Spring Security XML错误-cvc-complex-type.2.4.a：发现无效的内容（从元素“ csrf”开始）

我在我的Web应用程序项目中使用Spring Security。我想在我的Spring应用程序中启用csrf保护。我的application-context-security.xml如下

<?xml version="1.0" encoding="UTF-8"?>

<beans:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                        http://www.springframework.org/schema/security
                         http://www.springframework.org/schema/security/spring-security-3.0.xsd">

    <global-method-security secured-annotations="enabled"/> 

    <http disable-url-rewriting="true" auto-config="false" access-decision-manager-ref="accessDecisionManager" entry-point-ref="authenticationEntryPoint">
        <intercept-url pattern="/" access="IS_AUTHENTICATED_ANONYMOUSLY, IS_AUTHENTICATED_FULLY, IS_AUTHENTICATED_REMEMBERED"/>
        <intercept-url pattern="/j_spring_security_check" access="IS_AUTHENTICATED_ANONYMOUSLY"/>
        <intercept-url pattern="/j_spring_security_logout" access="IS_AUTHENTICATED_ANONYMOUSLY, IS_AUTHENTICATED_FULLY, IS_AUTHENTICATED_REMEMBERED"/>
<!-- Enable CSRF protection -->
        <csrf />
    <access-denied-handler ref="accessDeniedHandler"/>         
    </http>
<!-- Remaining information -->
</beans:beans>

我正在为项目使用Spring 3.0.5 jar。

但是在运行时，出现以下错误

SEVERE: Exception sending context initialized event to listener 
instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException:
 nested exception is org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: 
Invalid content was found starting with element 'csrf'. 
One of 
'{"http://www.springframework.org/schema/security":intercept-url,
 "http://www.springframework.org/schema/security":access-denied-handler, 
"http://www.springframework.org/schema/security":form-login, 
"http://www.springframework.org/schema/security":openid-login, 
"http://www.springframework.org/schema/security":x509, 
"http://www.springframework.org/schema/security":http-basic, 
"http://www.springframework.org/schema/security":logout, 
"http://www.springframework.org/schema/security":session-management, 
"http://www.springframework.org/schema/security":remember-me, 
"http://www.springframework.org/schema/security":anonymous, 
"http://www.springframework.org/schema/security":port-mappings, 
"http://www.springframework.org/schema/security":custom-filter, 
"http://www.springframework.org/schema/security":request-cache}' 
is expected.

我尝试在Google上搜索此错误。我找到了两个类似的地方，但是他们都说错误是由于Spring 3.2+中的某些更改引起的。但是，就我而言，我正在使用Spring 3.0.5。

任何帮助，将不胜感激。