转载SPRING解决事务

 

Spring MVC @Transactional注解方式事务失效的解决办法

分类： Java 2013-09-25 10:32  378人阅读  评论(0)  收藏  举报

前文提到，最新换了框架，新项目用SpringMVC + Spring JdbcTemplate。搭框架时，发现了一个事务无法正常回滚的问题，记录如下：

首先展示问题：

Spring applicationContext.xml配置：

 

<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName">
        <value>java:comp/env/jdbc/willvalue>
    property>
bean>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource" />
bean>

<bean id="txManager"
    class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource" />
bean>


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

 

Spring mvc.dispatcher.xml配置：

 

<context:component-scan base-package="com.will" >
context:component-scan>


<mvc:annotation-driven />


<mvc:default-servlet-handler/>



<bean id="viewResolver"
    class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass"  value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/pages/" />
    <property name="suffix" value=".jsp" />
bean>

然后在Service层模拟了一个事务回滚的method case：

 

 

@Transactional
public boolean save(Person person)
{
   for(int id: new int[]{2,3})
    {
        personDao.del(id);
        int j = 1/0;
    }

    return false;
}

本以为大功告成，在运行save方法时，由于1/0 抛出 java.lang.ArithmeticException: / by zero  RuntimeException，导致事务回归。However，no way! So crazy~

查了下，发现Spring MVC对于事务配置比较讲究，需要额外的配置。解决办法如下：

 

需要在 applicationContext.xml增加：

 

<context:component-scan base-package="com.will">
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
context:component-scan>

在 Spring mvc.dispatcher.xml增加：

 

 

<context:component-scan base-package="com.will" >
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
context:component-scan>

 

由于web.xml中配置：

 

<context-param>
    <param-name>contextConfigLocationparam-name>
    <param-value>
             classpath:applicationContext.xml
    param-value>
context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
listener>
<servlet>
    <servlet-name>dispatcherservlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
    <init-param>
         <param-name>contextConfigLocationparam-name>
         <param-value>classpath*:/mvc_dispatcher_servlet.xmlparam-value>
    init-param>
    <load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
    <servlet-name>dispatcherservlet-name>
    <url-pattern>*.dourl-pattern>
servlet-mapping>

 

 

Spring容器优先加载由ServletContextListener（对应applicationContext.xml）产生的父容器，而SpringMVC（对应mvc_dispatcher_servlet.xml）产生的是子容器。子容器Controller进行扫描装配时装配的@Service注解的实例是没有经过事务加强处理，即没有事务处理能力的Service，而父容器进行初始化的Service是保证事务的增强处理能力的。如果不在子容器中将Service exclude掉，此时得到的将是原样的无事务处理能力的Service。

 

经过以上分析，故可以优化上述配置：

 

在 applicationContext.xml增加：

 

<context:component-scan base-package="com.will">
context:component-scan>

在 Spring mvc.dispatcher.xml增加：

 

 

<context:component-scan base-package="com.will" >
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
context:component-scan>

 

经过如上配置，可以发现事务控制部分的日志如下：

 

2013-09-25 09:53:13,031 [http-8080-2] DEBUG [org.springframework.transaction.annotation.AnnotationTransactionAttributeSource] - Adding transactional method 'save' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''
2013-09-25 09:53:13,037 [http-8080-2] DEBUG [org.springframework.beans.factory.support.DefaultListableBeanFactory] - Returning cached instance of singleton bean 'txManager'
2013-09-25 09:53:13,050 [http-8080-2] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Creating new transaction with name [com.will.service.impl.PersonServiceImpl.save]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''
2013-09-25 09:53:13,313 [http-8080-2] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Acquired Connection [jdbc:mysql://localhost:3306/mvc?useUnicode=true&characterEncoding=UTF-8, UserName=root@localhost, MySQL-AB JDBC Driver] for JDBC transaction
2013-09-25 09:53:13,323 [http-8080-2] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Switching JDBC Connection [jdbc:mysql://localhost:3306/mvc?useUnicode=true&characterEncoding=UTF-8, UserName=root@localhost, MySQL-AB JDBC Driver] to manual commit
2013-09-25 09:53:13,327 [http-8080-2] DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL update
2013-09-25 09:53:13,328 [http-8080-2] DEBUG [org.springframework.jdbc.core.JdbcTemplate] - Executing prepared SQL statement [delete from person where id=?]
2013-09-25 09:53:13,348 [http-8080-2] DEBUG [org.springframework.jdbc.core.JdbcTemplate] - SQL update affected 1 rows
2013-09-25 09:53:13,363 [http-8080-2] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Initiating transaction rollback
2013-09-25 09:53:13,364 [http-8080-2] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Rolling back JDBC transaction on Connection [jdbc:mysql://localhost:3306/mvc?useUnicode=true&characterEncoding=UTF-8, UserName=root@localhost, MySQL-AB JDBC Driver]
2013-09-25 09:53:13,377 [http-8080-2] DEBUG [org.springframework.jdbc.datasource.DataSourceTransactionManager] - Releasing JDBC Connection [jdbc:mysql://localhost:3306/mvc?useUnicode=true&characterEncoding=UTF-8, UserName=root@localhost, MySQL-AB JDBC Driver] after transaction
2013-09-25 09:53:13,378 [http-8080-2] DEBUG [org.springframework.jdbc.datasource.DataSourceUtils] - Returning JDBC Connection to DataSource

在2013-09-25 09:53:13,363处进行了rollback。