spring mvc NoClassDefFoundError: org/springframework/expression/PropertyAccessor

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spring mvc NoClassDefFoundError: org/springframework/expression/PropertyAccessor5

在启动tomcat时spring载入配置时报错，详细的错误信息如下

信息: Loading XML bean definitions from ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]
2012-6-2 19:20:26 org.springframework.web.context.ContextLoader initWebApplicationContext
严重: Context initialization failed
java.lang.NoClassDefFoundError: org/springframework/expression/PropertyAccessor
	at org.springframework.context.support.AbstractApplicationContext.prepareBeanFactory(AbstractApplicationContext.java:538)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:439)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:385)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:284)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4205)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4704)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
	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:754)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
	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:597)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.ClassNotFoundException: org.springframework.expression.PropertyAccessor
	at ....

说是缺少类库，但是在maven dependency中已经加入了，spring web mvc相关的jar引用。