Error setting a default null value for an annotation's field

Question

Why am I getting an error \"Attribute value must be constant\". Isn\'t null constant???

@Target(ElementType.TYPE)
@Retention(RetentionPolicy         


        

Answer 1

It seem there is one other way of doing it.

I don't like this either, but it might work.

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface SomeInterface {
    Class<? extends Foo>[] bar() default {};
}

So basically you create an empty Array instead. This seems to allow a default value.