Java custom validation annotation

Question

    public class Student{
    @NotNull
    private Course course= null;

    @CustomValidation(enumCourse = course)
    private String details = null;
    }
}

How can i pass the course variable to CustomValidation annotation? Im getting an error saying that course must be an enum constant expression.

I have written a custom validation interface and validator too.

Mạnh Quyết Nguyễn · Accepted Answer · 2018-05-15 14:45:30Z

2

Annotation property must be constant at compile time.

You cannot use variable there.

The keyword here is cross fields validation.

You have two option:

Create annotation at class level. There you have access to all properties of class and validation should be done easy
Or create annotation at method level which return all necessary fields for validations.
```
@CustomAnnotations
Pair<Course, String> getCourseAndDetailForValidation() {
   return Pair.of(course, details)
}
```
You can change return type to match your taste, it may be a List, an Array, wrapper objects...

answered May 15, 2018 at 14:45

Mạnh Quyết Nguyễn

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2 Comments

user2514421 Over a year ago

How do i pass this method to @CustomValidation(enumCourse = course) ?

Mạnh Quyết Nguyễn Over a year ago

Did you read about custom validation? Once you annotated your method with @CustomAnnotation, in your CustomAnnotationValidator.java class, you have access those properties (course and details) inside isValid() method, and you can implement your logic there

cecunami · Accepted Answer · 2018-05-15 14:48:35Z

0

It's specified by section 9.6.1 of the JLS. The annotation member types must be one of:

primitive String Class an Enum another Annotation an array of any of the above

Course must be one of those types.

answered May 15, 2018 at 14:48

cecunami

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