How to handle DataIntegrityViolationException in Spring?

user_249699 0
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I need to show custom messages in my Spring 3.0 application. I have a database with Hibernate and there are several constraints. I have doubts in how DataIntegrityViolationException should be handled in a good way. I wonder if there is a way to map the exception with a message set in a properties file, as it is possible in Constraints validation. Could I handle it automatically in any way or I have to catch this exception in each controller?

spring-mvc exception-handling spring java
4 Answers

The problem with showing user-friendly messages in the case of constraint violation is that the constraint name is lost when Hibernate's ConstraintViolationException is being translated into Spring's DataIntegrityViolationException.

However, you can customize this translation logic. If you use LocalSessionFactoryBean to access Hibernate, you can supply it with a custom SQLExceptionTranslator (see LocalSessionFactoryBean.jdbcExceptionTranslator). This exception translator can translate a ConstraintViolationException into your own exception class, preserving the constraint name.

user_1031540

Spring 3 provides two ways of handling this - HandlerExceptionResolver in your beans.xml, or @ExceptionHandler in your controller. They both do the same thing - they turn the exception into a view to render.

Both are documented here.

user_212340

1. In your request body class check for not null or not empty like this

public class CustomerRegisterRequestDto {
    @NotEmpty(message = "first name is empty")
    @NotNull(message = Constants.EntityValidators.FIRST_NAME_NULL)
    private String first_name;
    //other fields
    //getters and setters
}

2. Then in your service check for this

ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
    Validator validator = factory.getValidator();
    Set<ConstraintViolation<CustomerRegisterRequestDto>> violations = validator.validate(userDto);
    if (!violations.isEmpty()) {
        //something is wrong in request parameters
        List<String> details = new ArrayList<>();
        for (ConstraintViolation<CustomerRegisterRequestDto> violation : violations) {
            details.add(violation.getMessage());
        }
        ErrorResponse error = new ErrorResponse(Constants.ErrorResponse.REQUEST_PARAM_ERROR, details);
        return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
    }

3. Here is your ErrorResponse class

user_88749580
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