Issue while implementing spring security

I am using GWT at my client side and spring 2.5.6 at my server side. I want to submit data using the https protocol hence I wish to use spring security. When I run the application in hosted mode I get the following exception.

Code:
org.springframework.beans.factory.parsing.BeanDefi nitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/security]

My spring-servlet.xml is as follows:

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:security="http://www.springframework.org/schema/security"
        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-2.0.4.xsd">

       
        <security:http>
                <security:intercept-url pattern="/gwtapplication/springActivitybyJsp.rpc" requires-channel="https"/>
          </security:http>
       
        <!-- Handler for GWT RPC calls  -->
        <!-- These calls can be routed to the same controller which handles the HTTP requests -->
   
    <!-- User Defined Bean which extends from MultiActionController -->
    <bean id="SpringActivityController"
                  class="com.gwt.test.server.SpringActivityController" >
                  <property name="methodNameResolver" ref="paramResolver"/>
                  <property name="service" ref="userService"/>
    </bean>
   
       
    <!-- ParameterMethodNameResolver decides which method is to be called depending on the request parameter "method" -->
   
    <bean id="paramResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
            <property name="paramName" value="method"/>
    </bean>
                 
       
        <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
              <property name="mappings">
              <props>
                              <prop key = "/gwtapplication/loginActivitybyJsp.rpc">
                                      SpringActivityController
                              </prop>
              </props>
              </property>
  </bean>

</beans>

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My web.xml is as follows:

Code:

Code:

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

<web-app>

        <context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>/WEB-INF/spring-servlet.xml,/WEB-INF/spring-service.xml,/WEB-INF/spring-dao.xml</param-value>
               
        </context-param>


        <listener>
                <listener-class>
                        org.springframework.web.context.ContextLoaderListener
        </listener-class>
        </listener>
  <!-- Default page to serve -->
  <welcome-file-list>
    <welcome-file>/WEB-INF/test1.jsp<!-- GWTApplication.html --></welcome-file>
  </welcome-file-list>
 
          <filter>
                <filter-name>springSecurityFilterChain</filter-name>
                <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
        </filter>
        <filter-mapping>
                <filter-name>springSecurityFilterChain</filter-name>
                <url-pattern>/loginActivity*</url-pattern>
        </filter-mapping>
 
 
  <!-- Servlets -->
          <!-- Testing spring rmi with gwt -->
        <servlet>
            <servlet-name>GWTSpring</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <load-on-startup>1</load-on-startup>
    </servlet>
   
    <servlet-mapping>
              <servlet-name>GWTSpring</servlet-name>
              <url-pattern>*.rpc</url-pattern>
    </servlet-mapping>
   
</web-app>

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Please advise.