Hibernate Envers因@Converter和AttributeConverter失败(JPA 2.1)

时间:2014-03-12 17:10:57

标签: java hibernate jpa hibernate-envers jpa-2.1

我正在使用带有Envers的Hibernate 4.3.4和MySql 5.6。

如果没有JPA 2.1转换器,下面的Party实体会在Configuration.buildSessionFactory()处失败,因为Hibernate不知道如何处理Name类:

@Entity
@Audited
public class Party
    {
    protected Name name;
    ...
    }

例外是:

org.hibernate.MappingException: 
  Could not determine type for: 
    ModuloADM.Party.Name, 
    at table: Party, for columns: [org.hibernate.mapping.Column(name)]

要解决此问题,我会添加此转换器:

@Converter (autoApply=true)
public class NametoStringConverter
      implements AttributeConverter<Name, String>
    { ... }

现在异常改为:

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)]

现在,Party实体的Envers审核表失败了。请注意,History_Party是审核表的名称,由config.setProperty("org.hibernate.envers.audit_table_prefix", "History_")选择。

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)

我该如何解决这个问题? Envers甚至与AttributeConverters兼容吗?

4 个答案:

答案 0 :(得分:1)

尝试在Party实体中使用@Convert。有时autoApply标志不起作用

@Entity
@Audited
public class Party
    {
    @Convert(converter = NametoStringConverter.class)
    protected Name name;
    ...
    }

答案 1 :(得分:1)

这似乎是known problem with Hibernate Envers (HHH-9042)

一个简单的解决方法是手动调用Convter和一个额外的瞬态字段,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;
  }

}

根据转化功能,可以通过制作static并导入代码来进一步简化代码。

答案 2 :(得分:0)

我在异常中看到了文本“GeneratedConstructorAccessor43”。可能是您需要一个公共的void构造函数,以便JPA可以创建NametoStringConverter的实例。

默认构造函数应该可以工作,但要检查是否有另一个带有receive参数的构造函数,或者不是public。

答案 3 :(得分:0)

我遇到了同样的问题,我发现它只是在我没有将@Column注释与columnDefinition =“VARCHAR(255)”放到枚举时才发生。所以我认为这比hibernate跟踪器更好。