获取错误的原因: org.hibernate.AnnotationException:使用@OneToMany或@ManyToMany作为未映射类的目标

Question

我是JPA/Hyperjaxb arena的新手。我的目标是在Author和Book表(postgres数据库)之间生成多对多映射。

在数据库中，Author表包含columns - id、name，Book表包含columns - id、title。我有一个连接(链接)表AUTHORS_BOOKS，它有列aid、bid (其中aid映射到Author表中的id字段，bid映射到Book表中的id字段)。

我们公开了一个webservice (让我们不要关注为什么是webservice)，以允许客户端查询/crud作者和图书。对于webservice，我使用hyperjaxb符号创建pojos (同样，它就是这样的)。

这是我的types.xsd文件：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

​

<xs:complexType name="author">
    <xs:sequence>
        <xs:element name="id" type="xs:long"/>
        <xs:element name="name" type="xs:string" />
        <xs:element name="books" type="tns:book" minOccurs="0" maxOccurs="1000"/>
    </xs:sequence>
</xs:complexType>

<xs:complexType name="book">
    <xs:sequence>
        <xs:element name="id" type="xs:long"/>
        <xs:element name="title" type="xs:string"/>
        <xs:element name="authors" type="tns:author" minOccurs="0" maxOccurs="1000"/>
    </xs:sequence>
</xs:complexType>

​

下面是bindings.xjb文件：

<?xml version="1.0" encoding="UTF-8"?>

​

<jaxb:bindings schemaLocation="sampletypes.xsd"
    node="/xs:schema">
    <jaxb:bindings node="xs:complexType[@name='author']">
        <hj:entity>
            <orm:table name="AUTHORS">
                <orm:unique-constraint>
                    <orm:column-name>NAME</orm:column-name>
                </orm:unique-constraint>
            </orm:table>
        </hj:entity>        
    </jaxb:bindings>

    <jaxb:bindings node="xs:complexType[@name='cocom']">
        <hj:entity>
               <orm:table name="BOOKS">
                     <orm:unique-constraint>
                            <orm:column-name>NAME</orm:column-name>
                     </orm:unique-constraint>
               </orm:table>
        </hj:entity>        
     </jaxb:bindings>

    <jaxb:bindings
            node="xs:complexType[@name='author']//xs:element[@name='books']">
                   <hj:many-to-many name="books">
                         <orm:join-table name="AUTHORS_BOOKS">
                                <orm:join-column name="aid" referenced-column-name="ID" />
                                <orm:inverse-join-column name="bid" referenced-column-name="ID" />
                         </orm:join-table>
                   </hj:many-to-many>
     </jaxb:bindings>

     <jaxb:bindings
                node="xs:complexType[@name='book']//xs:element[@name='authors']">
                       <hj:many-to-many name="authors" mappedBy="books">
                       <hj:cascade>
                       <hj:cascade-persist/>
                       </hj:cascade>
                       </hj:many-to-many>
      </jaxb:bindings>

    <jaxb:bindings
        node="xs:complexType[@name='author']//xs:element[@name='id']">
        <hj:id>
            <orm:generated-value strategy="AUTO" />
        </hj:id>
    </jaxb:bindings>

    <jaxb:bindings
        node="xs:complexType[@name='book']//xs:element[@name='id']">
        <hj:id>
            <orm:generated-value strategy="AUTO" />
        </hj:id>
    </jaxb:bindings>

</jaxb:bindings>

​

下面是生成的Author.java的(一部分)：

 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "author", propOrder = {
"id",
"name",
"books"
})
@Entity(name = "Author")
@Table(name = "AUTHOR", uniqueConstraints = {
@UniqueConstraint(columnNames = {
    "NAME"
})
})
 @Inheritance(strategy = InheritanceType.JOINED)
 public class Author
implements Serializable, Equals, HashCode, ToString
{

 //some othe stuff

@ManyToMany(targetEntity = Book.class, cascade = {
    CascadeType.ALL
})
@JoinTable(name = "AUTHORS_BOOKS", joinColumns = {
    @JoinColumn(name = "aid", referencedColumnName = "ID")
}, inverseJoinColumns = {
    @JoinColumn(name = "bid", referencedColumnName = "ID")
})
public List<Book> getBooks() {
    if (books == null) {
        books = new ArrayList<Book>();
    }
    return this.books;
}

}

下面是生成Book.java的(部分)代码：

 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "book", propOrder = {
"id",
"title",
"authors"
})
@Entity(name = "Book")
@Table(name = "BOOK", uniqueConstraints = {
@UniqueConstraint(columnNames = {
    "NAME"
})
})

@Inheritance(strategy = InheritanceType.JOINED)
public class Book
implements Serializable, Equals, HashCode, ToString
{

private final static long serialVersionUID = 1L;
protected long id;
@XmlElement(required = true)
protected String title;
protected List<Author> authors;

/**
 * Gets the value of the id property.
 * 
 */
@Id
@Column(name = "ID", scale = 0)
@GeneratedValue(strategy = GenerationType.AUTO)
public long getId() {
    return id;
}

/**
 * Sets the value of the id property.
 * 
 */
public void setId(long value) {
    this.id = value;
}

@Basic
@Column(name = "NAME_", length = 255)
public String getName() {
    return name;
}

public void setName(String value) {
    this.name = value;
}

@ManyToMany(targetEntity = Book.class, cascade = {
    CascadeType.ALL
})
@JoinTable(name = "AUTHORS_BOOKS", joinColumns = {
    @JoinColumn(name = "PARENT_AUTHOR_ID")
}, inverseJoinColumns = {
    @JoinColumn(name = "CHILD_BOOK_ID")
})
public List<Book> getBooks() {
    if (books == null) {
        books = new ArrayList<Book>();
    }
    return this.books;
}

我不确定我做错了什么，但当我将war文件部署到tomcat (7.0.34，也尝试了其他7.0.x版本)时，我得到了以下错误

Error Message: 
Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class:com.mycompany.Author.books[com.mycompany.Book]

我一直在网上搜索答案，要么没有解决方案，要么大多数错误是由于@ManyToMany标签中缺少@Entity或@Id或targetEntity字段造成的。在这方面我真的需要一些指点！非常感谢您的时间和帮助！谢谢。

Answer 1

感谢大家的帮助！事实证明这是一个映射问题。在/src/main/resources/persistence.xml文件中，我忘记添加完整的类路径(对于Book.java)，所以Hibernate找不到它。因此，这更多的是一个集成问题。再次感谢您的帮助！

Answer 2

问题是，为什么Hibernate认为com.mycompany.Book是未映射的。

我怀疑有重复类或类似的问题。首先尝试运行隔离往返测试(HJ3对此提供了一些支持)。这显然与Tomcat版本等无关。

Answer 3

都是一样的。List out我愚蠢到在oneToMany类中编写TUrns而不是List...