Our User class uses three of the new constraints introduced by Bean Validation 2.0:
- @NotBlank: Assures that the value is not null, empty, or an empty string (it trims the value before evaluation, to make sure there aren't spaces).
- @Email: Allows only a valid email format. Forget those crazy JavaScript functions!
- @NotEmpty: Ensures that a list has at least one item.
- @PositiveOrZero: Guarantees that a number is equal or greater than zero.
Then we create a test class (using JUnit) to test our validations. It first instantiates Validator:
@BeforeClasspublic static void setUpClass() { validator = Validation.buildDefaultValidatorFactory().getValidator();}
Validator is an API that validates beans according to the constraints defined ...
