为什么在序列化相关对象时，所有字段都设置为null

Question

我有两个具有@OneToOne关系的实体：

@Entity
@Table(name="daily_report")
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class DailyReport {

    private String rigPhone;
    private DailyReportInfo dailyReportInfo;

    @OneToOne(fetch = FetchType.EAGER, cascade = {CascadeType.ALL}, optional = false)
    @JoinColumn(name = "daily_report_info_id")
    public DailyReportInfo getDailyReportInfo() {
        return dailyReportInfo;
    }

    public void setDailyReportInfo(DailyReportInfo dailyReportInfo) {
        this.dailyReportInfo = dailyReportInfo;
    }

    @Column(name = "rig_phone")
    public String getRigPhone() {
        return rigPhone;
    }

    public void setRigPhone(String rigPhone) {
        this.rigPhone = rigPhone;
    }

}

@Entity
@Table(name="daily_report_info")
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class DailyReportInfo {

    private Long id;

    private DailyReport dailyReport;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @JsonIgnore
    @OneToOne(mappedBy = "dailyReportInfo", fetch = FetchType.LAZY)
    public DailyReport getDailyReport() {
        return dailyReport;
    }

    public void setDailyReport(DailyReport dailyReport) {
        this.dailyReport = dailyReport;
    }
}

我正在尝试测试仅更新对象“ DailyReportInfo”中的一个字段。

public class JacksonTest {

    @Test
    public void updateFromString() {
        DailyReport dailyReport = new DailyReport();
        dailyReport.setRigPhone("123123");
        DailyReportInfo dailyReportInfo = new DailyReportInfo();
        dailyReportInfo.setId(1L);
        dailyReport.setDailyReportInfo(dailyReportInfo);

        String json = "{\"dailyReportInfo\":{\"actualDays\":11.0}}";

        ObjectMapper OBJECT_MAPPER = new ObjectMapper();
        OBJECT_MAPPER.readerForUpdating(dailyReport).readValue(json);

        assertThat(dailyReport.getRigPhone(), equalTo("123123"));           // correct
        assertThat(dailyReport.getDailyReportInfo().getId(), equalTo(1L));  // not correct = equal null, why???
    }
}

但是结果是，相关对象的所有字段都被重置，并且仅添加了我发送的字段。 如何解决？我希望保留所有字段，但只更新一个已传输的字段。