Spring security: A universal match pattern ('/**') is defined before other patterns in the filter chain, causing them to be ignored.

Spring security: A universal match pattern ('/**') is defined before other
patterns in the filter chain, causing them to be ignored.

I am trying to configure spring security on my simple app, but I keep
getting this error.
Caused by: java.lang.IllegalArgumentException: A universal match pattern
('/**') is defined before other patterns in the filter chain, causing
them to be ignored. Please check the ordering in your <security:http>
namespace or FilterChainProxy bean configuration
I have seen other similar posts, but could not figure out why I am getting
this error. I don't seems to have duplicate security:http namespace
configured.
Here goes my web.xml
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>sampler</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:**/sampler-context.xml
classpath:**/sampler-security.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>sampler</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>sampler</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<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>/*</url-pattern>
</filter-mapping>
spring security config:
<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-3.1.xsd">
<!-- Add Authentication Manager -->
<authentication-manager>
<authentication-provider>
<user-service>
<user name="admin" authorities="ROLE_USER" password="test"/>
</user-service>
</authentication-provider>
</authentication-manager>
<!-- This would add login screen -->
<http auto-config="true">
<intercept-url pattern="/admin/*" access="ROLE_USER"/>
</http>
Its just a simple login functionality that I wanted to provide as of now.
Any help around this issue would be really appreciated.