Question

我知道有很多关于交易的问题，但没有一个答案对我有帮助。所以，我正在尝试在我的Spring MVC应用程序中启用事务，但我不知道为什么它不起作用。这是我的配置xml

<context:component-scan base-package="ru.tsystems"/>

<bean id="ecareEMF" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="packagesToScan" value="ru.tsystems.persistence.entity"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">create-drop</prop>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
        </props>
    </property>
</bean>


<bean id="dataSource"
      class="org.apache.commons.dbcp2.BasicDataSource">
    <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
    <!--Some problems with server's time/date-->
    <property name="url"
              value="jdbc:mysql://localhost:3306/ecare?useSSL=false&amp;useUnicode=true&amp;useJDBCCompliantTimezoneShift=true&amp;useLegacyDatetimeCode=false&amp;serverTimezone=UTC"/>
    <property name="username" value="root"/>
    <property name="password" value="root"/>
</bean>

<bean id="transactionManager"
      class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="ecareEMF"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>

我尝试在我的服务类上使用@Transactional注释，在它的方法上，在DAO的方法上，但每次我得到相同的异常：

2018-04-06 01:27:04 DEBUG UserDAOImpl:34 - javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliably process 'persist' call

我认为我只是搞砸了配置，但以防其他类涉及处理。这是控制器的方法：

@RequestMapping(value = "/greeting", method = RequestMethod.POST)
public @ResponseBody
String greeting(@Valid UserDTO userDTO, BindingResult result) {
    logger.debug("Attempting to save " + userDTO.toString() + " in db.");
    userMngService.save(userDTO.convertToUser());

    return userDTO.toString();
}

服务：

@Service
@Transactional
public class UserMngService {
    @Autowired
    private UserDAO userDAO;

    public void save(User user) {
        userDAO.persist(user);
    }
}

DAO：

@Repository
public class UserDAOImpl extends GenericDAOImpl<User, Long> implements UserDAO {

}

Generic DAO：

    public abstract class GenericDAOImpl<E, K> implements GenericDAO<E, K> {
    protected Class<E> entityClass;

    @PersistenceContext
    private EntityManager entityManager;

    private static final Logger logger = Logger.getLogger(UserDAOImpl.class);


    @SuppressWarnings("unchecked")
    public GenericDAOImpl(){
        entityClass = (Class<E>) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
    }

    @Override
    public void persist(E entity) {
        try{
            entityManager.persist(entity);
        }catch (PersistenceException e){
            logger.debug(e.toString());
        }
    }

    @Override
    public void delete(E entity) {
        try{
            entityManager.remove(entity);
        }catch (PersistenceException e){

        }
    }

    @Override
    public void update(E entity) {
        try{
            entityManager.merge(entity);
        }catch (PersistenceException e){

        }
    }

    @Override
    public E get(K id) {
        try{
            return entityManager.find(entityClass, id);
        }catch (PersistenceException e){
            return null;
        }
    }

    @Override
    public List<E> getAll() {
        throw new UnsupportedOperationException();
    }
}

Answer 1

我有两个配置文件：app-config.xml和web-config.xml。后者用于MVC配置。他们都有<context:component-scan base-package="ru.tsystems"/>标签，看起来就是问题所在。这是论坛上的topic，帮助我解决了这个问题。

编辑：错字

启用Spring Transactions，javax.persistence.TransactionRequiredException

1 个答案:

启用S​​pring Transactions，javax.persistence.TransactionRequiredException

1 个答案:

启用Spring Transactions，javax.persistence.TransactionRequiredException