我有三个相关的课程如下：

@AllArgsConstructor
@NoArgsConstructor
@ToString(callSuper = true)
@Getter
@Setter
@Entity
public class Job implements Serializable {

    @Id
    @Column(name = "JOB_ID")
    private String jobId;

    @OneToMany(fetch = FetchType.EAGER, orphanRemoval = true, cascade = CascadeType.REFRESH)
    private List<Task> tasks;

}

@NoArgsConstructor
@ToString(callSuper = true)
@Getter
@Setter
@Entity
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "taskId", scope = Task.class)
public class Task implements Serializable {

    @Id
    @Column(name = "TASK_ID")
    private String taskId;

    @Embedded
    private DockerEnvironment environment;

}

和/或

@AllArgsConstructor
@NoArgsConstructor
@ToString(callSuper = true)
@Getter
@Setter
@Embeddable
@JsonTypeName(value = "docker")
public class DockerEnvironment extends AbstractInstallation {

    @Column(name = "DOCKER_IMAGE")
    private String dockerImage;

    @Column(name = "PORT")
    @JsonProperty("port")
    private String port;

    @ElementCollection
    @CollectionTable(name = "DOCKER_ENV_VARS_MAPPING", joinColumns = { @JoinColumn(name = "DOCKER_TASK_ID") })
    @MapKeyColumn(name = "ENVVAR_KEY")
    @Column(name = "ENVVAR_VALUE")
    private Map<String, String> environmentVars;

}

我发送一个REST请求来创建一个带有以下JSON部分的作业：

.
.
.
"tasks": [{
    "installation": {
        "environmentVars": {
            "MYSQL_DATABASE": "NAME",
            "MYSQL_USER": "USER",
            "MYSQL_ROOT_PASSWORD": "admin"
            }
.
.
.

在我的代码中的某个时刻，我手动保存新创建的对象，方法是：

repositoryService.saveTask(newTask);
repositoryService.saveJob(newJob);
repositoryService.flush();

在调试时，我看到一切正常，但在DB environmentVars表（DOCKER_ENV_VARS）为空之后。请问有什么问题吗？