Hibernate Envers使用@Converter和AttributeConverter失败（JPA 2.1） [英] Hibernate Envers fails with @Converter and AttributeConverter (JPA 2.1)

问题描述

我在Envers和MySql 5.6中使用Hibernate 4.3.4。

没有JPA 2.1转换器， Party 下面的实体在 Configuration.buildSessionFactory（）时会失败，因为Hibernate不知道如何处理Name类：

  @Entity 
 @Audited 
公共类派对
 {
受保护的名称名称; 
 ... 
} 
  

例外情况是：

  org.hibernate.MappingException：
无法确定类型：
 ModuloADM.Party.Name，
 at table：Party，列：[org.hibernate.mapping.Column（name）] 
  

这个，然后我添加这个转换器：

$ $ p $ $ $ $ c $ @ $ $ $ $ $ b $ public class NametoStringConverter
实现了AttributeConverter< Name，String>
{...}

现在异常变为：

  org.hibernate.MappingException：
无法确定类型：
 AttributeConverter的BasicType适配器< Name，String> ;, $表格中的b $ b：History_Party，列：[org.hibernate.mapping.Column（name）] 
  

现在，在 Party 实体的Envers审计表中失败。请注意， History_Party 是审计表的名称，由 config.setProperty（org.hibernate.envers.audit_table_prefix，History_ ）。

完整的堆栈跟踪是：

 无法确定类型：
 AttributeConverter的BasicType适配器< Name，String>，
表：History_Party，列：[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 （构造函数.java:525）$ b $。 $ b 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甚至可以与AttributeConverters兼容吗？

这似乎是 Hibernate Envers的已知问题（HHH-9042）。

解决方法是手动调用Convter和一个额外的临时字段，如下所示：

  @Entity 
 public class派对{
 
受保护的名称; 
 
 @Transient 
保护字符串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; 
} 
 
} 
  

根据转换函数，可以通过使代码 static 并导入它们来进一步简化代码。

I am using Hibernate 4.3.4 with Envers, and 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:

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

The exception is:

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:

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

And the exception now changes to:

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. Note that History_Party is the name of the audit table, as chosen by config.setProperty("org.hibernate.envers.audit_table_prefix", "History_").

The complete stacktrace is:

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? Is Envers even compatible with AttributeConverters?

解决方案

This seems to be a known problem with Hibernate Envers (HHH-9042).

A simple workaround would be a manual invocation of the Convter and an additional transient field, like this:

@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 staticand importing them.

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