public interface Person {
    Integer getId(); void setId(Integer id);
    String getName(); void setName(String name);
    Person getFriend(); void setFriend(Person person);
}

import javax.persistence.*;
import org.hibernate.annotations.Proxy;

@Entity
@Proxy(proxyClass = Person.class)
public class PersonEntity implements Person {
    public static void main(String[] args) {
        final EntityManagerFactory factory = Persistence.createEntityManagerFactory("persistence");
        final EntityManager entityManager = factory.createEntityManager();
        System.out.println(entityManager.createQuery("from PersonEntity where friend = :friend", PersonEntity.class)
                .setParameter("friend", entityManager.getReference(PersonEntity.class, 1)).getResultList());
    }

    private Integer id; private String name; private Person friend;

    @Override @Id
    @GeneratedValue
    public Integer getId() { return id; }
    @Override public void setId(Integer id) { this.id = id; }

    @Override @Basic
    public String getName() { return name; }
    @Override public void setName(String name) { this.name = name; }

    @Override @OneToOne(targetEntity = PersonEntity.class) public Person getFriend() { return this.friend; }
    @Override public void setFriend(Person friend) { this.friend = friend; }
}

private static boolean isValidBindValue(Class expectedType, Object value, TemporalType temporalType) {
-if ( expectedType.isInstance( value ) ) {
+if ( expectedType.isAssignableFrom( HibernateProxyHelper.getClassWithoutInitializingProxy(value) ) ) {
    return true;
}