How to Dynamically Resolve Message Parameters in Hibernate Validator

How can I dynamically resolve message parameters when using Hibernate Validator?

Hibernate Validator is a powerful framework for validating Java objects. One of its features is to allow dynamic resolution of message parameters in your validation messages. This capability can be essential when your error messages need to be more contextual and informative based on user input or other dynamic factors.

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.AssertTrue;

public class CustomValidator implements ConstraintValidator<AssertTrue, Boolean> {
    @Override
    public boolean isValid(Boolean value, ConstraintValidatorContext context) {
        boolean valid = (value != null && value);
        if (!valid) {
            context.disableDefaultConstraintViolation();
            context.buildConstraintViolationWithTemplate("{custom.message.key}")
                .addConstraintViolation();
        }
        return valid;
    }
}

Causes

• Using static message formats that do not allow for parameter substitution.
• Not leveraging the 'MessageInterpolator' API provided by Hibernate Validator.
• Incorrectly configuring validation messages in properties files.

Solutions

• Use the MessageInterpolator interface to customize the way parameters are handled in messages.
• Define validation messages in properties files with placeholders that can be replaced dynamically.
• Utilize the `@AssertTrue` or `@AssertFalse` annotations that can reference dynamic properties directly.

Mistake: Assuming that all parameters will be injected automatically without any configuration.

Solution: Be explicit in defining dynamic message keys in the validation annotations.

Mistake: Failing to handle null or unexpected input scenarios.

Solution: Always validate the input and provide fallback messages.