在使用spring data jpa时,实体类如下:
@Data
@Entity
public class User {
/** 编号 */
private Integer id;
/** 姓名 */
private String name;
/** 年龄 */
private Integer age;
public User(){
}
}
这里的其他层代码就不贴了,运行主函数报错:
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.AnnotationException: No identifier specified for entity: com.example.bean.User
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
........
网上很多有接种说法,但都解决不了,比如:说添加什么hibernate-entitymanager依赖,没有作用,经过一番思考,原因是在编写实体User时,没有为id标注上主键的注解@Id,发现加上之后就没有报错了。
@Data
@Entity
public class User {
/** 编号 */
@Id
private Integer id;
/** 姓名 */
private String name;
/** 年龄 */
private Integer age;
public User(){
}
}
看看你的实体有没有标注@Id主键的注解,运行项目: