关于基于XML技术开发AOP应用报错的问题
小弟初学spring(其实也是JAVA的初学者)。
关于基于XML技术开发AOP应用报错的问题。

applicationContext.xml涉及的代码如下：
<bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"></bean>
<bean id="aspetbean" class="cn.itcast.service.MyInterceptor"></bean>
<aop:config>
<aop:aspect id="asp" ref="aspetbean">
<aop:pointcut id="mycut" expression="execution(* cn.itcast.service.impl.PersonServiceBean.*(..))"/>
<aop:before pointcut-ref="mycut" method="doAccessCheck"/>
</aop:aspect>
</aop:config>

拦截类：
public class MyInterceptor {

//private void anyMethod(){} //声明切入点

public void doAccessCheck(String start)
{
System.out.println("前置通知: "+start);
}
}

拦截目标类：
public interface PersonService {
。。。
}
public class PersonServiceBean implements PersonService {
。。。。
}
报错如下，请指教，谢谢!

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personService' defined in class path resource [ApplicationContext.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.aop.aspectj.AspectJPointcutAdvisor]: Constructor threw exception; nested exception is java.lang.IllegalArgumentException: error at ::0 formal unbound in pointcut 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:405)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:220)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:729)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:381)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at junit.text.SpringAOPTest.interceptorTest(SpringAOPTest.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Met