相关疑难解决方法(0)

我是Spring和JPA的新手,浪费了5天,搜索互联网没有结果.我想将对象保存到SQL SERVER,连接是正确的但是当我写.flush()时我得到了异常

嵌套异常是javax.persistence.TransactionRequiredException:没有事务正在进行中

这是我的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/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:component-scan base-package="com.misha.service"/>
<context:component-scan base-package="com.misha.repository"/>
<context:component-scan base-package="com.misha.model"/>

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

<bean id="myEntityManager"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="com.misha.model"/>
    <property name="persistenceUnitName" value="test" /> 
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.hbm2ddl.auto">create</prop>
            <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
        </props>
    </property>
</bean>
<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver" />
    <property name="url"
        value="jdbc:jtds:sqlserver://127.0.0.1;instance=SQLEXPRESS;DatabaseName=misha" />
    <property name="username" value="sa" />
    <property name="password" value="root" /> …

我想使用JpaItemWriter批量持久化实体.但是当我使用下面的代码来坚持时,我被告知:

Hibernate: 
    select
        nextval ('hibernate_sequence')
[] 2014-03-19 15:46:02,237 ERROR : TransactionRequiredException: no transaction is in progress

如何启用以下事务:

@Bean
public ItemWriter<T> writer() {
    JpaItemWriter<T> itemWriter = new JpaItemWriter<>();
    itemWriter.setEntityManagerFactory(emf);
}

@Configuration
@EnableTransactionManagement
@EnableBatchProcessing 
class Config{ {
     @Bean
    public LocalContainerEntityManagerFactoryBean emf() {
        LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
        emf.setDataSource(dataSource());
        emf.setPackagesToScan("my.package");
        emf.setJpaVendorAdapter(jpaAdapter());
        emf.setJpaProperties(jpaProterties());
        return emf;
}

编辑:

@Bean
public Job airlineJob(JobBuilderFactory jobs, Step step) {
    return jobs.get("job")
            .start(step)
            .build();
}

//Reader is a `FlatFileItemReader`, writer is `CustomItemWriter`.
@Bean
public Step step(StepBuilderFactory steps,
        MultiResourceItemReader<T> rea, …