Spring Boot在配置类中注入EntityManagerFactory [英] Spring boot inject EntityManagerFactory in configuration class

问题描述

我正在使用Spring Boot，并且我想将Spring与Hibernate集成在一起.我想制作一个Session Factory bean以便进一步使用.但是我不能自动装配EntityManagerFactory，我不能仅在配置类中自动装配它，在其他类中也可以工作.你能帮忙吗?

I'm using spring boot and i want to integrate spring with hibernate. I want to make a Session Factory bean for further using. But I can't autowire EntityManagerFactory, I can't autowire it only in the configuration class, in other classes it works. Can you help, please?

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);
    }
}

依赖项

    <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>

推荐答案

我不确定为什么要同时公开两个bean，因为@chrylis指出，您可以在需要的地方轻松将EMF解包为SF.

I'm not exactly sure why you want to expose both beans because as @chrylis points out, you can easily unwrap the EMF into a SF where needed.

// Some spring component
@Component
public class MyFancyComponent {
  @PersistenceContext
  private EntityManager entityManager;

  public void doSomethingFancy() {
    // public SessionFactory API
    final SessionFactory sf = entityManager
         .unwrap( Session.class ).getFactory();

    // public SessionFactoryImplementor SPI
    final SessionFactoryImplementor sfi = entityManager
         .unwrap( SessionImplementor.class ).getFactory();
  }
}

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