昨天在一个现有的工程（spring+springmvc）上配置mybatis，首先增加了依赖包，配置了spring-mybatis.xml文件和jdbc.propertires文件。再直接在spring配置文件中引入spring-mybatis.xml，测试事务回滚的时候发现不生效。
原配置：
spring-mybtatis.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.1.xsd">
<!-- 引入配置文件 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:config/mybatis/jdbc.properties" />
</bean>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close" scope="singleton">
<property name="driverClassName" value="${oracle.driver}" />
<property name="url" value="${oracle.url}" />
<property name="username" value="${oracle.username}" />
<property name="password" value="${oracle.password}" />
<property name="validationQuery" value="select 1 from dual" />
<!--maxActive: 最大连接数量 -->
<property name="maxActive" value="400" />
<!--removeAbandoned: 是否自动回收超时连接 -->
<property name="removeAbandoned" value="true" />
<!--removeAbandonedTimeout: 超时时间(以秒数为单位) -->
<property name="removeAbandonedTimeout" value="180" />
<!--maxWait: 超时等待时间以毫秒为单位 60000毫秒/1000等于60秒 -->
<property name="maxWait" value="60000" />
<property name="filters" value="stat" />
</bean>
<!-- 事务管理 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!--使用注释事务 -->
<tx:annotation-driven transaction-manager="transactionManager" />
<!-- sqlSession -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:config/mybatis/mapper/*.xml"></property>
</bean>
<!-- DAO接口所在位置 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.demo.mapper" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
</beans> jdbc.propertires
# dev
oracle.driver=oracle.jdbc.driver.OracleDriver
oracle.url=
oracle.username=
oracle.password=applicationContext.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd"
xmlns:util="http://www.springframework.org/schema/util" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
default-lazy-init="true">
<context:annotation-config />
<import resource="classpath:config/mybatis/spring-mybatis.xml"/>
</beans>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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"
default-lazy-init="true">
<mvc:annotation-driven />
<!-- spring-mvc 启用注解 -->
<context:component-scan base-package="cn.cslp.dgs.*">
</context:component-scan>
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:config/portal_app.properties</value>
</list>
</property>
</bean>
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter" />
<ref bean="stringHttpMessageConverter" />
<ref bean="byteArrayHttpMessageConverter"/>
</list>
</property>
</bean>
<bean id="stringHttpMessageConverter"
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json; charset=UTF-8</value>
</list>
</property>
</bean>
<bean id="byteArrayHttpMessageConverter" class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
<!--拦截器配置-->
<mvc:interceptors>
<bean class="cn.cslp.dgs.interceptor.AccessLogInterceptor"/>
</mvc:interceptors>
</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_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>Demo</display-name>
<!-- log4j配置，文件路径，因为是跟随项目启动 -->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.xml</param-value>
</context-param>
<!-- 配置log4j.xml变量，如果需要动态的就使用下面方式，使用方法${name} -->
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>60000</param-value>
</context-param>
<!-- 日志级别 -->
<context-param>
<param-name>loggingLevel</param-name>
<param-value>info</param-value>
</context-param>
<!-- 加载log4j配置文件 -->
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<!--spring -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- spring -mvc -->
<servlet>
<servlet-name>springMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/mvc/springmvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- <session-config> <session-timeout>2</session-timeout> </session-config> -->
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>事务位置：
@Service
public class UserServiceImple implements UserService{
@Autowired
private UserMapper userMapper;
@Override
public User get(String code) {
return userMapper.get(code);
}
@Override
@Transactional(propagation=Propagation.REQUIRED)
public Integer insert(User user) {
userMapper.insert(user);
int i = 1/0;
return 0;
}
}网上查找博客，有一种情况是service注解的识别由spring-mvc来完成则事务不生效，但是 spring的扫描生成的service是具有事务处理能力的service，springMVC扫描出来的service是不具有事务处理能力的service。spring的生成过程中如果同一个类声称两次的话，以后一次的为准，程序先生成spring的，后生成springMVC的，所以由springMVC生成的service为准，它不具有事务能力，所以每次事务都不成功。
然后
将applicationContext.xml 修改如下内容
<!-- spring 启用service注解 -->
<context:component-scan base-package="OThinker.H3.Controller.*,OThinker.H3.service.*,cn.cslp.dgs.*">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>将是spring-mvc.xml 修改如下内容
<!-- spring-mvc 不启用service注解 -->
<context:component-scan base-package="OThinker.H3.Controller.*,OThinker.H3.service.*,cn.cslp.dgs.*">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
</context:component-scan>虽然在项目中 springMvc后扫描,，但不扫描Service，则 Service 由spring 生成，具有事务能力。
参看博客：https://blog.csdn.net/qq_19435275/article/details/51108415
