springMVC 事务无效,context:component-scan 配置
用springMVC做项目，做到一半发现事务不好用，这可是大问题，苦苦google，终于解决,贴出来与大家分享。
本小猿得出的结论都是实验得来，应该是正确的，如果想得到更直接，更准确的答案，请去研究官方文档。
事务不好用前的代码
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"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<display-name>/pad</display-name>
<!-- Spring ApplicationContext配置文件的路径�,可使用通配符，多个路径用�1,号分隔
此参数用于后面的Spring-Context loader -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:spring/*.xml</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.xml</param-value>
</context-param>
<context-param>
<param-name>chekPower</param-name>
<param-value>true</param-value>
</context-param>
<!-- Character Encoding filter -->
<filter>
<filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>pad</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>pad</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>30</session-timeout>
</session-config>
<!-- Error Page定义 -->
<error-page>
<error-code>500</error-code>
<location>/commons/error.jsp</location>
</error-page>
<error-page>
<error-code>404</error-code>
<location>/commons/404.jsp</location>
</error-page>
<error-page>
<error-code>403</error-code>
<location>/commons/403.jsp</location>
</error-page>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>pad-servlet.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-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
default-autowire="byName">
<context:annotation-config/>
<context:component-scan base-package="com.zkhg.pad">
</context:component-scan>
<mvc:annotation-driven />
<mvc:interceptors>
<bean class="com.zkhg.pad.common.project.PadInterceptor" />
</mvc:interceptors>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="10485760"/>
</bean>
</beans>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"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<bean id="placeholderConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="WEB-INF/datasource-config.properties" />
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${database.driver}" />
<property name="url" value="${database.url}" />
<property name="username" value="${database.username}" />
<property name="password" value="${database.password}" />
<!-- <property name="defaultAutoCommit" value="false" /> -->
<property name="maxActive" value="${database.maxActive}" />
<property name="initialSize" value="${database.initialSize}" />
<property name="maxWait" value="${database.maxWait}" />
<property name="maxIdle" value="${database.maxIdle}" />
<property name="minIdle" value="${database.minIdle}" />
<property name="removeAbandoned" value="${database.removeAbandoned}" />
<property name="removeAbandonedTimeout" value="${database.removeAbandonedTimeout}" />
</bean>
<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
<property name="configLocation">
<value>classpath:sqlMapConfig.xml</value>
</property>
<property name="mappingLocations">
<value>classpath*:com/zkhg/pad/sqlMap/*/*.xml</value>
</property>
<property name="dataSource">
<ref local="dataSource" />
</property>
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource">
<ref local="dataSource" />
</property>
</bean>
<tx:advice id="serviceAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="insert*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="add*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="del*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="remove*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="update*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="edit*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="is*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="adjust*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="execute*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="*" read-only="true" />
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut id="servicePointcut" expression="execution(* com.zkhg.pad.service..*.*(..))" />
<aop:advisor pointcut-ref="servicePointcut" advice-ref="serviceAdvice" />
</aop:config>
</beans>问题解决后的代码
web.xml没有改变
pad-servlet.xml(beans的头与上面代码一样):
[color=red] <context:component-scan base-package="com.zkhg.pad.controller" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<mvc:annotation-driven />
<mvc:interceptors>[/color]
<bean class="com.zkhg.pad.common.project.PadInterceptor" />
</mvc:interceptors>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="10485760"/>
</bean>applicationContext.xml(beans的头与上面代码一样):
[color=red] <context:component-scan base-package="com.zkhg.pad.dao" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Repository" />
</context:component-scan>
<context:component-scan base-package="com.zkhg.pad.service" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Service" />
</context:component-scan>
<bean id="placeholderConfig" [/color]class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="WEB-INF/datasource-config.properties" />
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${database.driver}" />
<property name="url" value="${database.url}" />
<property name="username" value="${database.username}" />
<property name="password" value="${database.password}" />
<!-- <property name="defaultAutoCommit" value="false" /> -->
<property name="maxActive" value="${database.maxActive}" />
<property name="initialSize" value="${database.initialSize}" />
<property name="maxWait" value="${database.maxWait}" />
<property name="maxIdle" value="${database.maxIdle}" />
<property name="minIdle" value="${database.minIdle}" />
<property name="removeAbandoned" value="${database.removeAbandoned}" />
<property name="removeAbandonedTimeout" value="${database.removeAbandonedTimeout}" />
</bean>
<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
<property name="configLocation">
<value>classpath:sqlMapConfig.xml</value>
</property>
<property name="mappingLocations">
<value>classpath*:com/zkhg/pad/sqlMap/*/*.xml</value>
</property>
<property name="dataSource">
<ref local="dataSource" />
</property>
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource">
<ref local="dataSource" />
</property>
</bean>
<tx:advice id="serviceAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="insert*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="add*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="del*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="remove*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="update*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="edit*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="is*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="adjust*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="execute*" propagation="REQUIRED" rollback-for="Throwable" />
<tx:method name="*" read-only="true" />
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut id="servicePointcut" expression="execution(* com.zkhg.pad.service..*.*(..))" />
<aop:advisor pointcut-ref="servicePointcut" advice-ref="serviceAdvice" />
</aop:config>注意红色的部分。
下面讲讲我解决的过程
首先在下面的文章找到了解决方法
（1）http://www.open-open.com/lib/view/1344438531093
但是我启动时发现，启动时间变长了，于是乎继续查询原因
我注意到可能是context:component-scan这个标签的问题
在http://jinnianshilongnian.iteye.com/blog/1762632中找到了相应的讲解
经过我认真的考虑和实验得出了结论
结论：默认扫描指定包下的全部@Component,exclude-filter指定的不扫描，include-filter指定的扫描，include-filter和exclude-filter没有指定的仍然扫描。
use-default-filters="true"时，include-filter无效。use-default-filters="false"时，exclude-filter无效。
原来是重复的扫描了包，导致启动变慢。
看到<context:annotation-config/>我就觉得别扭，想弄清它是干嘛的
于是查到http://mushiqianmeng.blog.51cto.com/3970029/723880
去掉了<context:annotation-config/>配置文件更清爽了，而且启动加快。
问题虽然解决，但是为什么事务会不好用，bug的原理是什么？
（1）中提到可能是servlet.xml和applicationContext.xml加载的顺序问题，没有深入的探讨。
我感觉是servlet和listener的启动，和servlet的依赖注入问题。
查到启动顺序listener>servlet
而context:component-scan就是扫描指定的包并创建实例，执行依赖注入。
而事务是配置在applicationContext.xml中即在listener作用域中
如果在pad-servlet中扫描了service包，这个包是在servlet中被创建的，servlet.xml是没有配置事务的。所以事务不起作用。
servlet在执行注入的时候，会拿到listener中的配置好事务的bean进行注入，这时事务才起作用。
到这里问题应该解决大部分，剩下的疑问只能留给以后，看源代码的时候了
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