEST).
  3. Don’t send sensitive information back in the response.

What is a BindingResult?

[ BindingResult ] is Spring’s object that holds the result of the validation and binding and contains errors that may have occurred. The BindingResult must come right after the model object that is validated or else Spring will fail to validate the object and throw an exception.

What is @valid in Spring boot?

When Spring Boot finds an argument annotated with @Valid, it automatically bootstraps the default JSR 380 implementation — Hibernate Validator — and validates the argument. When the target argument fails to pass the validation, Spring Boot throws a MethodArgumentNotValidException exception.