今天用spring boot +springdata jpa 构建项目，想在javaBean中直接创建数据库的表，因为一个表中的主键有两个，然后一开始按照网上的写法，一直出现这个错误。然后调试了一会原来是自己太马虎，先把报的错贴出来：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AssertionFailure: Subclass has to be binded after it's mother class: com.transportation.model.TruckAndPhoto
Caused by: org.hibernate.AssertionFailure: Subclass has to be binded after it's mother class: com.transportation.model.TruckAndPhoto
从字面意思也就是 ： 子类必须在母类之后绑定
然后先把错误的代码先拿出来：
Photo 类
@SuppressWarnings("serial")
@Entity
@Table(name = "Photo")
public class Photo extends TruckAndPhoto {
@EmbeddedId
private TruckAndPhoto photo_id;
@Column(name="photo_address")
private String photo_address;
@Override
public String toString() {
return "Photo [photo_id=" + photo_id + ", photo_address=" + photo_address + "]";
}
}
TruckAndPhoto 类
@Embeddable
@SuppressWarnings("serial")
public class TruckAndPhoto implements Serializable{
private int photo_id;
private int truck_id;
public TruckAndPhoto() {
super();
}
public TruckAndPhoto(int photo_id, int truck_id) {
super();
this.photo_id = photo_id;
this.truck_id = truck_id;
}
public int getPhoto_id() {
return photo_id;
}
public void setPhoto_id(int photo_id) {
this.photo_id = photo_id;
}
public int getTruck_id() {
return truck_id;
}
public void setTruck_id(int truck_id) {
this.truck_id = truck_id;
}
}
也就是 TruckAndPhoto类中的 photo_id和truck_id 为Photo 表的主键，也就是联合主键，然后报了错，一开始一直以为是没有重写equals和hashCode方法 ，最后才发现不是这个原因（原谅我是菜鸟），关键是出错在这里，上图：
这里的extends TruckAndPhoto 出了错 ，然后将extends TruckAndPhoto 该为implements Serializable 就对啦！
本文原创，转发请附上博主小名，谢谢~