@Transactional和entityManager.persist(o);

时间:2012-04-03 01:37:50

标签: java hibernate jpa transactions

我将Hibernate与JPA一起使用。我有一个用@Transactional注释的类,在这个类中我坚持一些对象:

@Transactional
@Repository
public class ImageRepository {
    @Autowired
    private EntityManager em;

    public Image factory(String imageHash) {
        Image image = new Image();
        image.setHash(imageHash);
        em.persist(image);
        return image;
    }
}

我可以看到hibernate使用select nextval ('hibernate_sequence')为图像对象指定了Id。但就是这样。该对象永远不会放入数据库中,当我尝试运行em.flush();时,我得到了:

javax.persistence.TransactionRequiredException: no transaction is in progress

此外,我没有收到任何错误。

我的申请背景:

<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-3.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-3.1.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">

    <context:annotation-config/>
    <context:spring-configured/>
    <context:property-placeholder location="classpath:application.properties"/>

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

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="persistenceUnit"/>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.dialect">${database.dialect}</prop>
                <prop key="hibernate.hbm2ddl.auto">${database.structure}</prop>
                <prop key="hibernate.connection.url">${database.connection}</prop>
                <prop key="hibernate.connection.username">${database.username}</prop>
                <prop key="hibernate.connection.password">${database.password}</prop>
                <prop key="hibernate.connection.driver_class">${database.driver}</prop>
                <prop key="hibernate.connection.shutdown">true</prop>
                <prop key="hibernate.connection.writedelay">0</prop>
                <prop key="hibernate.show_sql">${database.show_sql}</prop>
            </props>
        </property>
    </bean>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>

和persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
             http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">

    <persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
    </persistence-unit>
</persistence>

当我尝试合并某些对象时会发生同样的情况。

谢谢!

编辑3:

(以前的编辑不相关)

我注意到,当我从DWR(DirectWebRemoting)Servlet中持久化或编辑对象时,我没有任何问题。当我尝试从我自己的Servlet中做同样的事情时,我提到了问题。但我的Servlet的所有bean都是由Spring通过组件扫描和@Component或@Repository之类的注释创建的 - 所以我没有看到任何意义,为什么我应该遇到这样的问题。

1 个答案:

答案 0 :(得分:2)

@Transactional是Spring的一部分。您的代码似乎未使用Spring context

要使用ImageRepository.factory()方法,需要通过Spring上下文包装才能使@Transactional注释生效。