spring+hibernate的问题

我用spring+hibernate做数据库插入的练习，可抛异常，请各位帮我看看
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xml
<beans>
  <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName">
<value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
</property>
<property name="url">
<value>jdbc:microsoft:sqlserver://127.0.0.1:1433;dataBaseName=northwind</value>
</property>
<property name="username">
<value>sa</value>
</property>
<property name="password">
<value>sa</value>
</property>
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource">
      <ref local="dataSource"/>
    </property>
    <property name="mappingResources">
      <list>
        <value>com/aaa/Loginmds.hbm.xml</value>
      </list>
    </property>
    <property name="hibernateProperties">
      <props>
        <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
        <prop key="hibernate.show_sql">true</prop>
      </props>
    </property>
  </bean> <bean id="urlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/login.do">LoginAction</prop>
</props>
</property>
</bean> <bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass">
<value>
org.springframework.web.servlet.view.InternalResourceView
</value>
</property>
<property name="prefix">
<value>/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean> <bean id="LoginAction" class="com.aaa.loginAction">
<property name="ok">
<value>ok</value>
</property>
<property name="no">
<value>er</value>
</property>
<property name="l">
<ref bean="mdss"/>
</property>
</bean> <bean id="mdss" class="com.aaa.Loginmds">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
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抛异常
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/login-servlet.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/transaction/TransactionManager
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:403)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:233)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:145)
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:277)
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:313)
org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:139)
org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:306)
org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:251)
org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:220)
org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:112)
javax.servlet.GenericServlet.init(GenericServlet.java:211)