protected Set<Specialty> getSpecialtiesInternal() {
        if (this.specialties == null) {
            this.specialties = new HashSet<>();
        }
        return this.specialties;
    }
Simple JavaBean domain object representing a veterinarian.

@author Ken Krebs
@author Juergen Hoeller
@author Sam Brannen
@author Arjen Poutsma
src/main/java/org/springframework/samples/petclinic/model/Vet.java