考虑在您的配置中定义一个类型为'javax.persistence.EntityManagerFactory'的bean

Question

package com.example;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.persistence.EntityManagerFactory;

@Configuration
public class BeanConfig {

    @Autowired
    EntityManagerFactory emf;

    @Bean
    public SessionFactory sessionFactory(@Qualifier("entityManagerFactory") EntityManagerFactory emf) {
        return emf.unwrap(SessionFactory.class);
    }

}

Error
***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of method sessionFactory in com.example.BeanConfig required a bean of type 'javax.persistence.EntityManagerFactory' that could not be found.


Action:

Consider defining a bean of type 'javax.persistence.EntityManagerFactory' in your configuration.


Process finished with exit code 1

Answer 1

如果包括以下内容：

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

您不必自动调用实体管理器或提供会话工厂bean。

您只需要提供JpaRepository接口，如下所示：

public interface ActorDao extends JpaRepository<Actor, Integer> {
}