持久化对象时没有可用的事务性 EntityManager

Posted 2023-04-01

【中文标题】持久化对象时没有可用的事务性 EntityManager

【英文标题】：No transactional EntityManager available when Persisting an object

【发布时间】：2015-05-29 21:01:39

【问题描述】：

当我尝试持久化对象时，没有可用的事务性 EntityManager 异常。

我有一个带有以下配置类的 Spring 项目：

@Configuration
@ComponentScan
@EnableTransactionManagement
@EnableJpaRepositories
public class SpringConfiguration 
@Bean(name = "entityManagerFactory")
public LocalContainerEntityManagerFactoryBean emf(DataSource dataSource) 
    LocalContainerEntityManagerFactoryBean emf =new LocalContainerEntityManagerFactoryBean();
    emf.setDataSource(dataSource);
    Properties jpaProperties = new Properties();
    jpaProperties.put("hibernate.hbm2ddl.auto", "create-drop");
    jpaProperties.put("hibernate.show_sql", "true");
    emf.setJpaProperties(jpaProperties);
    emf.setPackagesToScan(
        new String[] "ds.core.entity");
    emf.setJpaVendorAdapter(
        new HibernateJpaVendorAdapter());
    return emf;

@Bean(name = "transactionManager")
public PlatformTransactionManager transactionManager(EntityManagerFactory emf,DataSource dataSource) 
    JpaTransactionManager tm = 
        new JpaTransactionManager();
        tm.setEntityManagerFactory(emf);
        tm.setDataSource(dataSource);
    return tm;

还有一个实体类：

@Entity
public class Type 
@Id @GeneratedValue
private Long id;
private String name;

和Jpa实现类：

@Repository
public class JpaTypeRepo implements TypeRepo 
@PersistenceContext
private EntityManager em;
@Override
public Type insertRecord(Type data) 
    em.persist(data);
    return data;

最后是带有Init() 的服务类：

@Transactional
@Service
public class InitDbService 
@Autowired
private TypeRepo typeRepo;
@PostConstruct
public void init()     
        Type type=new Type();
        type.setName("newName");
        typeRepo.insertRecord(type);
    

【参考方案1】：

只需在类中添加@Transactional 注释：JpaTypeRepo 如下：

@Transactional
@Repository
public class JpaTypeRepo implements TypeRepo 
  @PersistenceContext
  private EntityManager em;
  @Override
  public Type insertRecord(Type data) 
    em.persist(data);
    return data;