child中的Hibernate One-To-One父ID为null

Question

我在hibernate中存在级联问题。

我有这两个实体：

@Entity
@Table(name = "testscenario")
public class Testscenario {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(unique = true, nullable = false, name = "scenario_id")
    Long scenarioId;

    @OneToOne(mappedBy = "scenario", cascade = CascadeType.ALL)
    private Mapping mapping;
....

@Entity
@Table(name = "mapping")
public class Mapping {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(unique = true, nullable = false, name = "mapping_id")
    Long id;

    @OneToOne
    @JoinColumn(name = "scenario_id", referencedColumnName = "scenario_id")
    private Testscenario scenario;

当我尝试存储实体时，子实体的父ID保持为null。这就是我存储实体的方式：

Testscenario testscenario = new Testscenario();
testscenario.setName(scenarioName);
testscenario.setForwarder(forwarder);
Mapping mapping = new Mapping();
        mapping.setJar(mappingFileParam.getBytes());
        mapping.setJarFilename(mappingFileParam.getOriginalFilename());
        mapping.setSourceFormat("sourceFormat");
        mapping.setDescription("description");
        mapping.setTargetFormat("targetFormat");
        testscenario.setMapping(mapping);
testscenarioService.create(testscenario)

我做错了什么？