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I was upgrading my application from Spring 2.5.6 + Spring Security 2.0.x to the latest 3.0 RC releases. After modifying my Maven pom.xml files to accomodate for the new artifact naming conventions, I still couldn’t get my application context to load due to a SAX exception:

org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 37 in XML document from class path resource [security-config.xml] is invalid; nested exception is org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'security:authentication-provider'.

I found myself spending almost an hour trying to figure out what’s wrong with my configuration file. Was I missing a JAR file? no, everything seems to be in its right place (you WILL want to make sure that you’re including spring-security-config.jar, though!), Eclipse didn’t detect anything wrong with the config file. In my despair, I turned to Security Namespace Configuration chapter of the Spring Security 3 reference manual. There I noticed the following paragraph:

  <authentication-manager>
    <authentication-provider>
      <user-service>
        <user name="jimi" password="jimispassword" authorities="ROLE_USER, ROLE_ADMIN" />
        <user name="bob" password="bobspassword" authorities="ROLE_USER" />
      </user-service>
    </authentication-provider>
  </authentication-manager>

Turning to my own configuration file, I saw this:

<security:authentication-provider user-service-ref="userService">
   <security:password-encoder ref="passwordEncoder">
      <security:salt-source user-property="username"/>
   </security:password-encoder>
</security:authentication-provider>

<security:authentication-manager alias="authenticationManager"/>

Apparently, while in Spring Security 2.x the authentication-provider tag used to be a root-level citizen, now it must live inside the authentication-manager definition.

I hope this will save some other folks some time when migrating to the 3.x Spring stack.