我是新来的 hibernate 。我正在尝试使用@CollectionId
生成我的Address类的标识符。我已经为此使用Collection
接口(interface)。但是,当我使用@GenericGenerator
并将策略设置为hilo时,它将引发异常。
这是我的代码:
@Entity
@Table(name = "USER_DETAILS")
public class UserDetails {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int userId;
private String userName;
@ElementCollection
@JoinTable(name="USER_ADDRESS",
joinColumns=@JoinColumn(name="USER_ID")
)
@GenericGenerator(name = "hilo-gen", strategy = "hilo")
@CollectionId(columns = { @Column(name="ADDRESS_ID") }, generator = "hilo-gen", type = @Type(type="long"))
private Collection<Address> address = new ArrayList<Address>();
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Collection<Address> getAddress() {
return address;
}
public void setAddress(List<Address> address) {
this.address = address;
}
}
我得到以下异常:
Exception in thread "main" org.hibernate.MappingException: Could not instantiate id generator [entity-name=null]
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:121)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:259)
at org.hibernate.persister.collection.AbstractCollectionPersister.<init>(AbstractCollectionPersister.java:429)
at org.hibernate.persister.collection.BasicCollectionPersister.<init>(BasicCollectionPersister.java:57)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.hibernate.persister.internal.PersisterFactoryImpl.createCollectionPersister(PersisterFactoryImpl.java:152)
at org.hibernate.persister.internal.PersisterFactoryImpl.createCollectionPersister(PersisterFactoryImpl.java:140)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:408)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:708)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)
at com.hbt.HibernateTest.main(HibernateTest.java:35)
Caused by: java.lang.UnsupportedOperationException: Support for 'hilo' generator has been removed
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.getIdentifierGeneratorClass(DefaultIdentifierGeneratorFactory.java:132)
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:112)
... 14 more
我正在使用最新的 hibernate 模式。我应该怎么办?
最佳答案
不再支持Hilo,这应该可以工作
@GenericGenerator(name="sequence-gen",strategy="sequence")
关于java - HiLo生成器策略不起作用,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/33103355/