Question

我在非Web应用程序中使用spring，我正在使用hibernate来处理DB。我遇到的问题是“registerShutdownHook（）;”关闭spring上下文容器它没有正确关闭并关闭JPA的资源，所以我与DB的连接被最大化了。

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="persistenceUnitName" value="pu" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="generateDdl" value="false" />
            <property name="showSql" value="false" />
            <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
        </bean>
    </property>
</bean>

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

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

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

<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

我使用上面提到的配置启动JPA层并使用“@Transactional”注释将EM注入DAO。

也许有人可以帮助我解决我错过的问题，或者我应该如何在独立环境中正确关闭JPA会话？

谢谢，

P.S。我得到的异常是：java.net.SocketException：没有可用的缓冲区空间（达到最大连接数？）：connect

Answer 1

1.创建事务管理器如下：

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >  
    <property name="persistenceUnitName" value="persistanceUnit"/>  
    <property name="dataSource" ref="dataSource"/>  
    <property name="persistenceXmlLocation" value="classpath:persistence.xml"/> 
    <property name="jpaVendorAdapter">  
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="showSql" value="${db.orm.showsql}" />              
            <property name="generateDdl" value="${db.orm.generateDdl}" />               
            <property name="database" value="${db.type}"/>  
            <property name="databasePlatform" value="${db.orm.dialect}" />
        </bean>
    </property>  
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">create</prop>
        </props>
    </property>
</bean>

2.use persistance.xml（应该在classpath中）

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
  <persistence-unit name="persistanceUnit" transaction-type="RESOURCE_LOCAL">
    <description>Oracle db Persistence Unit</description>   
    <class>com.company.YourModelClass</class>
    <properties/>
  </persistence-unit>
</persistence>

3.在applicationContext.xml

中添加以下注释

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

4.在服务类中解释您的Entitymanager，如：

 @PersistenceContext
 private EntityManager em = null;

5.将TrasnsactionManager注入：

private PlatformTransactionManager platformTransactionManager = null;

6.persist object like：

platformTransactionManager .persist(obj);

Answer 2

这是使用JPA的应用程序Context.xml的另一个示例。它对我来说很好。

       <context:property-placeholder location=”classpath:jdbc.properties”/>

      <!– Connection Pool –>

      <bean id=”dataSource” destroy-method=”close”>

        <property name=”driverClass” value=”${jdbc.driverClass}”/>

        <property name=”jdbcUrl” value=”${jdbc.url}”/>

        <property name=”user” value=”${jdbc.username}”/>

        <property name=”password” value=”${jdbc.password}”/>

    </bean>



      <!– JPA EntityManagerFactory –>

      <bean id=”entityManagerFactory”

                  p:dataSource-ref=”dataSource”>

            <property name=”jpaVendorAdapter”>

                  <bean>

                          <property name=”database” value=”${jdbc.database}”/>

                              <property name=”showSql” value=”${jdbc.showSql}”/>                       

            </bean>          

            </property>

      </bean>

      <!– Transaction manager for a single JPA EntityManagerFactory (alternative to JTA) –>
      <bean id=”transactionManager”

                  p:entityManagerFactory-ref=”entityManagerFactory”/>



      <!– Activates various annotations to be detected in bean classes for eg @Autowired–>

      <context:annotation-config/>



        <!– enable the configuration of transactional behavior based on annotations  –>

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



      <!– Property Configurator –>

    <bean id=”propertyConfigurer”>

            <property name=”location” value=”jdbc.properties”/>

      </bean>

    <context:component-scan base-package=”com.test.dao”/>

</beans>

Spring独立应用程序中的JPA / Hibernate

2 个答案: