Question

我在通过ANT构建脚本为我的模型生成泛型时遇到了这个错误：

Internal Exception: Exception [EclipseLink-7161] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Entity class [class com.ckd.model.BookModel] has no primary key specified. It should define either an @Id, @EmbeddedId or an @IdClass. If you have defined PK using any of these annotations then make sure that you do not have mixed access-type (both fields and properties annotated) in your entity class hierarchy.

这是我的实体类：

@Entity
@Table(name = "BOOK")
public class BookModel implements Serializable
{
    private static final long serialVersionUID = 1L;

//  @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID", unique = true, nullable = false)
    private Long id;

    @Id
    @NotNull
    @Size(min = 32, max = 32)
    @Column(name = "HASHID", unique = true, nullable = false)
    private String hashid;

    @NotNull
    @Size(min = 1, max = 255)
    @Column(name = "TITLE")
    public String title;

    @NotNull
    @Size(min = 1, max = 255)
    @Column(name = "AUTHOR")
    private String author;

    @Lob
    @NotNull
    @Column(name = "CONTENT")
    private String content;

    @Size(min = 2, max = 3)
    @Column(name = "LANG")
    public String lang; 

    // getters and setters here
}

我也将此添加到我的实体中，但没有区别：

@Entity
@Access(AccessType.FIELD)

针对Glassfish 3.1附带的捆绑EclipseLink库或使用http://www.eclipse.org/eclipselink/downloads/中的EclipseLink v2.x.x独立库构建我的项目也没有任何区别 - 仍然遇到上述错误。

根据Java EE项目要求，我的persistence.xml位于WebContent\META-INf目录下。它的内容是：

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
    version="2.0">   
    <persistence-unit name="persistentUnit" transaction-type="JTA">
        <description>Persistent Unit for Entity Classes</description>
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <jta-data-source>jdbc/prod1</jta-data-source>
        <class>com.ckd.model.BookModel</class>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <properties>
            <property name="eclipselink.jdbc.DBDictionary" value="mysql(DriverVendor=mysql)" />
            <property name="eclipselink.target-database" value="org.eclipse.persistence.platform.database.MySQLPlatform" /> 
            <property name="eclipselink.jdbc.DBDictionary" value="searchStringEscape=\\" /> 
            <property name="eclipselink.jdbc.QuerySQLCache" value="false" />
            <property name="eclipselink.weaving" value="false" /> 
            <property name="eclipselink.logging.logger" value="org.eclipse.persistence.logging.DefaultSessionLog" />
            <property name="eclipselink.logging.level" value="FINEST" /> 
        </properties>
    </persistence-unit>
</persistence>

如何解决此错误？这是EclipseLink 2.x.x的当前实现的错误吗？

Answer 1

orm.xml中的一个未使用的实体条目导致了上述错误。注释掉未使用的实体条目，修复了上述错误。

Answer 2

您必须取消注释班级中的@Id注释

private static final long serialVersionUID = 1L;

//  @Id   <------ HERE
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID", unique = true, nullable = false)
private Long id;
......

JPA 2：EclipseLink Ant构建错误

2 个答案: