ids para esta clase se deben asignar manualmente antes de llamar a save()

Question

Tengo algún problema con la asignación de Hibernate @OneToMany. Va como aquí

@Entity 
@Table(name = "albums") 
@SequenceGenerator(name = "ALBUMS_SEQ", sequenceName = "albums_seq", allocationSize = 1) 
public class AlbumDs { 

    @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ALBUMS_SEQ") 
    private Integer id; 
    private Integer ownerId; 
    private String name; 
    private String description; 
    private Date created; 
    @OneToMany(cascade = CascadeType.ALL) 
    @JoinColumn(name = "albumId", insertable = true, updatable = true) 
    private Set<UserAlbumDs> users = new HashSet<UserAlbumDs>(); 

    public Integer getId() { 
     return id; 
    } 
    public void setId(Integer id) { 
     this.id = id; 
    } 
    public Integer getOwnerId() { 
     return ownerId; 
    } 
    public void setOwnerId(Integer ownerId) { 
     this.ownerId = ownerId; 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public String getDescription() { 
     return description; 
    } 
    public void setDescription(String description) { 
     this.description = description; 
    } 
    public Date getCreated() { 
     return created; 
    } 
    public void setCreated(Date created) { 
     this.created = created; 
    } 
    public void setUsers(Set<UserAlbumDs> users) { 
     this.users = users; 
    } 
    public Set<UserAlbumDs> getUsers() { 
     return users; 
    } 
} 

UseraAlbumDs:

@Entity 
@Table(name = "users_albums") 
public class UserAlbumDs { 

    @Id 
    private Integer userId; 
    @Id 
    private Integer albumId; 

    public Integer getUserId() { 
     return userId; 
    } 
    public void setUserId(Integer userId) { 
     this.userId = userId; 
    } 
    public Integer getAlbumId() { 
     return albumId; 
    } 
    public void setAlbumId(Integer albumId) { 
     this.albumId = albumId; 
    } 
} 

Cuando llamo save(albumDs) me sale excepción:

SEVERE: Servlet.service() for servlet [main] in context with path [/Kronika] threw exception [Request processing failed; nested exception is org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): eu.patrykdobrowolski.model.hibernate.UserAlbumDs] with root cause 
org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): eu.patrykdobrowolski.model.hibernate.UserAlbumDs 
    at org.hibernate.id.Assigned.generate(Assigned.java:33) 
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:99) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70) 
    at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507) 
    at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499) 
    at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:218) 
    at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:268) 
    at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216) 
    at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169) 
    at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:296) 
    at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:242) 
    at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:219) 
    at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169) 
    at org.hibernate.engine.Cascade.cascade(Cascade.java:130) 
    at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:456) 
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:334) 
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181) 
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187) 
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172) 
    at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70) 
    at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535) 
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523) 
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519) 
    at eu.patrykdobrowolski.dao.hibernate.HibernateAlbumDao.create(HibernateAlbumDao.java:26) 
    at eu.patrykdobrowolski.service.impl.AlbumServiceImpl.createAlbum(AlbumServiceImpl.java:28) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) 

Por qué hibernación no puede assing los ids en su propio? ¿Qué pasa aquí?

Answer 1

Primero - no puede generarlos porque no le dijiste cómo hacerlo. Use @GeneratedValue y elija la estrategia que desee.

Luego, no puede tener dos campos @Id. Si desea un ID compuesto, use @EmbeddedId o @IdClass

Answer 2

Está utilizando dos claves principales en una tabla y una de ellas es también una clave principal en otra tabla. La solución más sencilla es eliminar una de las claves principales que es también la clave externa

Answer 3

que estaba enfrentando el mismo problema, pero lo que funcionó para mí fue

B oB = new B();  // Class B contains two objects of class A 

A oA1 = new A(); 
oA1.Name = "First"; 
oB.PlaceA1 = oA1; 

A oA2 = new A(); 
oA2.Name = "Second"; 
oB.PlaceA2 = oA2; 

cambiado a

B oB = new B();  // Class B contains two objects of class A 

A oA1 = new A(); 
oA1.ID = 1;   // This was missing(Manual Assignment of ID field) 
oA1.Name = "First"; 
oB.PlaceA1 = oA1; 

A oA2 = new A(); 
oA2.ID = 2;   // This was missing(Manual Assignment of ID field) 
oA2.Name = "Second"; 
oB.PlaceA2 = oA2;