Multiple field validation with Spring boot ConstraintValidator is not working

Question

I'm trying to validate multiple fields using spring boot constraintValidator. But it doesn't buzz with no error in it.

Can someone please help me find it out..

Controller

@PostMapping("/greetings")
    public Greeting greeting(@RequestBody Greeting greeting) {
        System.out.println(greeting);
        return greeting;
    }

Bean thats needs to be validated

@GreetingAnnotation
public class Greeting {
    private final long id;
    private final String content;

    public Greeting(long id, String content) {
        this.id = id;
        this.content = content;
    }

    public long getId() {
        return id;
    }

    public String getContent() {
        return content;
    }
}

Annotation

@Constraint(validatedBy = GreetingValidator.class)
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface GreetingAnnotation {
    String message() default "Field is required";
    Class<?>[] groups() default { };
    Class<? extends Payload>[] payload() default { };
}

Validator

public class GreetingValidator implements ConstraintValidator<GreetingAnnotation, Greeting > {

    @Override
    public boolean isValid(Greeting greeting, ConstraintValidatorContext context) {
        return greeting.getId() >=0 && greeting.getContent().length() >=100; // Never gets called
    }
}

NOTE: This is just a sample stub for validating an object

Thanks in advance

Answer 1

Are you using @Validated at your controller level ?

If Not they add it. It will work.