Spring4整合Hibernate4出现的错误的解决
今天在使用Spring4整合Hibernate4过程中出现错误
org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
错误的原因是由于hibernate4修改了hibernate3中getCurrentSession()方法的支持,需要在service层注解@Transactional
具体的代码如下:
Spring-hibernate.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:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"><!-- Hibernate4 --><!-- 加载资源文件 其中包含变量信息,必须在Spring配置文件的最前面加载,即第一个加载--><context:property-placeholder location="classpath:db.properties" /><bean id="sessionFactory"class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"><property name="dataSource" ref="dataSource" /><property name="packagesToScan"><list><!-- 可以加多个包 --><value>com.xrea.entity</value></list></property><property name="hibernateProperties"><props><prop key="hibernate.dialect">${hibernate.dialect}</prop><prop key="hibernate.show_sql">${hibernate.show_sql}</prop><prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop></props></property></bean><!-- 数据库映射 --><bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"><property name="driverClassName" value="${jdbc.driverClassName}" /><property name="url" value="${jdbc.url}" /><property name="username" value="${jdbc.user}" /><property name="password" value="${jdbc.pass}" /></bean><!-- 配置Hibernate事务管理器 --><bean id="transactionManager"class="org.springframework.orm.hibernate4.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactory" /></bean><!-- 配置事务异常封装 --><bean id="persistenceExceptionTranslationPostProcessor"class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" /><!-- 声明式容器事务管理 ,transaction-manager指定事务管理器为transactionManager --><tx:advice id="txAdvice" transaction-manager="transactionManager"><tx:attributes><tx:method name="add*" propagation="REQUIRED" /><tx:method name="save*" propagation="REQUIRED" /><tx:method name="get*" propagation="REQUIRED" /><tx:method name="*" read-only="true" /></tx:attributes></tx:advice><aop:config expose-proxy="true"><!-- 只对业务逻辑层实施事务 --><aop:pointcut id="txPointcut" expression="execution(* com.xrea.service..*.*(..))" /><!-- Advisor定义,切入点和通知分别为txPointcut、txAdvice --><aop:advisor pointcut-ref="txPointcut" advice-ref="txAdvice"/></aop:config></beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"><display-name>easyui</display-name><!-- 加载Spring相关配置文件 --><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring/spring-*.xml</param-value></context-param><!-- 启动Spring的监听 --><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- 定义DispatcherServlet --><servlet><servlet-name>mvc-dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><!-- 默认/WEB-INF/[servlet名字]-servlet.xml加载上下文,如果配置了contextConfigLocation参数,将使用classpath:/mvc-dispatcher-servlet.xml加载上下文--><param-name>contextConfigLocation</param-name><param-value>classpath:spring/spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><!-- 拦截匹配的请求,这里所有请求采用名字为mvc-dispatcher的DispatcherServlet处理 --><servlet-mapping><servlet-name>mvc-dispatcher</servlet-name><url-pattern>*.html</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list></web-app>
spring-mvc.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:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"><context:annotation-config></context:annotation-config><context:component-scan base-package="com.xrea"></context:component-scan><!-- 基于注释的业务,当注释中发现@Transactional时,使用id为transactionManager的事务管理器 --><!-- 如果没有设置transaction-manager的值,则spring以缺省默认的事务管理器来处理事务,默认事务管理器为第一个加载的事务管理器 --><tx:annotation-driven transaction-manager="transactionManager"/><!-- 定义视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix"><value>/WEB-INF/jsp/</value></property><property name="suffix"><value>.jsp</value></property></bean></beans>
然后在Service层添加@Transactional注解即可
高质量的代码就是对程序自己最好的注释。当你打算要添加注释时,问问自己,“我如何能改进编码以至于根本不需要添加注释?”改进你的代码,然后才是用注释使它更清楚。

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