Hibernate OneToMany java.lang.StackOverflowError

Question

這是我在堆棧上的第一個問題，所以請溫柔：D

我正在嘗試創建 hibernate OneToMany 關系。 當我嘗試從我的數據庫中獲取一些數據時，我得到了 StackOverflowError。 但是當我刪除 OneToMany 部分時，一切正常。 這是我的 REST 服務的一部分，目前它在 VMware vFabric 服務器和 MySQL DB 上運行。

獲取示例：

@Inject
private EntityManager entityManager;
...
entityManager.find(League.class, 1);
...
entityManager.find(Team.class, 1);

MySQL 腳本：

CREATE TABLE league (
    id int(11) NOT NULL AUTO_INCREMENT,
    name varchar(20) COLLATE utf8_unicode_ci NOT NULL,
    PRIMARY KEY (id)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE team (
    team_id int(11) NOT NULL AUTO_INCREMENT,
    name varchar(20) COLLATE utf8_unicode_ci NOT NULL,
    fk_leagueId int(11) NOT NULL,
    PRIMARY KEY (team_id),
    FOREIGN KEY (fk_leagueId) REFERENCES league(id)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

課程：

@XmlRootElement
@Entity
@Table(name = "team")
@Data
public class Team {
    @Id
    @GeneratedValue(generator = "increment")
    @GenericGenerator(name = "increment", strategy = "increment")
    @Column(name = "team_id")
    private int id;
    @Column(name = "name")
    private String name;
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "fk_leagueId", nullable = false)
    private League league;
}

@XmlRootElement
@Entity
@Table(name = "league")
@Data
public class League {
    @Id
    @GeneratedValue(generator = "increment")
    @GenericGenerator(name = "increment", strategy = "increment")
    @Column(name = "id")
    private int id;
    @Column(name = "name")
    private String name;
    //if I comment 2 lines below, there is no error, and everything works fine
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "league")
    private Set<Team> teams;
}

錯誤：

Hibernate: select league0_.id as id1_1_0_, league0_.name as name2_1_0_ from league league0_ where league0_.id=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Hibernate: select teams0_.fk_leagueId as fk3_1_1_, teams0_.team_id as team1_4_1_, teams0_.team_id as team1_4_0_, teams0_.fk_leagueId as fk3_4_0_, teams0_.name as name2_4_0_ from team teams0_ where teams0_.fk_leagueId=?
Exception in thread "tomcat-http--3" java.lang.StackOverflowError
    at org.jboss.logging.JDKLogger.translate(JDKLogger.java:73)
    at org.jboss.logging.JDKLogger.isEnabled(JDKLogger.java:85)
    at org.jboss.logging.JDKLogger.doLog(JDKLogger.java:41)
    at org.jboss.logging.Logger.debug(Logger.java:406)
    at org.hibernate.internal.CoreMessageLogger_$logger.debug(CoreMessageLogger_$logger.java:525)
    at org.hibernate.engine.jdbc.spi.SqlStatementLogger.logStatement(SqlStatementLogger.java:104)
    at org.hibernate.engine.jdbc.spi.SqlStatementLogger.logStatement(SqlStatementLogger.java:95)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:180)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:159)
    at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1858)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1835)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1815)
    at org.hibernate.loader.Loader.doQuery(Loader.java:899)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:311)
    at org.hibernate.loader.Loader.loadCollection(Loader.java:2234)
    at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:65)
    at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:674)
    at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
    at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1849)
    at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:549)
    at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:234)
    at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:545)
    at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:124)
    at org.hibernate.collection.internal.PersistentSet.hashCode(PersistentSet.java:428)
    at com.lukaszb.motspe.webapp.model.League.hashCode(League.java:21)
    at com.lukaszb.motspe.webapp.model.Team.hashCode(Team.java:20)
    at java.util.HashMap.hash(HashMap.java:351)
    at java.util.HashMap.put(HashMap.java:471)
    at java.util.HashSet.add(HashSet.java:217)
...

編輯：

感謝@Thihara 和@KarIP，我能夠解決這個問題。 我已經為 Team 和 League 覆蓋了 toString()，如下所示：

@Override
public String toString() {
    return "League [id=" + id + ", name=" + name + "]";
}

@Override
public String toString() {
    return "Team [id=" + id + ", name=" + name + "]";
}

並且能夠根據需要從數據庫中獲取數據。 但是在解析時，我得到了無限循環的 JAXB 錯誤。 所以我用@XmlAccessorType(XmlAccessType.FIELD)注釋了 Team and League class ，所以它不會查看方法，而 Team league字段為@XmlTransient ，所以它不會被解析。

在這里，我什至可以刪除我的 toString() 實現，它仍然有效。 我不完全確定為什么。 問題已解決，但我想聽聽更准確的解釋。 我不知道為什么 JAXB 停止數據獲取，即使它是在整個數據庫通信過程之后（或者不是？）。 更具體地說，我為此使用 Jersey ：

@GET
@Path("search/id")
@Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
public List<League> searchById(@QueryParam("id") int id) {
return Arrays.asList(leagueDAO.getById(id));
}

