问无法使用OneToOne映射保存数据

EN

ORA-02291: integrity constraint (TableName.TEST_ID) violated - parent key not found

CREATE TABLE EW_TEST_REFTABLE (
  ID int NOT NULL PRIMARY KEY,
  TESTNAME VARCHAR2(20) NOT NULL,
  TESTID int,
  CONSTRAINT test_id FOREIGN KEY(TESTID)
  REFERENCES EW_TESTDATA(TESTID)
);

@Entity
@Table(name = "EW_TESTDATA")
public class Ew_testdata {
    @Id
    @SequenceGenerator(name = "sube_seq",
            sequenceName = "EW_TESTDATA_SEQ",
            allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sube_seq")

    @Column(name = "TESTID")
    private int testid;

    @Column(name = "TESTNAME")
    private String testname;

    // Ew_test_reftable  is another entity class.In that table the column
    // TESTID (foreign key) must be same as the primary key of this 
    // entity/table(EW_TESTDATA)
    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "TESTID",unique = true)
    private Ew_test_reftable ewtestreftable;

       //Constructor
       // getter & setter
    }

@Entity
@Table(name = "EW_TEST_REFTABLE")
public class Ew_test_reftable {

    @Id
    @SequenceGenerator(name = "subf_seq", sequenceName = "EW_REF_SEQ", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "subf_seq")
    @Column(name = "ID")
    private int id;

    @Column(name = "TESTNAME")
    private String testname;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "TESTID")
    private int testid;
    //Constructor,getter & setter
}

@Override
    public Ew_testdata ew_testdata(String name) {

        Ew_test_reftable ew_test_reftable = new Ew_test_reftable();
        ew_test_reftable.setTestname("test");
        Ew_testdata ew_testdata = new Ew_testdata();
        ew_testdata.setTestname(name);
        ew_testdata.setEwtestreftable(ew_test_reftable);
        iew_tEst.ewTestdata(ew_testdata);
        return null;
    }