NamespaceHandler « Security « Spring Q&A

1. Spring 3.0 - Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/security]    stackoverflow.com

Any ideas what could be the cause of this?

Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/security]

org.springframework.web.context.ContextLoader initWebApplicationContext: Context initialization failed
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to ...

2. Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/security]    stackoverflow.com

I am developing my first application in spring security.... My applicationContext-security.xml file looks like this

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

<!--
  -  Namespace-based OpenID configuration
  -->

<b:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:b="http://www.springframework.org/schema/beans"
 ...