为同一个Hibernate二级缓存区域映射两个CacheConcurrencyStrategy

Question

我为单个区域设置了不同的缓存策略，如“读写”和“只读”用法，当我尝试更新Carro Entity时，抛出以下异常：

错误org.hibernate.internal.SessionImpl - HHH000346：托管刷新期间出错[无法写入只读对象]

线程“main”中的异常java.lang.UnsupportedOperationException：无法写入只读对象

如果我将不同地区的实体分开工作。 那么，在同一地区不能有两种不同类型的策略？

Ps。：接收此警告：HHH020007：为可变实体配置的只读缓存

---

- > Carro：

@Entity
@Table(name = "carro")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = "myregion")
public class Carro implements Serializable
{ 
     private static final long serialVersionUID = 8467432396096896736L;

     @Id
     @Column(name = "id")
     private Integer id;

     @Column(name = "carro")
     private String carro;

     @OneToMany(mappedBy = "carro", fetch = FetchType.LAZY)
     private List<Pessoa> pessoas = new ArrayList<Pessoa>();
}

- >佩索阿：

@Entity
@Table(name = "pessoa")
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY, region = "myregion")
public class Pessoa implements Serializable
{
    private static final long serialVersionUID = 8467432396096896736L;

    @Id
    @Column(name = "id")
    private Integer id;

    @Column(name = "nome")
    private String Nome;

    @Column(name = "sexo")
    private String sexo;

    @Column(name = "idade")
    private Integer idade;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "carro_id")
    private Carro carro;
}

- > ehcache.xml：

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="false"
         monitoring="autodetect" dynamicConfig="true">

    <cache name="myregion" maxEntriesLocalHeap="1000" eternal="false" timeToLiveSeconds="1000">
        <persistence strategy="none"/>
    </cache>

    <cache name="org.hibernate.cache.internal.StandardQueryCache" maxEntriesLocalHeap="1000" eternal="false" timeToLiveSeconds="120">
        <persistence strategy="none"/>
    </cache>

    <cache name="org.hibernate.cache.spi.UpdateTimestampsCache" maxEntriesLocalHeap="1000" eternal="true">
        <persistence strategy="none"/>
    </cache>
</ehcache>

Answer 1

该区域必须具有单个CacheConcurrencyStrategy 。 在您的情况下， Pessoa类必须在Carro之后注册，因此myregion设置为READ_ONLY 。

默认情况下，每个实体都有不同的区域工厂，因此您可以基于每个实体设置不同的CacheConcurrencyStrategy 。