java - 尽管在 Hibernate 映射文件中访问了 ="field"，Hibernate 仍在寻找 setter

Question

我收到以下错误:

PropertyNotFoundException: Could not find a setter for property firstName in class com.example.SpecialUser

尽管在我的 SpecialUser.hbm.xml 文件中将“default-access”和“access”设置为“field”:

<hibernate-mapping package="com.example" default-cascade="all" default-access="field">
<joined-subclass extends="User" name="com.example.SpecialUser" table="special_user" lazy="false">
    <key column="user_id"/>
    <property name="firstName" column="first_name" type="java.lang.String" access="field" />
</joined-subclass>
</hibernate-mapping>

SpecialUser 类:

public class SpecialUser extends User {

    private static final long serialVersionUID = 101162430966683621L;

    private String firstName;

    public SpecialUser() {
        super();
    }

    public String getFirstName() {
        return this.firstName;
    }

}

用户 hibernate 映射文件:

<class name="User" table="user" lazy="false">
    <id name="userId" column="user_id" type="java.lang.String">
        <generator class="assigned"></generator>
    </id> 

    <property name="password" column="password" type="java.lang.String" />
</class>

Answer 1

如果您在较大的项目中遇到此问题，我建议您创建一个剥离项目，该项目仅具有持久化实体所需的基本配置并从那里开始。乍一看，您的配置唯一看起来奇怪的是 User 类没有包声明。

在所有测试中，我将 User 类移至 com.example 包中并修改 *.hbm.xml 文件以匹配该更改。

测试 1

• Hibernate 3.6.10.Final
• Spring 4.0.6.RELEASE [LocalSessionFactoryBean]
• context.xml(如下)

结果:编译并运行简单的持久性测试。

测试 2

• Hibernate 3.6.10.Final。
• hibernate.cfg.xml(如下)

结果:编译并运行简单的持久性测试。

测试3

• hibernate 3.3.1.GA。
• hibernate.cfg.xml(如下)

结果:编译并运行简单的持久性测试。

您能否在项目之外执行类似的测试？如果您能够重现该错误，请提供重现该小测试所需的信息。

下面的完整代码用于比较。

<小时/>用户.java

package com.example;

import java.io.Serializable;

public class User implements Serializable {
    private static final long serialVersionUID = -7240509760819729807L;

    private String userId;
    private String password;

    public User() {
    }

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

用户.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.example.User" table="user" lazy="false">
        <id name="userId" column="user_id" type="java.lang.String">
            <generator class="assigned"></generator>
        </id>

        <property name="password" column="password" type="java.lang.String" />
    </class>
</hibernate-mapping>

SpecialUser.java

package com.example;

public class SpecialUser extends User {
    private static final long serialVersionUID = 101162430966683621L;

    private String firstName;

    public SpecialUser() {
        super();
    }

    public String getFirstName() {
        return this.firstName;
    }
}

SpecialUser.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.example" default-cascade="all" >
    <joined-subclass extends="com.example.User" name="com.example.SpecialUser" table="special_user" lazy="false">
        <key column="user_id" />
        <property name="firstName" column="first_name" type="java.lang.String" access="field" />
    </joined-subclass>
</hibernate-mapping>

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>
        <property name="hbm2ddl.auto">create</property> 
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>       
        <property name="connection.url">jdbc:hsqldb:mem:testdb</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>

        <mapping resource="model/User.hbm.xml" />
        <mapping resource="model/SpecialUser.hbm.xml" /> 
    </session-factory>
</hibernate-configuration>

上下文.xml

<?xml version="1.0" encoding="UTF-8"?>       
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd">

    <jdbc:embedded-database id="dataSource" />

    <bean id="sessionFactory" primary="true" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>
                <prop key="hibernate.hbm2ddl.auto">create</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>

        <property name="mappingLocations">
            <list>
                <value>model/SpecialUser.hbm.xml</value>
                <value>model/User.hbm.xml</value>
            </list>
         </property>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean> 

</beans>