org.hibernate.AnnotationException：使用@OneToMany 或@ManyToMany 定位未映射的 class

Question

我正在尝试对产品规格使用 onetomany 映射，我从描述中复制了类似的工作代码。我提供我所有的代码。

Caused by: javax.persistence.PersistenceException: [PersistenceUnit: sm-unit] Unable to build EntityManagerFactory
        at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:915)
        at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:890)
        at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:74)
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:257)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
        ... 38 more
Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: com.salesmanager.core.business.catalog.product.model.Product.specifications[com.salesmanager.core.business.catalog.product.model.specification.ProductSpecification]
        at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1204)

Product.java 有这样的条目：

@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.REMOVE, mappedBy = "product")
    private Set<ProductSpecification> specifications = new HashSet<ProductSpecification>();

ProductSpecification.java 有以下代码..

@Entity
@Table(name = "PRODUCT_SPECIFICATION", schema=SchemaConstant.BEAWLP_JAMBIRA_SCHEMA)
public class ProductSpecification extends SalesManagerEntity<Long, ProductSpecification> {
    private static final long serialVersionUID = -7991123525661321865L;

    @ManyToOne(targetEntity = Product.class)
    @JoinColumn(name = "PRODUCT_ID", nullable = false)
    private Product product;

@Id
@Column(name = "SPECIFICATION_ID", unique = true, nullable = false)
@TableGenerator(name = "TABLE_GEN", table = "SM_SEQUENCER", pkColumnName = "SEQ_NAME", valueColumnName = "SEQ_COUNT", pkColumnValue = "SPECIFICATION_SEQ_NEXT_VAL")
@GeneratedValue(strategy = GenerationType.TABLE, generator = "TABLE_GEN")
private Long id;

@Column(name="TITLE", length=100)
private String title;

public ProductSpecification() {
}

public Product getProduct() {
    return product;
}

public void setProduct(Product product) {
    this.product = product;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public Long getId() {
    return id;
}

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

Answer 1

我想你错过了 targetEntity，试试下面这行它可能对你有帮助。

@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.REMOVE, mappedBy = "product", targetEntity = ProductSpecification.class)
private Set<ProductSpecification> specifications = new HashSet<ProductSpecification>();

Answer 2

从报错信息可知实体映射不正确

确保您导入的是 javax.persistence.entity 而不是 org.hibernate.annotations.entity。
另外，确保该实体在配置文件中列出（persistence.xml、hibernate.cfg.xml）。

Answer 3

我注意到在使用 Set 和 HashSet 时会出现异常。您可以改为使用 List 和 ArrayList

@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.REMOVE, mappedBy = "product")
private List<ProductSpecification> specifications = new ArrayList<ProductSpecification>();

Answer 4

对我来说，通过将 class 添加到

来修复它

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="sample" />
    <property name="annotatedClasses">
        <list>
            <value>******************</value>

org.hibernate.AnnotationException：使用@OneToMany 或@ManyToMany 定位未映射的 class

org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class

java

hibernate

jpa

one-to-many