学习spring security2.0出现异常

Error creating bean with name 'ContactManagerTarget.methodSecurityInterceptor': Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
Caused by: java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
 at org.springframework.security.intercept.method.MethodDefinitionSourceEditor.setAsText(MethodDefinitionSourceEditor.java:72)
 at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:326)
 at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:310)
 at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:192)
 at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:138)
 at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:380)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1106)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:862)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:424)
 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
 at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:244)
 at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:187)
 at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3831)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4323)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
 at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)
 at org.apache.catalina.core.StandardHost.install(StandardHost.java:832)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:701)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)
 at org.apache.catalina.startup.HostConfig.start(HostConfig.java:983)
 at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)
 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
 at org.apache.catalina.core.StandardService.start(StandardService.java:480)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)

官方例子没有错误，我把原先acegi1.07的改用spring secruity2.0出现异常

解决：加入spring-aspects.jar