Java Spring Boot custom validation: generic validation for all enums

Question

For a SpringBoot project I'm using custom validation using custom annotations. In particular, I have a lot of enums and I would like to validate if into the inputs there are correct enums values (e.g. from json to DTO objects)

I'm using this approach: I defined my annotation:

@Target( { FIELD, PARAMETER })
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(validatedBy = PlatformValidator.class)
public @interface PlatformValidation {

    String message() default "Invalid platform format";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};
}

and my validator:

public class PlatformValidator implements ConstraintValidator<PlatformValidation, String>
{
    public boolean isValid(String platform, ConstraintValidatorContext cxt) {

        try {
            if (!isNull(platform)) {
                Platform.valueOf(platform);
            }
            return true;
        } catch (Exception ex) {
            return false;
        }
    }
}

My question is, can I have a generic enum validation annotation and specify the enum that I need as a parameter of my annotation?

Something like @MyValidation(enum=MyEnum, message= ...)

This should work fine (though you need a different name from enum and should probably just use Class<? extends Enum<?>> value()). Is there a specific reason you're not simply using the enum as the POJO property type? — chrylis -cautiouslyoptimistic-
– chrylis -cautiouslyoptimistic-, Commented Nov 4, 2022 at 18:41

Duc Vo · Accepted Answer · 2022-11-05 00:23:30Z

1

For the generics approach is use Java reflection. So the annotation should be:

@EnumValidation(enum=YourEnum.class, message=...)

The tutorial about reflection: Jenkov's Tutorial

answered Nov 5, 2022 at 0:23

Duc Vo

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2 Comments

Safari Over a year ago

How can I retrieve the parameter 'enum' (that it will be a .class) into my validator (into the isValid method) ?

Duc Vo Over a year ago

@Safari you can retrieve by override method of initialize See more at here: baeldung.com/…

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