Question

我已经坚持了很长一段时间了。我想将遗留应用程序中的Hibernate配置升级到JPA配置，仍然使用Hibernate作为底层实现。版本包括：Hibernate 4.3.11和Spring 4.2.4。

配置采用XML格式，为清晰起见，拆分为较小的配置文件：

datasource.xml

<bean id="hibernateDataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="jdbc/my-db"/>
    <property name="resourceRef" value="true"/>
</bean>

实体manager.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="hibernateDataSource"/>
        <property name="packagesToScan" ref="hibernatePackagesToScan"/>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="connection.isolation">2</prop>
                <prop key="export">false</prop>
                <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
                <prop key="hibernate.cache.use_minimal_puts">true</prop>
                <prop key="hibernate.cache.use_second_level_cache">true</prop>
                <prop key="hibernate.cache.use_query_cache">true</prop>
                <prop key="hibernate.current_session_context_class">thread</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect</prop>
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.DefaultComponentSafeNamingStrategy</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.generate_statistics">false</prop>
                <prop key="hibernate.hbm2ddl.auto"/>
                <prop key="hibernate.mapping.precedence">class, hbm</prop>
                <prop key="hibernate.max_fetch_depth">0</prop>
                <prop key="hibernate.multi_tenant_connection_provider">com.myapp.MyMultiTenantConnectionProvider</prop>
                <prop key="hibernate.multiTenancy">SCHEMA</prop>
                <prop key="hibernate.show_sql">false</prop>
                <prop key="hibernate.temp.use_jdbc_metadata_defaults">false</prop>
                <prop key="hibernate.tenant_identifier_resolver">com.myapp.MyTenantProvider</prop>
                <prop key="hibernate.use_sql_comments">false</prop>
                <prop key="net.sf.ehcache.configurationResourceName">/ehcache.xml</prop>
            </props>
        </property>
    </bean>

    <!-- For use in beans that depend on session factory -->
    <bean id="sessionFactory" class="org.springframework.orm.jpa.vendor.HibernateJpaSessionFactoryBean"/>

    <bean id="hibernatePackagesToScan" class="java.util.ArrayList">
        <constructor-arg>
            <list>
                <value>com.myapp.model</value>
            </list>
        </constructor-arg>
    </bean>
</beans>

交易manager.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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.xsd">

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

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

DAO扩展了一个如下所示的AbstractDao：

public abstract class AbstractDao
{
    @Autowired
    private SessionFactory sessionFactory;

    protected Session getSession()
    {
        try
        {
            return sessionFactory.getCurrentSession();
        }
        catch (org.hibernate.HibernateException e)
        {
            return sessionFactory.openSession();
        }
    }
}

对webapp的所有请求都通过OpenEntityManagerInViewFilter。

在第一个请求中，调用DAO使用简单的Criteria从数据库中获取一些配置：

@Override
public ApplicationSettings getSettings()
{
    Criteria criteria = getSession().createCriteria(ApplicationSettings.class);
    return (ApplicationSettings) criteria.uniqueResult();
}

此调用导致带有消息的HibernateException：如果没有活动事务，createCriteria无效。

我在这里可以错过什么？

将遗留应用程序迁移到JPA后，事务处于非活动状态

0 个答案: