由于循环引用，Spring boot应用程序未加载Swagger rest服务

Question

我们有一个带有300个Rest服务的Spring Boot应用程序，我们正试图为其生成一个招摇过市的文档。我们集成了Swagger，并将所需的Json参数添加到POJO中。当我们启动应用程序时，服务器甚至在15分钟左右也不会启动，当我们查看日志时，它会以以下格式显示。

2019-07-29 10:43:20,299 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding collectionElement type Lcom/test/google/model/section/period/timetable/TimeTableTuesdayPeriod;
2019-07-29 10:43:20,299 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for collectionElement type Lcom/test/google/model/section/period/timetable/TimeTableTuesdayPeriod;
2019-07-29 10:43:20,300 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Lcom/test/google/model/section/period/Period; for parameter period
2019-07-29 10:43:20,300 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for type Lcom/test/google/model/section/period/Period;
2019-07-29 10:43:20,300 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Lcom/test/google/model/section/period/PeriodTimeTable; for parameter periodTimeTable
2019-07-29 10:43:20,301 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for type Lcom/test/google/model/section/period/PeriodTimeTable;
2019-07-29 10:43:20,301 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Ljava/util/Set<Lcom/test/google/model/section/period/timetable/TimeTableWednesdayPeriod;>; for parameter timeTableWednesdayPeriod
2019-07-29 10:43:20,301 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding collectionElement type Lcom/test/google/model/section/period/timetable/TimeTableWednesdayPeriod;
2019-07-29 10:43:20,301 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for collectionElement type Lcom/test/google/model/section/period/timetable/TimeTableWednesdayPeriod;
2019-07-29 10:43:20,302 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Lcom/test/google/model/section/period/Period; for parameter period
2019-07-29 10:43:20,302 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for type Lcom/test/google/model/section/period/Period;
2019-07-29 10:43:20,302 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Lcom/test/google/model/section/period/PeriodTimeTable; for parameter periodTimeTable
2019-07-29 10:43:20,303 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for type Lcom/test/google/model/section/period/PeriodTimeTable;
2019-07-29 10:43:20,303 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Lcom/test/google/model/section/period/PeriodTimeTable; for parameter periodTimeTable
2019-07-29 10:43:20,304 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for type Lcom/test/google/model/section/period/PeriodTimeTable;
2019-07-29 10:43:20,304 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Ljava/util/Set<Lcom/test/google/model/section/period/timetable/TimeTableSaturdayPeriod;>; for parameter timeTableSaturdayPeriod
2019-07-29 10:43:20,305 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding collectionElement type Lcom/test/google/model/section/period/timetable/TimeTableSaturdayPeriod;
2019-07-29 10:43:20,305 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for collectionElement type Lcom/test/google/model/section/period/timetable/TimeTableSaturdayPeriod;
2019-07-29 10:43:20,306 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Adding type Lcom/test/google/model/section/period/Period; for parameter period
2019-07-29 10:43:20,306 DEBUG springfox.documentation.schema.DefaultModelDependencyProvider [main] Recursively resolving dependencies for type Lcom/test/google/model/section/period/Period;

似乎应用程序递归地试图一次又一次地访问相同的对象，使其成为一个循环引用问题。

下面是我们用于POJO的代码和注释：

@Entity(name="sections")
@JsonIdentityInfo(scope=Section.class,generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class Section implements Serializable {


    @Id
    @Column(unique=true, nullable=false, length=19)
    private long id;
    @OneToMany(mappedBy="section")
    private Set<ReportCardTemplate> reportCardTemplate;
    @OneToMany(mappedBy="section")
    private Set<Admission> admission;
    @ManyToOne(optional=false)
    @JoinColumn(name="section_type_id", nullable=false)
    private SectionType sectionType;


@Entity(name="report_card_templates")
@JsonIdentityInfo(scope=ReportCardTemplate.class, generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class ReportCardTemplate implements Serializable {

    @Id
    @Column(unique=true, nullable=false, length=19)
    private long id;
    @ManyToOne(optional=false)
    @JoinColumn(name="section_id", nullable=false)
    private Section section;


@Entity(name="admissions")
@JsonIdentityInfo(scope=Admission.class,generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class Admission implements Serializable {

    @Id
    @Column(unique=true, nullable=false, length=19)
    private long id;
    @ManyToOne(optional=false)
    @JoinColumn(name="actor_id", nullable=false)
    private Actor actor;
    @OneToOne(optional=false)
    @JoinColumn(name="subject_preference_id", nullable=false)
    private StudentSubjectPreference studentSubjectPreference;
    @ManyToOne(optional=false)
    @JoinColumn(name="section_id", nullable=false)
    private Section section;
    @OneToMany(mappedBy="admission")
    private Set<ExamSubjectMark> examSubjectMark;

非常感谢您对这个问题的任何帮助。。。。提前感谢！

Answer 1

您可以在循环依赖项上使用ApiModelProperty（hidden=true）注释

...
@ApiModelProperty(hidden = true)
private Section section;