Spring MVC+Mybatis整合为什么抛出Context initialization failed org.springframework.beans.factory.BeanCreationException异常？

本人在联系SpringMVC+Mybatis整合的时候出现了如下的错误

SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.mybatis.spring.mapper.MapperScannerConfigurer#0' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Cannot resolve reference to bean 'ssf' while setting bean property 'sqlSessionFactoryBeanName'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ssf' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\apache-tomcat-6.0.45\webapps\Spring_Mybatis\WEB-INF\classes\com\lxj\sql\LogMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Log'.  Cause: java.lang.ClassNotFoundException: Cannot find class: Log
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:326)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:107)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1417)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1158)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:438)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:624)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4236)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4739)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:803)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:780)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:583)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1080)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1003)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:507)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:325)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1069)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:822)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.core.StandardService.start(StandardService.java:525)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:759)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

applicationContext.xml主要的配置如下

<bean id="dbcp" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="username" value="martin"></property>
    <property name="password" value="oracle"></property>
    <property name="url" value="jdbc:oracle:thin:@192.168.15.42:1521:orcl"></property>
    <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
</bean>

<bean id="ssf" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 注入dataSource -->
    <property name="dataSource" ref="dbcp"></property>
    <!-- 注入sql语句文件 -->
    <property name="mapperLocations" value="classpath:com/lxj/sql/*.xml"></property>
</bean>

<!-- 可以根据指定路径批量生成dao实现 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.lxj.dao"></property>
    <!-- 这里会自动注入SqlSessionFactory -->
    <property name="sqlSessionFactory" ref="ssf"></property>
</bean>

哪位大神帮我解答解答吧，已经折磨我两天了。。