Issue

javax.validation.UnexpectedTypeException: HV000030: No validator could be found for type my.types.Day.

• An entity has an enum property which is mapped with @Enumerated(EnumType.STRING)

public enum Day {
    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY 
}

import javax.persistence.Enumerated;
import javax.persistence.EnumType;

@Entity
public class Week ... {
    @Enumerated(EnumType.STRING)
    ...
    private Day day;
}

• Using JSR 303 bean validation constraints with the enum entity property
  • Using @Length
  • Using a custom implementation of javax.validation.ConstraintValidator