[英]Hibernate Envers fails with @Converter and AttributeConverter (JPA 2.1)
I am using Hibernate 4.3.4 with Envers, and MySql 5.6.我正在使用带有 Envers 的 Hibernate 4.3.4 和 MySql 5.6。
Without a JPA 2.1 converter, the Party
entity below fails at Configuration.buildSessionFactory()
as it should, since Hibernate doesn't know what to do with the Name class:如果没有 JPA 2.1 转换器,下面的
Party
实体会在Configuration.buildSessionFactory()
失败,因为 Hibernate 不知道如何处理名称 class:
@Entity
@Audited
public class Party
{
protected Name name;
...
}
The exception is:例外是:
org.hibernate.MappingException:
Could not determine type for:
ModuloADM.Party.Name,
at table: Party, for columns: [org.hibernate.mapping.Column(name)]
To fix this, I then add this converter:为了解决这个问题,我添加了这个转换器:
@Converter (autoApply=true)
public class NametoStringConverter
implements AttributeConverter<Name, String>
{ ... }
And the exception now changes to:异常现在变为:
org.hibernate.MappingException:
Could not determine type for:
BasicType adapter for AttributeConverter<Name,String>,
at table: History_Party, for columns: [org.hibernate.mapping.Column(name)]
This is now failing at the Envers auditing table for the Party
entity.现在,这在
Party
实体的 Envers 审计表中失败了。 Note that History_Party
is the name of the audit table, as chosen by config.setProperty("org.hibernate.envers.audit_table_prefix", "History_")
.请注意,
History_Party
是审计表的名称,由config.setProperty("org.hibernate.envers.audit_table_prefix", "History_")
选择。
The complete stacktrace is:完整的堆栈跟踪是:
org.hibernate.MappingException:
Could not determine type for:
BasicType adapter for AttributeConverter<Name,String>,
at table: History_Party, for columns: [org.hibernate.mapping.Column(name)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:336)
at org.hibernate.tuple.PropertyFactory.buildEntityBasedAttribute(PropertyFactory.java:246)
at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:227)
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:520)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:148)
at sun.reflect.GeneratedConstructorAccessor43.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:163)
at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:135)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:401)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1857)
How do I solve this?我该如何解决这个问题? Is Envers even compatible with AttributeConverters?
Envers 甚至与 AttributeConverters 兼容吗?
Try using @Convert in Party
Entity. 尝试在
Party
实体中使用@Convert。 Sometimes autoApply
flag will not work 有时
autoApply
标志不起作用
@Entity
@Audited
public class Party
{
@Convert(converter = NametoStringConverter.class)
protected Name name;
...
}
This seems to be a known problem with Hibernate Envers (HHH-9042) . 这似乎是休眠Envers(HHH-9042)的已知问题 。
A simple workaround would be a manual invocation of the Convter and an additional transient field, like this: 一个简单的解决方法是手动调用Convter和其他瞬态字段,如下所示:
@Entity
public class Party {
protected Name name;
@Transient
protected String nameString;
//...
public void setName(Name name) {
this.nameString = (new NametoStringConverter()).convertToDatabaseColumn(name);
this.name = name;
}
//...
public void setNameString(String nameString) {
this.name = (new NametoStringConverter()).convertToEntityAttribute(nameString);
this.nameString = nameString;
}
}
Depending on the conversion functions, the code could be further simplified by making them static
and importing them. 根据转换功能的不同,可以通过将其设置为
static
并导入来进一步简化代码。
I see the text "GeneratedConstructorAccessor43" in the exception. 我在例外中看到了文本“ GeneratedConstructorAccessor43”。 May be you need a public void constructor so that JPA can create an instance of NametoStringConverter.
可能是您需要一个公共void构造函数,以便JPA可以创建NametoStringConverter的实例。
The default constructor should work but check if you have another one with receives parameters or not public. 默认的构造函数应该可以工作,但是请检查您是否有另一个带有接收参数的对象,或者是否不公开。
I had the same problem, what I found out that it only occured when I didn't put the @Column annotation with columnDefinition = "VARCHAR(255)" to the Enum. 我遇到了同样的问题,发现它仅在没有将带有columnDefinition =“ VARCHAR(255)”的@Column注释放入枚举时才发生。 So I think that is a better work around than what in hibernate tracker has.
因此,我认为这是比休眠跟踪器更好的解决方法。
In case you need to specify a column name for the column (in this example "C_NAME") you need to add @Column annotation.如果您需要为列指定列名(在此示例中为“C_NAME”),则需要添加 @Column 注释。
@Entity
@Audited
public class Party
{
@Convert(converter = NametoStringConverter.class)
@Column( name = "C_NAME" )
protected Name name;
...
}
Note below code will not work and will result in "Could not determine type for: " error because Converter annotation will be ignored.注意下面的代码将不起作用,并会导致“无法确定类型:”错误,因为转换器注释将被忽略。
@Entity
@Audited
public class Party
{
@Convert(converter = NametoStringConverter.class)
@Column( name = "C_NAME", nullable=true ) // DOESN'T WORK
protected Name name;
...
}
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