CODEWITHSUNDEEP
javaannotations
Shashank Dwivedi
Shashank Dwivedi

Reputation: 407

Custom annotation for method parameter

I am trying to validate a method parameter using custom annotation, but annotation validator is not getting invoked.

The annotation

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.CONSTRUCTOR, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = FieldValidator.class)
public @interface ValidField {
    String message() default "Incorrect field.";

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

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

The FieldValidator

public class FieldValidator implements ConstraintValidator<ValidField, String> {
    @Override
    public void initialize(final ValidField arg0) {
    }

    @Override
    public boolean isValid(final String field, final ConstraintValidatorContext context) {
        System.out.println("Called annotations successfully - "+ field);
        return false;
    }
}

Testing through the main method

 public void testAnnotation(@ValidField String q){
        System.out.println("inside testAnnotation..");
  }
    /************************* TESTING ****************************/
    public static void main(String[] args) {

        Test test= new Test();
        test.testAnnotation("sample");

Expected: Called annotations successfully - sample should be displayed in the console

Upvotes: 1

Views: 4119

Answers (1)

Shashank Dwivedi
Shashank Dwivedi

Reputation: 407

Okay, It was a mistake testing it by the main method. @Retention(RetentionPolicy.RUNTIME) says annotation will be available at runtime.

It was tested successfully by the service call when the server is running.

Upvotes: 1

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