实体管理器 + @Transactional

问题描述

@Service
@Repository
@Transactional
public class VideoService  {

    @PersistenceContext
    EntityManager entityManager;

    public void save(Video video) {

        Video video1 = new Video();

        entityManager.persist(video1);

    }



<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
    <persistence-unit name="video_pu" transaction-type="RESOURCE_LOCAL" >
        <provider>org.hibernate.ejb.HibernatePersistence</provider>

        <properties>
            <property name="hibernate.hbm2ddl.auto" value="create-drop" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        </properties>

    </persistence-unit>
</persistence>


<bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost/video" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
      <property name="persistenceUnitName" value="video_pu"/>
      <property name="dataSource" ref="dataSource" />
      <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
           <property name="showSql" value="true" />
           <property name="generateDdl" value="true" />
           <property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
        </bean>
     </property>

    </bean>



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

    <!-- enable the configuration of transactional behavior based on annotations -->
    <tx:annotation-driven transaction-manager="transactionManager"/>


    <!-- post-processors for all standard config annotations -->
    <context:annotation-config/>

服务方法 save(Video video) 中的事务从未启动，因此也从未提交.错误在哪里?当我使用 EntityManagerFactory 时它工作得很好，但我不想明确开始和提交事务.我想和@Transactional 注释一起使用.

The transaction in service method save(Video video) is never started so also never commited. Where is the error? When I use EntityManagerFactory it works perfectly, but I don't want to explicitly begin and commit transaction. I want to use it with @Transactional annotation.

推荐答案

@beerbajay 是正确的，@Transactional 需要在你的 bean 上创建一个动态代理来应用事务逻辑，如果你的 Service 有一个接口，因为在您的情况下，它不是指示 Spring 创建基于类的代理的替代方法，如下所示:

@beerbajay is correct, @Transactional will need a dynamic proxy to be created on your bean to apply the transactional logic, which can be created if your Service has an interface, since in your case it doesn't an alternate would be to instruct Spring to create class based proxy, the following way:

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class='true/>

这篇关于实体管理器 + @Transactional的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！