带有 @EmbeddedId 的 StackOverflowError

Question

我有一个主类和一个辅助类，用于在保存时存储错误。\n错误可以有多种类型，主键是错误的主类和类型。\n这是我的类的映射：

\n\n

我的初级班：

\n\n

@Entity\n@Table(name = "foo")\npublic class FooEntity implements Serializable {\n\n    private static final long serialVersionUID = 1L;\n\n    @Id\n    @GeneratedValue\n    @Column(name = "id")    \n    private Integer id;\n\n    @Column(name = "param1") \n    private String param1;\n\n    @OneToMany(fetch = FetchType.LAZY, mappedBy = "id.foo", cascade = CascadeType.ALL)  \n    List<FooErrorEntity> errors;\n    //getters&setters\n}\n

\n\n

我的错误类别：

\n\n

@Entity\n@Table(name = "fooerror")\npublic class FooErrorEntity implements Serializable {\n\n    private static final long serialVersionUID = 1L;\n\n    @EmbeddedId\n    private FooErrorId id;\n\n    @Column(name = "descripcion")\n    private String description;\n\n    //Getters&& setters\n}\n

\n\n

我的错误 ID 类：

\n\n

@Embeddable\npublic class FooErrorId implements Serializable {\n\n    private static final long serialVersionUID = 1L;\n\n    @ManyToOne(fetch = FetchType.EAGER)\n    @JoinColumn(name = "foo_id", nullable = false)      \n    private FooEntity foo;\n\n    @Enumerated(EnumType.STRING)\n    @Column(name = "type")\n    private ErrorType type;\n\n    //getters&setters\n}\n

\n\n

在我的控制器中，我检查错误并将其添加到列表中：

\n\n

@RequestMapping(method = RequestMethod.POST)\npublic Final String saveFoo(@ModelAttribute("foo") FooEnntity foo) {

\n\n

//My checks... and add the errors\n\nFooErrorEntity error1 = new FooErrorEntity();\nerror1.setDescription("Desc1");\nFooErrorId errorId1 = new FooErrorId();\nerrorId1.setFoo(foo);\nerrorId1.setType(ErrorType.ERROR3);\nerror1.setId(errorId1);\n\nfoo.getErrors().add(error1);\n\nfooService.save(foo);\n\nreturn "view";\n

\n\n

}

\n\n

如果我正在编辑一个有错误的 FooEntity，则会出现以下错误：

\n\n

Hibernate: select errors0_.foo_id as foo_id3_2_0_, errors0_.type as type1_2_0_, errors0_.foo_id as foo_id3_2_1_, errors0_.type as type1_2_1_, errors0_.descripcion as descripc2_2_1_ from fooerror errors0_ where errors0_.foo_id=? Hibernate: select fooentity0_.id as id1_1_1_, fooentity0_.param1 as param2_1_1_, errors1_.foo_id as foo_id3_2_3_, errors1_.type as type1_2_3_, errors1_.foo_id as foo_id3_2_0_, errors1_.type as type1_2_0_, errors1_.descripcion as descripc2_2_0_ from foo fooentity0_ left outer join fooerror errors1_ on fooentity0_.id=errors1_.foo_id where fooentity0_.id=? .... Hibernate: select fooentity0_.id as id1_1_1_, fooentity0_.param1 as param2_1_1_, errors1_.foo_id as foo_id3_2_3_, errors1_.type as type1_2_3_, errors1_.foo_id as foo_id3_2_0_, errors1_.type as type1_2_0_, errors1_.descripcion as descripc2_2_0_ from foo fooentity0_ left outer join fooerror errors1_ on fooentity0_.id=errors1_.foo_id where fooentity0_.id=? Hibernate: select fooentity0_.id as id1_1_1_, fooentity0_.param1 as param2_1_1_, errors1_.foo_id as foo_id3_2_3_, errors1_.type as type1_2_3_, errors1_.foo_id as foo_id3_2_0_, errors1_.type as type1_2_0_, errors1_.descripcion as descripc2_2_0_ from foo fooentity0_ left outer join fooerror errors1_ on fooentity0_.id=errors1_.foo_id where fooentity0_.id=? Hibernate: select fooentity0_.id as id1_1_1_, fooentity0_.param1 as param2_1_1_, errors1_.foo_id as foo_id3_2_3_, errors1_.type as type1_2_3_, errors1_.foo_id as foo_id3_2_0_, errors1_.type as type1_2_0_, errors1_.descripcion as descripc2_2_0_ from foo fooentity0_ left outer join fooerror errors1_ on fooentity0_.id=errors1_.foo_id where fooentity0_.id=? mar 01, 2016 9:15:57 PM org.apache.catalina.core.StandardWrapperValve invoke GRAVE: El Servlet.service() para el servlet [dispatcher] en el contexto con ruta [/springMVC] lanz\xc3\xb3 la excepci\xc3\xb3n [Handler processing failed; nested exception is java.lang.StackOverflowError] con causa ra\xc3\xadz java.lang.StackOverflowError    at com.mysql.jdbc.Util.handleNewInstance(Util.java:428)     at com.mysql.jdbc.PreparedStatement.getInstance(PreparedStatement.java:834)     at com.mysql.jdbc.ConnectionImpl.clientPrepareStatement(ConnectionImpl.java:1573)   at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4591)     at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4489)\n\n    at org.apache.commons.dbcp.DelegatingConnection.prepareStatement(DelegatingConnection.java:281)     at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.prepareStatement(PoolingDataSource.java:313)    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:146)     at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:172)   at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:148)   at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1928)  at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1897)  at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1875)  at org.hibernate.loader.Loader.doQuery(Loader.java:919)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)   at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)   at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)   at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)\n\n\n    at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)   at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)   at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)   at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)\n\n    at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)   at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)   at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)   at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)   at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)   at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)   at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)  at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)  at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)     at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)    at\n> org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)\n\n    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)   at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:632)     at org.hibernate.type.EntityType.resolve(EntityType.java:424)   at org.hibernate.type.ComponentType.resolve(ComponentType.java:687)     at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:848)    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:714)     at org.hibernate.loader.Loader.processResultSet(Loader.java:972)    at org.hibernate.loader.Loader.doQuery(Loader.java:930)     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)  at org.hibernate.loader.Loader.loadEntity(Loader.java:2198)     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)  at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:50)  at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956)   at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:50

    

Answer 1

您有一个派生身份。

FooEntity.errors应该是“映射” foo：

public class FooEntity implements Serializable {
    ...
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "foo", cascade = CascadeType.ALL)  
    List<FooErrorEntity> errors;
    ...
}

FooErrorEntity的关系foo应从 移出@EmbeddedId并移至其@Entity本身，并且应指定@MapsId：

@Entity
@Table(name = "fooerror")
public class FooErrorEntity implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    private FooErrorId id;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "foo_id", nullable = false)      
    @MapsId("fooId") // maps fooId attribute of the embedded id
    private FooEntity foo;

    @Column(name = "descripcion")
    private String description;

    ...
}

并且FooErrorId'foo应该替换为fooId其类型对应于FooEntity' 的主键类型的 a ：

@Embeddable
public class FooErrorId implements Serializable {

    private static final long serialVersionUID = 1L;

    private Integer fooId; // type corresponds to FooEntity's id

    @Enumerated(EnumType.STRING)
    @Column(name = "type")
    private ErrorType type;

    ...
}

JPA 2.1 规范第 2.4.1 节讨论了派生身份。