I intent using it as Compound constraint without validator implementation. Shouldn't the target in this case be inferred by the declaration? I do not make use of @SupportedValidationTarget because I do not provide any validator implementation for the constraint.

For example, if I replace the above CustomMin.java with the below CompoundMin.java I still get the same "target cannot be inferred" exception:

@Min(1)
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = { })
public @interface CompoundMin {

    String message() default "{javax.validation.constraints.Min.message}";

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

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

}