spring+mybatis出现NoSuchBeanDefinitionException异常，是什么原因？

已进行mapper层，dataSource的测试也显示同一个异常：
Test类：

public class Test {
ApplicationContext ac;
@Before
public void Before(){
ac=new ClassPathXmlApplicationContext(new String[]{"classpath*:spring-mybatis.xml"});
}
@org.junit.Test
public void Test1(){

Object s=ac.getBean("propertyConfigurer");

    System.out.println(s);
}
}
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'propertyConfigurer' is defined
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:687)
at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1168)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:281)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:956)
at com.dao.Test.Test1(Test.java:26)