尝试让JPA / Hibernate使用REST - TransactionRequiredException:没有正在进行的事务错误

时间:2014-06-24 22:17:52

标签: java mysql spring hibernate jpa

我一直试图让Hibernate / JPA使用我简单的Spring 3.2 REST应用程序。

Hibernate / JPA在MySQL中成功创建了我的表,但是一旦进入存储库,事务就失败了 - 说没有事务正在进行中。我真的不在我的元素中,甚至不确定如何对此进行故障排除,因为看起来大多数代码都是在xml的幕后发生的。

任何帮助非常感谢。 更新 - jpaContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">

<context:annotation-config />
<context:component-scan base-package="com.saltcitywifi"></context:component-scan>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitName" value="punit" />
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" >
            <property name="showSql" value="true" />
        </bean>
    </property>
    <property name="jpaPropertyMap">
        <map>
            <entry key="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
            <entry key="hibernate.hbm2ddl.auto" value="create" />
            <entry key="hibernate.format_sql" value="true" />
        </map>
    </property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory" />

</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/salt_city_wifi?autoReconnect=true" />
    <property name="username" value="wifi_admin" />
    <property name="password" value="password" />
</bean>

控制器:

@Controller
public class HotSpotController {
@Autowired
private HotSpotService hotSpotService;

@RequestMapping(value = "/hotSpots", method = RequestMethod.GET)
public @ResponseBody
List<HotSpot> getHotSpots() {
    hotSpotService = new HotSpotServiceImpl();
    List<HotSpot> spots = hotSpotService.getAllHotSpots();
    return spots;
}

@RequestMapping(value = "/hotSpot", method = RequestMethod.POST)
public @ResponseBody
HotSpot addHotSpot(@RequestBody HotSpot hotSpot) {
    hotSpotService.addHotSpot(hotSpot);
    return hotSpot;
}

}

服务:

@Service("hotSpotService")
@Transactional
public class HotSpotServiceImpl implements HotSpotService {
@Autowired
private HotSpotRepository hotSpotRepository;
private AtomicLong counter = new AtomicLong();

public List<HotSpot> getAllHotSpots() {
    List<HotSpot> spots = new ArrayList<HotSpot>();
    HotSpot spot;
    for (int i = 0; i < 10; i++) {
        spot = new HotSpot("location " + i, "http://www.url" + i + ".com",
                counter.incrementAndGet());
        spots.add(spot);
    }
    return spots;
}

public HotSpot getHotSpotById(long id) {
    HotSpot spot = new HotSpot("New Spot", "New Url", id);
    return spot;
}

@Transactional
public HotSpot addHotSpot(HotSpot hotSpot) {
    return hotSpotRepository.addHotSpot(hotSpot);

}

}

@Repository("hotSpotRepository")
public class HotSpotRepositoryImpl implements HotSpotRepository {
@PersistenceContext
private EntityManager em;


public HotSpot addHotSpot(HotSpot hotSpot) {
    em.persist(hotSpot);
    em.flush();
    return hotSpot;
}

}

1 个答案:

答案 0 :(得分:0)

好的,我终于弄清楚这里发生了什么:

我有两个组件扫描程序,一个用于servlet-config.xml中的控制器,另一个用于jpaContext.xml中的JPA内容。

他们都在扫描我的整个应用程序:

<context:component-scan base-package="com.saltcitywifi" />

当我强制控制器的组件扫描器只查看控制器包时:

<context:component-scan base-package="com.saltcitywifi.controller" />

突然间我的请求工作并在数据库中处理。

我只能假设,因为我的servlet-config.xml配置只包含:

<context:component-scan base-package="com.saltcitywifi.controller" />
<mvc:annotation-driven />

Spring以某种方式让servlet-config.xml注册了JPA bean,因此没有获取事务注释。这仍然让我感到困惑,所以如果有人能帮助解释为什么会发生这种情况会非常有帮助。我可能只是问这个问题的另一个堆栈溢出问题。