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Spring MVC Tutorials 17 - Form Validations 01 ( using JSR 303/349 provided annotations ) Video Lecture | MVC Tutorials: Web Programming Course - Web Development
FAQs on Spring MVC Tutorials 17 - Form Validations 01 ( using JSR 303/349 provided annotations ) Video Lecture - MVC Tutorials: Web Programming Course - Web Development
| 1. What is JSR 303/349? |  |
Ans. JSR 303/349 refers to the Java Specification Request that defines the Bean Validation API, which provides a standard way to validate Java beans. It allows developers to apply validation rules to properties of a bean using annotations.
| 2. How can I enable form validations in a Spring MVC application? | |
Ans. To enable form validations in a Spring MVC application, you need to perform the following steps:
1. Add the necessary dependencies for JSR 303/349 validation in your project.
2. Annotate the properties of your form backing bean with validation annotations such as @NotNull, @Size, etc.
3. In the controller, add the @Valid annotation before the form backing bean parameter to enable the validation.
4. Use the BindingResult object to handle any validation errors and redirect the user back to the form if there are errors.
| 3. Can I create custom validation annotations using JSR 303/349? | |
Ans. Yes, you can create custom validation annotations using JSR 303/349. To create a custom annotation, you need to define the annotation interface and implement a corresponding validator class that implements the ConstraintValidator interface. The validator class will contain the validation logic for the custom annotation.
| 4. Is it possible to perform cross-field validations using JSR 303/349 annotations? | |
Ans. Yes, it is possible to perform cross-field validations using JSR 303/349 annotations. You can create a custom validation annotation and implement the corresponding validator class to perform cross-field validations. In the validator class, you can access the values of other fields in the bean and apply custom validation logic based on those values.
| 5. What happens if there are validation errors in a Spring MVC form submission? | |
Ans. If there are validation errors in a Spring MVC form submission, the Spring MVC framework automatically binds the form data to the form backing bean and performs the validation. If there are validation errors, the framework adds the errors to the BindingResult object. You can then handle these errors in your controller and redirect the user back to the form with the validation error messages displayed.
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Nov 19, 2024 Last updated |
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