Spring Data JPA LocalEntityManagerFactoryBean getNativeEntityManagerFactory 返回 null

Question

我正在尝试按照this post 上的 sds 指示将拦截器附加到我的 Hibernate JPA EntityManagerFactory，但使用 java config。

这是我的配置的相关部分：

@Bean
public JpaTransactionManager transactionManager() {
    JpaTransactionManager txm = new JpaTransactionManager();
    txm.setEntityManagerFactory(entityManagerFactory().getObject());
    return txm;
}

@SuppressWarnings("unchecked")
@Bean
public SynchronizedEntityChangeInterceptor synchronizedEntityChangeInterceptor() {
    SynchronizedEntityChangeInterceptor synchronizedEntityChangeInterceptor = new SynchronizedEntityChangeInterceptor();
    synchronizedEntityChangeInterceptor.registerEntityClasses(Device.class, Artist.class);
    return synchronizedEntityChangeInterceptor;
}

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
    entityManagerFactory.setDataSource(dataSource());
    entityManagerFactory.setPersistenceUnitName("metamp-client");
    entityManagerFactory.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
    Properties jpaProperties = new Properties();
    jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.HSQLDialect");
    jpaProperties.put("hibernate.show_sql", "true");
    jpaProperties.put("hibernate.format_sql", "true");
    jpaProperties.put("hibernate.hbm2ddl.auto", "update");
    jpaProperties.put("hibernate.cache.use_second_level_cache", "false");
    entityManagerFactory.setJpaProperties(jpaProperties);
    return entityManagerFactory;
}

@Bean
public HibernateInterceptor hibernateInterceptor() {
    HibernateInterceptor hibernateInterceptor = new HibernateInterceptor();
    if(entityManagerFactory().getNativeEntityManagerFactory() == null)
            throw new NullPointerException("This shouldn't happen");
    hibernateInterceptor.setSessionFactory(
            ((HibernateEntityManagerFactory)entityManagerFactory()
                    .getNativeEntityManagerFactory()).unwrap(SessionFactory.class));
    hibernateInterceptor.setEntityInterceptor(synchronizedEntityChangeInterceptor());
    return hibernateInterceptor;
}

我的问题是“这不应该发生”总是会发生，所以 getNativeEntityManagerFactory() 返回 null 尽管 spring 文档说 otherwise。

这是一个错误，还是我做错了什么？

Answer 1

您不应该直接致电entityManagerFactory()。请尝试以下操作：

@Bean
public HibernateInterceptor hibernateInterceptor(
            LocalContainerEntityManagerFactoryBean factory) {
    HibernateInterceptor hibernateInterceptor = new HibernateInterceptor();
    if(factory.getNativeEntityManagerFactory() == null)
            throw new NullPointerException("This shouldn't happen");
    // rest of your code and use factory variable rather than entityManagerFactory()