Facing Problems when using Spring Security in GAE - spring

Question

I am following this article to implement spring security in my GAE project http://blog.springsource.com/2010/08/02/spring-security-in-google-app-engine/
I could not make it work, URLs that i have configured to be protected are not getting protected and application is not redirecting me to google log in page. Here is my web.xml and security-config.xml. Please help, as i have already spent lot of time on this. I think there is some small issue which i am unable to catch.
web.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/security-config.xml
</param-value>
</context-param>
<!-- Enables Spring Security -->
<filter>
<filter-name>authenticationFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<!-- Reads request input using UTF-8 encoding -->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>authenticationFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>controller</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>controller</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
security-config.xml
<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-3.0.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.1.xsd">
<security:http pattern="/static/**" security="none" />
<security:http pattern="/favicon.ico" security="none" />
<security:http use-expressions="true" entry-point-ref="entryPoint"
access-denied-page="/">
<security:intercept-url pattern="/" access="isAuthenticated()" />
<security:intercept-url pattern="/sample"
access="isAuthenticated()" />
<security:custom-filter position="PRE_AUTH_FILTER"
ref="authenticationFilter" />
</security:http>
<bean id="entryPoint"
class="com.generic.gae.security.GoogleAccountsAuthenticationEntryPoint" />
<bean id="authenticationFilter" class="com.generic.gae.security.GaeAuthenticationFilter">
<property name="authenticationManager" ref="authenticationManager" />
</bean>
<security:authentication-manager alias="authenticationManager">
<security:authentication-provider
ref="authenticationProvider" />
</security:authentication-manager>
<bean id="authenticationProvider"
class="com.generic.gae.security.GoogleAccountsAuthenticationProvider" />
Thanks

Answer 1

authenticationFilter defined in security-config.xml is not the one you use in web.xml. Spring Security by default makes the filter bean available to you with name springSecurityFilterChain. So your filter declaration in web.xml should be:
<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>
See section 2.2 of page Security Namespace Configuration