java为什么Hibernate试图映射@Transient方法？

Question

我有一个带注释的实体POJO，我正试图与Hibernate一起使用

该类有许多名为getX的业务逻辑方法。我已经用@Transient注释对它们进行了注释，示例来源如下：

import java.beans.Transient;
import java.util.Collection;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class TestEntity {

    private String id;

    @Id
    public String getId()
    {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    @Transient
    public Collection<String> getAllGames()
    {
        return null;
    }
}

然而，Hibernate似乎仍在尝试映射这些方法。初始化Hibernate时输出以下错误：

org.hibernate.MappingException: Could not determine type for: java.util.Collection, at table: TestEntity, for columns: [org.hibernate.mapping.Column(allGames)] at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:455) at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:422) at org.hibernate.mapping.Property.isValid(Property.java:226) at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:597) at org.hibernate.mapping.RootClass.validate(RootClass.java:265) at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:329) at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:451) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:710) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726) ...

Hibernate是使用<mapping class="...">项配置的：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM 
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
   <session-factory>
       <property name="hibernate.dialect">
          org.hibernate.dialect.DerbyTenSevenDialect
       </property>
       <property name="hibernate.connection.driver_class">
          org.apache.derby.jdbc.EmbeddedDriver
       </property>

       <property name="hibernate.connection.url">
          jdbc:derby:db
       </property>

       <!-- Disable the second-level cache  -->
       <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

       <property name="hibernate.hbm2ddl.auto">update</property>
       <property name="show_sql">true</property>

       <mapping class="TestEntity"/>

    </session-factory>
</hibernate-configuration>

我正在用Hibernate 5.2.10运行。决赛

为什么Hibernate试图映射这种临时方法

Answer 1

@Transient注释来自错误的包：

import java.beans.Transient;

它们应该来自javax.persistence包：

import javax.persistence.Transient;

另见：Do javax.persistence.transient and java.bean.transient do the same thing?