https://github.com/jwcarman/techolympics

https://github.com/jwcarman/techolympics

Last synced: 4 months ago
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• Host: GitHub
• URL: https://github.com/jwcarman/techolympics
• Owner: jwcarman
• Created: 2019-02-14T04:22:44.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-02-23T06:00:30.000Z (over 6 years ago)
• Last Synced: 2025-01-13T03:13:41.711Z (5 months ago)
• Language: Java
• Size: 58.6 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Validating Data With the Bean Validation API (JSR-380)

### Validate Registrations

1. Add a ```@Validated``` annotation to the ```RegistrationService``` interface.

2. Add ```@NotNull``` and ```@Valid``` annotations to the ```Registration``` parameter of the ```registerStudent()``` method in the ```RegistrationService``` interface.

3. Add an ```@Email``` annotation to the ```email``` field in the ```Registration``` class.

    

4. Add ```@NotEmpty``` constraints to the rest of the fields in the ```Registration``` class.

5. In your browser, try to register a student with a invalid data.

       

    - What happens?

   

### Validate Email Parameters

1. Add an ```@Email``` annotation to the ```email``` parameter of the ```getStudentRegistration()``` and ```unregisterStudent()``` methods in the ```RegistrationService``` interface.

2. In your browser, try to pass an invalid email address to either of these methods.

    - What happens?

### Handle ConstraintViolationExceptions

1. Add the following method to the ```ErrorHandlerAdvice``` class:

    ```java

    @ExceptionHandler(ConstraintViolationException.class)

    @ResponseStatus(HttpStatus.BAD_REQUEST)

    public List onConstraintViolation(ConstraintViolationException e) {

        return e.getConstraintViolations().stream()

                .map(ConstraintViolation::getMessage)

                .collect(Collectors.toList());

    }

    ```

2. In your browser, perform an operation that violates a validation constraint.

    - What happens now?

           

### Custom Error Messages

1. Modify the ```@Email``` constraint on the ```email``` field in the ```Registration``` class:

    ```java

    @Email(message = "{registration.email.invalid}")

    ```

2. Add the following line to the ```ValidationMessages.properties``` file:

    ```properties

    registration.email.invalid=Registration email value "${validatedValue}" is invalid.

    ```

3. Try to register a student with an invalid email address.

    - Do you see your custom message?

4. **BONUS**: figure out how to use the other error messages in the ```ValidationMessages.properties``` file.