问重复键值违反唯一约束。

EN

  CREATE TABLE patients(
    patient_id BIGSERIAL NOT NULL,
    first_name VARCHAR(255) NOT NULL,
    last_name VARCHAR(255) NOT NULL,
    PRIMARY KEY(patient_id));

    CREATE TABLE address (
    patient_id BIGINT NOT NULL,
    city VARCHAR(255),
    province VARCHAR(255),
    PRIMARY KEY(patient_id),
    CONSTRAINT testcollection FOREIGN KEY(patient_id) REFERENCES patients(patient_id));

@Entity
@Table(name = "patients")
public class Patient {

    @Id
    @GenericGenerator(name = "primaryIncrement", strategy = "increment")
    @GeneratedValue(generator = "primaryIncrement")
    @Column(name = "patient_id")
    private long patientID;

    @Column(name = "first_name")
    private String firstName;

    @Column(name = "last_name")
    private String lastName;

    @ElementCollection
    @JoinTable(name="address", joinColumns=@JoinColumn(name = "patient_id"))
    private Collection<Address> listOfAddresses = new ArrayList<Address>();

@Embeddable
public class Address {

    @Column(name = "city")
    private String city;

    @Column(name = "province")
    private String province;

Configuration config = new Configuration();

        config.configure("hibernate.cfg.xml");

        SessionFactory sessionFactory = config.buildSessionFactory();

        Session session = sessionFactory.openSession();

        Transaction transaction = session.getTransaction();
        transaction.begin();

        Patient patient = new Patient();
        Address address = new Address();
        Address homeAddress = new Address();
        patient.setFirstName("Ron");
        patient.setLastName("Weasly");
        address.setCity("Diagon Alley");
        address.setProvince("london");
        homeAddress.setCity("Abbey Road");
        homeAddress.setProvince("Chelsea");
        patient.getListOfAddresses().add(address);
        patient.getListOfAddresses().add(homeAddress);

        session.save(patient);
        transaction.commit();
        session.close();

        System.out.println("Successfully Saved!");