java - JPA - 在模型中使用注解

Question

我的应用程序在 JPA/Hibernate、Spring 和 Wicket 上运行。我正在尝试将我们的 ORM 从 XML 文件转换为 JPA 注释。带注释的模型如下所示:

@Entity
@Table(name = "APP_USER")
public class User extends BaseObject {
    private Long id;
    private String firstName;
    private String lastName;
    private String email;

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    @Column(name = "ID")
    public Long getId() {
        return id;
    }

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

    @Column(name="FIRST_NAME")
    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    @Column(name="LAST_NAME")
    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    @Column(name="EMAIL")
    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    /**
     * @return Returns firstName and lastName
     */
    public String getFullName() {
        return firstName + ' ' + lastName;
    }
}

虽然最初，它没有注释，映射在 User.hbm.xml 中描述:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="org.appfuse.model.User" table="app_user">
        <id name="id" column="id" unsaved-value="null">
            <generator class="increment"/>
        </id>
        <property name="firstName" column="first_name" not-null="true"/>
        <property name="lastName" column="last_name" not-null="true"/>
        <property name="email" column="email"/>
    </class>
</hibernate-mapping>

当我删除映射文件并尝试仅使用注释时，entityManagerFactory 不会被创建，但有一个异常(exception)

org.hibernate.PropertyNotFoundException: Could not find a setter for property fullName in class org.appfuse.model.User.

没有为此属性设置映射，因为它只是一个方便的方法。我做错了什么？

Answer 1

将方法标记为@Transient所以 Hibernate 会忽略它:

/**
 * @return Returns firstName and lastName
 */
@Transient
public String getFullName() {
    return firstName + ' ' + lastName;
}

默认情况下，所有看起来像 getter 的东西都会被映射。