Spring boot在配置类中注入EntityManagerFactory

我正在使用 Spring Boot，我想将 Spring 与 Hibernate 集成。我想制作一个会话工厂 bean 供进一步使用。但我无法自动装配 EntityManagerFactory，我无法仅在配置类中自动装配它，在其他类中它可以工作。你能帮忙吗？

配置类

package kz.training.springrest.configuration;

@Configuration
@EnableTransactionManagement
public class DatabaseConfiguration {

    @Autowired
    private EntityManagerFactory entityManagerFactory;

    @Bean
    public SessionFactory getSessionFactory() {
        if (entityManagerFactory.unwrap(SessionFactory.class) == null) {
            throw new NullPointerException("factory is not a hibernate factory");
        }
        return entityManagerFactory.unwrap(SessionFactory.class);
    }
}

依赖关系

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.2.2</version>
        </dependency
    </dependencies>

当你说

但我无法自动装配 EntityManagerFactory

它是否无法编译或在运行时抛出异常？如果是后者，堆栈跟踪会说什么？

一种可能的解决方案/解决方法可能是使用 em 注入配置而不是 em 工厂@PersistenceContext注解：

@Configuration
@EnableTransactionManagement
public class DatabaseConfiguration {

    @PersistenceContext
    private EntityManager entityManager;

    @Bean
    public SessionFactory getSessionFactory() {
        // no need to check for null here because if the unwrap fails, it will do
        // so by throwing a PersistenceException rather than returning null.
        return entityManager.unwrap( Session.class ).getFactory();
    }
}