error at ::0 can't find referenced pointcut allMethod

今天在编写AOP代码如下：
package com.zy.spring;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.annotation.Before;

/***
* 定义切面aspect
*
* @author Douglas Lau
*
*/

@Aspect
public class SecurityHandler {

/***
* 定义Pointcut，Pointcut的名称是allMethod，此方法不能有返回值和参数，该方法只是一个标识
*
* Pointcut的内容是一个表达式，描述那些对象的那些方法(订阅Joinpoint)
*/
@Pointcut("execution(* addUser(..))")
private void allMethod() {
}

/***
* 定义Advice，标识在那些切个切入点何处技入此方法
*/
@Before("allMethod()")
//@Before("execution(* addUser(..))")
private void checkSecurity() {
System.out.println("---------安全性检查------------");
}

}
加载运行时总是提示如下错误

[color=red]Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userManager' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut allMethod
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.zy.spring.client.main(client.java:9)
Caused by: java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut allMethod
at org.aspectj.weaver.tools.PointcutParser.parsePointcutExpression(PointcutParser.java:317)
at org.springframework.aop.aspectj.AspectJExpressionPointcut.buildPointcutExpression(AspectJExpressionPointcut.java:195)
at org.springframework.aop.aspectj.AspectJExpressionPointcut.checkReadyToMatch(AspectJExpressionPointcut.java:181)
at org.springframework.aop.aspectj.AspectJExpressionPointcut.getClassFilter(AspectJExpressionPointcut.java:162)
at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:200)
at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:254)
at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:286)
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:117)
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:87)
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:68)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:359)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:407)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1426)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
... 11 more[/color]
后来看Spring Recipes Covers Spring Framework 3后调用里边儿的方法又对了，更改后的AOP如下
package com.zy.spring;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.annotation.Before;

/***
* 定义切面aspect
*
* @author Douglas Lau
*
*/

@Aspect
public class SecurityHandler {

/***
* 定义Advice，标识在那些切个切入点何处技入此方法
*/
@Before("execution(* addUser(..))")
private void checkSecurity() {
System.out.println("---------安全性检查------------");
}

}
后成功了，现在还找不到原因何在，目前来说我水平不够！