Answer 1

我有一個非常相似的問題。 我在模型對象上使用 Lombok 的@Data注釋來自動生成 getter、setter 和其他標准方法。 我相信 Lombok 生成的toString()方法在我的Team和League對象之間引入了循環依賴。 當我試圖從我的League對象中獲取Set<teams> teams ，我得到了一個java.lang.StackOverflowError因為 Spring 正在調用 toString 方法進行日志記錄。

我通過擺脫 Lombok 的toString()方法解決了這個問題。 我用 Lombok 的@Getter和@Setter注釋替換了@Data注釋。 這樣我仍然可以從免費的 getter 和 setter 中受益，而無需獲得toString()方法。

Answer 2

它可以拋出 StackOverFlow 的唯一方法是遞歸訪問您團隊的聯賽......

球隊對聯賽球隊對聯賽

我猜有一些函數試圖將您的對象反射或遞歸地轉換為其他表示形式，從而導致無限循環。

Answer 3

如果您使用@Data復雜注釋，循環依賴可以源自Lombok 的toString()自動生成方法。 要排除某個字段的循環依賴：

@Entity
@Data
public class Team {

  ...

  @ToString.Exclude
  @ManyToOne
  private League league;
}

Answer 4

我遇到此錯誤是因為我正在使用 jackson 將映射在@OneToMany和@ManyToOne兩側的對象列表解析為 json，這導致了無限循環。

如果您處於相同的情況，則可以使用@JsonManagedReference和@JsonBackReference注釋來解決此問題。

來自 API 的定義：

• JsonManagedReference（ https://fasterxml.github.io/jackson-annotations/javadoc/2.5/com/fasterxml/jackson/annotation/JsonManagedReference.html ）：

  用於指示被注釋的屬性是字段之間雙向鏈接的一部分的注釋； 並且它的作用是“父”（或“轉發”）鏈接。 屬性的值類型（類）必須有一個用 JsonBackReference 注釋的兼容屬性。 鏈接的處理使得用這個注解注解的屬性得到正常處理（正常序列化，反序列化沒有特殊處理）； 它是需要特殊處理的匹配反向引用

• JsonBackReference：（ https://fasterxml.github.io/jackson-annotations/javadoc/2.5/com/fasterxml/jackson/annotation/JsonBackReference.html ）：

  用於指示關聯屬性是字段之間雙向鏈接的一部分的注解； 並且它的作用是“子”（或“后”）鏈接。 屬性的值類型必須是 bean：不能是 Collection、Map、Array 或枚舉。 處理鏈接使得使用此注釋注釋的屬性不會被序列化； 並且在反序列化期間，它的值被設置為具有“托管”（前向）鏈接的實例。

例子：

所有者.java：

@JsonManagedReference
@OneToMany(mappedBy = "owner", fetch = FetchType.EAGER)
Set<Car> cars;

汽車.java：

@JsonBackReference
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "owner_id")
private Owner owner;

另一種解決方案是使用@JsonIgnore ，它只會為該字段設置 null 。

Answer 5

對我來說，Lombok 提供的 hashCode 和 toString 默認實現都導致了這個問題。

您可以使用此注釋通過單個注釋排除 equalsAndHasCode 的成員：

@EqualsAndHashCode(exclude = {"certificates", "payment"})

此外，如果您只想從 equals 方法中排除成員，Lombok 提供： @ToString.Exclude

@ToString.Exclude
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "shipment")
    private Set<Certificate> certificates;

Answer 6

我用 Lombok 的 @Getter 和 @Setter 注釋替換了 @Data 注釋

Answer 7

我有類似的問題，在我的情況下，這沒有任何幫助。

幫助了這種方法：

@OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "order_id")
@Fetch(value = FetchMode.SUBSELECT)
private List<Product> orderLines; 

name = "order_id" 是 Product 表中的外鍵列。

而且我沒有在 Product 實體中放入任何東西。

Answer 8

我掙扎了很長時間，並認為這是 Kotlin 的一個問題，為什么它會拋出 Stackoverflow 異常。 最后是傑克遜，它被 Spring Hibernate 使用並導致 Stackoverflow。

您可以通過在兩側設置@JsonIgnoreProperties來解決該問題。 例子：

public class ProductEntity implements Serializable {

private List<ProductPriceEntity> refProductPriceEntities = new ArrayList<>();

@OneToMany(
        mappedBy = "product",
        fetch = FetchType.LAZY,
        cascade = CascadeType.ALL,
        orphanRemoval = true,
        targetEntity = ProductPriceEntity.class)
  @JsonIgnoreProperties(value = "product", allowSetters = true)
  public List<ProductPriceEntity> getRefProductPriceEntities() {
    return refProductPriceEntities;
  }

  public void setRefProductPriceEntities(List<ProductPriceEntity> refProductPriceEntities) {
    this.refProductPriceEntities = refProductPriceEntities;
  }
}

