JAXB：在对象图中检测到周期

我有twi实体。分类实体：JAXB：在对象图中检测到周期

@XmlRootElement 
@XmlAccessorType(XmlAccessType.FIELD) 
@Entity 
@Table(name = "EPBS_DATA.NEWS_CATEGORY") 
@XmlType(propOrder = { "id", "name", "news" }) 
public class CategoryEntity { 
    public final static String ID_GENERATOR_NAME = 
    "EPBS_DATA.sq_news_category"; 
    @Id 
    @Column(name = "ID", nullable = false) 
    @GeneratedValue(strategy = GenerationType.SEQUENCE, 
       generator = ID_GENERATOR_NAME) 
    @SequenceGenerator(name = ID_GENERATOR_NAME, 
        sequenceName = ID_GENERATOR_NAME, allocationSize = 1) 
    private long id; 

    @Column(name = "CATEGORY_NAME", nullable = false, length = 1024) 
    private String name; 
    @ManyToMany(mappedBy = "categories") 
    @XmlElementWrapper(name = "news") 
    @XmlElement(name = "") 
    private List<NewsEntity> news = new ArrayList<NewsEntity>(); 

    setters/getters 
}

和NewsEntity

@XmlRootElement 
@XmlAccessorType(XmlAccessType.FIELD) 
@Entity 
@Table(name = "EPBS_DATA.NEWS") 
@XmlType(propOrder = 
    { "id", "body", "lead", "creatorId", "date", "federal", "regId", 
     "raw", "file", "title", "editDate", "fixed", "categories", 
     "publishDates" }) 
public class NewsEntity { 
    public final static String ID_GENERATOR_NAME = "EPBS_DATA.SQ_EPBS"; 
    public final static String GET_NEWS_BY_DATE = "NewsEntity.getNewsByDate"; 
    public final static String GET_NEWS_COUNT = "NewsEntity.getNewsCount"; 
    public final static String GET_DATES = "NewsEntity.getDates"; 
    @Id 
    @Column(name = "NEWS_ID", nullable = false) 
    @GeneratedValue(strategy = GenerationType.SEQUENCE, 
       generator = ID_GENERATOR_NAME) 
@SequenceGenerator(name = ID_GENERATOR_NAME, 
        sequenceName = ID_GENERATOR_NAME, allocationSize = 1) 
    private long id; 
    @Column(name = "NEWS_BODY", nullable = true) 
    @Lob 
    private String body; 
    @ManyToMany 
    @JoinTable(name = "EPBS_DATA.NEWS_CATEGORY_ASSIGMENT", 
      joinColumns = @JoinColumn(name = "ID_NEWS", 
            referencedColumnName = "NEWS_ID"), 
      inverseJoinColumns = 
      @JoinColumn(name = "ID_CATEGORY", referencedColumnName = "ID")) 
    @XmlInverseReference(mappedBy = "news") 
    @XmlElementWrapper(name = "categories") 
    @XmlElement(name = "") 
    private List<CategoryEntity> categories = new ArrayList<CategoryEntity>();

我有误差的循环对象图中检测到。这将导致无限深XML：[email protected] - > [email protected] - > [email protected]]

我尝试使用@XmlTransient和@XmlInverseReference，但无论我有错误。

来源

2017-08-30 NickDevil

尚未此数据 - [email protected]引用自身？你的数据是什么？ – farrellmr

在你的对象图中的周期无关的JPA API，因为任何JPA提供商可以与这样的事情处理。这只是XML。所以删除JPA标签 –

你豆称呼对方：CategoryEntity.news至少包含一个NewsEntity其属性类别中包含上述CategroyEntity。试图将其输出为XML会导致无尽的循环。根据您的“主要”实体，您必须将@XmlTransient标记为类别或新闻。

来源

2017-08-30 15:57:51 fhossfel

JAXB：在对象图中检测到周期

回答

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