私のapplication-security.xmlファイルは次のとおりです。
<?xml version="1.0" encoding="UTF-8"?>
<!--
- Sample namespace-based configuration
-
- $Id: applicationContext-security.xml 3019 2008-05-01 17:51:48Z luke_t $
-->
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security-3.1.xsd">
<global-method-security secured-annotations="enabled">
</global-method-security>
<!-- Don't set any role restrictions on login.jsp -->
<intercept-url pattern="/login.jsp" access="IS_AUTHENTICATED_ANONYMOUSLY" />
<!-- Restrict access to ALL other pages -->
<intercept-url pattern="/**" access="ROLE_USER" />
<intercept-url pattern="/admin/*.html" access="ROLE_ADMIN" />
<intercept-url pattern="/manager/*.html" access="ROLE_MANAGER" />
<intercept-url pattern="/**.html" access="ROLE_USER,ROLE_ADMIN, ROLE_MANAGER" />
<!-- Set the login page and what to do if login fails -->
<form-login login-page="/login.jsp" authentication-failure-url="/login.jsp?login_error=1" default-target-url="/user/userdashboard/dashboard.html" />
<logout logout-success-url="/login.jsp"/>
</http>
<!--
Usernames/Passwords are
rod/koala
dianne/emu
scott/wombat
peter/opal
-->
**<security:authentication-provider>
<jdbc-user-service data-source-ref="dataSource" />
</security:authentication-provider>**
</beans:beans>
すべて正常に動作しますが、「要素 "security:authentication-provider" のプレフィックス "security" がバインドされていません」という奇妙なエラーが発生します。終了タグを指定しましたが。この問題を解決する方法について手がかりを持っている人はいますか?