Question

I recently started my first Java project that uses Hibernate (and JPA Annotations) for persistence.

I’ve got the following classes:

User class

*some imports*
@Entity
public class Owner {
        private int id;
        private String name;
        @OneToOne(fetch=FetchType.LAZY)
        @JoinColumn(name="id")
        private Pet pet;

        @Id
        @GeneratedValue
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }

        public void setPet(Pet pet) {
            this.pet = pet;
        }
        public Pet getPet() {
            return pet;
        }
    }

Pet Class

*some imports*
@Entity 
public class Pet {
        private String name;
        @Id
        @GeneratedValue
        private int id;

        public void setId(int id) {
            this.id = id;
        }
        public int getId() {
            return id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
    }

Whenever I try to save an object, Hibernate gives me the following error output.

Exception in thread "main" org.hibernate.MappingException: Could not determine type for: Pet, at table: Owner, for columns: [org.hibernate.mapping.Column(pet)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:306)
at org.hibernate.mapping.Column.getSqlTypeCode(Column.java:164)

What am I missing? I can’t figure out how to do this PF-FK mapping.

Do I need to tell Hibernate which table Pet maps into or is it smart enough to do that? Could someone please suggest how I can change my declaration of the Pet ivar so that Hibernate and I can be happy? 🙂

Thanks!

Answer 1

I guess it’s caused by the fact that you mixed annotations on fields and properties. You need to place annotations in a consistent way, unless you explicitly indicate how they are placed with @Access/@AccessType.