关于spring中配置hibernate申明事务无效的问题

在spring配置hibernate的申明事务的时候,发现事务控制一直都不好使，关键配置如下：
spring的MVC的配置如下：

    <context:component-scan base-package="com.going"/> 
	<context:annotation-config />

	<!-- To enable @RequestMapping process on type level and method level -->
	<bean
		class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
	<bean
		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
		<property name="messageConverters">
			<list>
				<ref bean="marshallingConverter" />
				<ref bean="jsonConverter" />
				<ref bean="atomConverter" />
			</list>
		</property>
	</bean>

	<!-- XML Converter -->
	<bean id="marshallingConverter"
		class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
		<constructor-arg ref="jaxbMarshaller" />
		<property name="supportedMediaTypes" value="application/xml" />
	</bean>

	<bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
		<property name="classesToBeBound">
			<list>
				<value>com.going.sample.domain.Employee</value>
				<value>com.going.sample.domain.EmployeeList</value>
			</list>
		</property>
	</bean>

	<!-- JSON Converter -->
	<bean id="jsonConverter"
		class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
		<property name="supportedMediaTypes" value="application/json" />
	</bean>

	<!-- ATOM Converter -->
	<bean id="atomConverter"
		class="org.springframework.http.converter.feed.AtomFeedHttpMessageConverter">
		<property name="supportedMediaTypes" value="application/atom+xml" />
	</bean>

	<!-- Client -->
	<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
		<property name="messageConverters">
			<list>
				<ref bean="marshallingConverter" />
				<ref bean="jsonConverter" />
				<ref bean="atomConverter" />
			</list>
		</property>
	</bean>
	<!-- viewer -->
	<!-- xmlView -->
	<bean id="xmlView"
		class="org.springframework.web.servlet.view.xml.MarshallingView">
		<constructor-arg ref="jaxbMarshaller" />
	</bean>
	<!-- jsonView -->
	<bean id="jsonView"
		class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />

	<bean
		class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
		<property name="mediaTypes">
			<map>
				<entry key="json" value="application/json" />
				<entry key="xml" value="application/xml" />
				<entry key="html" value="text/html" />
			</map>
		</property>
		<property name="viewResolvers">
			<list>
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
				<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/view/jsp/" />
					<property name="suffix" value=".jsp" />
				</bean>
			</list>
		</property>
	</bean>

applicationContext.xml的配置如下：

<!-- 数据源的配置 -->
	<bean id="dataSource"
		class="org.apache.commons.dbcp.BasicDataSource" 
		destroy-method="close"
		p:driverClassName="${jdbc.driverClassName}"
		p:url="${jdbc.databaseurl}" 
		p:username="${jdbc.username}"
		p:password="${jdbc.password}" />

<!-- hibernate工厂类的配置 -->	
<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="configLocation">
			<value>classpath:hibernate.cfg.xml</value>
		</property>
		<property name="configurationClass">
			<value>org.hibernate.cfg.AnnotationConfiguration</value>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">${jdbc.dialect}</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.jdbc.fetch_size">25</prop>
                <prop key="hibernate.jdbc.batch_size">50</prop>
                <!-- dev -->
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.generate_statistic">false</prop>
                <!-- cache -->
                <!--代表是否使用查询缓存，这里不使用，因为一般而言查询缓存的命中率并不是很高，所以我们没有 必要为每一个用户的查询缓存它的数据，所以这里设为false-->
                <prop key="hibernate.cache.use_query_cache">false</prop>
                <!--代表使用Hibernate的二级缓存-->
                <prop key="hibernate.cache.use_second_level_cache">false</prop>
                <!-- create db table -->
                <prop key="hibernate.hbm2ddl.auto">update</prop>				
			</props>
		</property>
	</bean>

	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

在以上配置的情况下，无论我的service怎么配置@Transactional注解，都无效，如：

@Service
@Transactional
public class ContactServiceImpl implements ContactService {
	
	@Autowired
	private ContactRepository contactRepository;
	
	

	public ContactRepository getContactRepository() {
		return contactRepository;
	}

	public void setContactRepository(ContactRepository contactRepository) {
		this.contactRepository = contactRepository;
	}

	@Transactional(propagation=Propagation.REQUIRED)
	public void addContact(Contact contact) {
		contactRepository.addContact(contact);
	}

	public List<Contact> listContact() {
		return contactRepository.listContact();
	}

	@Transactional(readOnly = true)
	public void removeContact(String id) {
		contactRepository.removeContact(id);
	}
}

即使我在removeContact方法中添加只读控制readOnly = true,相关删除实体操作一样能够正常执行。
后面在网上搜了一些信息，问题在于spring在实例化@Controller类时，Spring会自动把关联的@Service（此@Service已做了@Transaction事务注解）类实例化，此时事务并未生效，导致@Transaction注解无效，事务未被注册。解决办法如下：
将spring的mvc配置中的以下信息：

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

修改为：

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

表示容器在使用注解加载控制层时,不实例化控制层以外的组件。
除此以外，也将applicationContext.xml文件中添加如下的配置：

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

意思就是说使用注解加载除控制层以外的组件，这时，在加载service层时事务就会关联在服务层上，相关的事务注解的配置也就生效了。