Explanation/Reference:
Example of a ElementCollection relationship to a basic value annotations[edit]
@Entity
public class Employee {
@Id
@Column(name="EMP_ID")
private long id;
...
@ElementCollection
@CollectionTable(
name="PHONE",
joinColumns=@JoinColumn(name="OWNER_ID")
)
@Column(name="PHONE_NUMBER")
private List<String> phones;
...
}
Reference: Java Persistence/ElementCollection
http://en.wikibooks.org/wiki/Java_Persistence/ElementCollection