最后是另一邊，這導致了stackoverflow異常。

public class ProductPriceEntity {

private ProductEntity product;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({
        @JoinColumn(name = "product_id", referencedColumnName = "id", nullable = false),
        @JoinColumn(name = "product_version_id", referencedColumnName = "version_id", nullable = false)
})
@JsonIgnoreProperties(value = "refProductPriceEntities", allowSetters = true)
public ProductEntity getProduct() {
    return product;
}

public void setProduct(ProductEntity product) {
    this.product = product;
}
}

Answer 9

當我遇到這個問題時，我正在將實體轉換為 dto。 然后我意識到我正在從用 manytoone 注釋的橋類調用用 onetomany 注釋的父類。 因為父級已經調用了橋，它變成了循環並且集合遞歸。 我沒有調用填充的父方法，而是在子中初始化並填充父方法。

Answer 10

另請參閱： Hibernate 在查詢時拋出 StackOverflowError

就我而言，我在一個實體上使用了@IdClass注釋，該實體將外鍵作為其主鍵的一部分：

@IdClass(MyEntity.MyEntityKey.class)
public class MyEntity {
   public static class MyEntityKey {
       private Foo parent;
       private int count;
       // Getters, setters, constructor, ...
   }

   @Id
   private Foo parent;
   @Id
   private int number;
  
   //...
}

現在，當加載Foo並急切加載所有MyEntity ，Hibernate 在構建導致堆棧溢出的鍵時再次加載父實體Foo 。

我通過使用顯式鍵屬性（即在MyEntityKey包含 Foo 的鍵，而不僅僅是對Foo的引用）對 id 進行建模來解決該問題，如復合鍵處理中所示， 在 Spring boot java 中使用 @Idclass 注釋（也適用於非春季休眠）。 簡而言之：使用@JoinColumns注釋來指定導航屬性（到父級）和 id 列之間的關系。

Answer 11

在休眠的 OneToOne 映射中出現此錯誤，實體類無法轉換為字符串。

Class A(Details.class)-
@OneToOne
@JoinColumn(name="billing_address_id")
private Address billingAddress;

@OneToOne
@JoinColumn(name="shipping_address_id")
private Address shippingAddress;


Class B(Address.class)-
@OneToOne(mappedBy="billingAddress")
private Details billingDetails;

@OneToOne(mappedBy="shippingAddress")
private Details shippingDetails;

錯誤 - 因為 A 類正在調用 B 類，類似地，B 類正在調用 A 類。需要刪除兩者之一。 那么這個問題就會得到解決。

Answer 12

當我遇到這個問題時，我可以使用@JsonManagedReference和@JsonBackReference解決它，但這意味着在反序列化為 json 時，只有實體的一側有子項。 即在您的球隊和聯賽示例中，只有聯賽會顯示球隊，而球隊不會顯示它屬於哪個聯賽。

要允許雙方， @JsonIdentityInfo在您的實體中使用@JsonIdentityInfo注釋並刪除@JsonBackReference和@JsonManagedReference 。 您的實體將類似於：

@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class Team {
...

這用我正在尋找的替換了循環引用。

Answer 13

我發現使用 @EqualsAndHashCode(onlyExplicitlyIncluded = true) 是一個很好的起點。 在大多數情況下，對象之間的相等性應該只對特定值進行。 如果你對每個實體都使用它，它將迫使你選擇你真正想要包含在平等中的內容，並且可能會阻止循環內存引用。

Answer 14

我在保存和刷新時使用 Lombok 遇到了類似的問題。 它在我的@EqualsAndHashCode 中，因此您可以按屬性名稱排除子集合：

@Data
@EqualsAndHashCode(callSuper = true, exclude = "childRowCollectionProp")
@Entity
@Table(name = "parent")
public class Parent extends BaseEntityWithId{

Answer 15

我在“Spring Data Rest”和 Lomboks @Data 注釋的組合中遇到了同樣的問題。 絕對同時使用@ToString.Exclude @EqualsAndHashCode.Exclude我的設置：

@RepositoryRestResource(collectionResourceRel = "a", path = "a")
public interface ARepository extends JpaRepository<A, Long> {
}

---

    @Data
    @JsonIgnoreProperties(ignoreUnknown = true)
    @Entity
    @EntityListeners(AuditingEntityListener.class)
    @EqualsAndHashCode(callSuper = true)
    public class A extends AuditMetadata<String> {
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        private Long id;
        private String x;
        private String y;

        @ToString.Exclude
        @EqualsAndHashCode.Exclude
        @ManyToOne
        private B b;
    
    }

---

@RepositoryRestResource(collectionResourceRel = "b", path = "b")
public interface BRepository extends JpaRepository<B, Long> {
}

---

    @Data
    @JsonIgnoreProperties(ignoreUnknown = true)
    @Entity
    @EqualsAndHashCode(callSuper = true)
    public class B extends AuditMetadata<String> {
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        private Long id;
        private String k;
        private String l;
        private String m;
        @OneToMany(mappedBy = "b", cascade = CascadeType.ALL)
        private Set<A> aList = new HashSet<>();
    }

---

這對我來說非常有效。 謝謝尼拉傑耆那教。