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How to implement SSO in a web application using Spring Security

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I have a web application which uses spring security to authenticate the user. My application is using a custom authentication entry point.
e.g MyCustomAuthenticationEntryPoint (which extends LoginUrlAuthenticationEntryPoint).
Below is spring security config snippet:
 <bean id="authenticationEntryPoint"
       class="my.code.MyCustomAuthenticationEntryPoint ">

In this I have overridden determineUrlToUseForThisRequest() method to give my login screen urls.

All works fine if I login successfully. ie, if I login successfully, then this entry point (MyCustomAuthenticationEntryPoint ) is not caller again as I am already authenticated. If I am not authenticated then this entry point is called to trigger spring security authentication processing.

Now I have a SSO requirement. The requirement is that in certain scenario, authentication will be done externally and I do not have to authenticate the user again. I have implemented a filter as below :

Issue: Even after I set the authentication in  SecurityContextHolder.getContext().setAuthentication() , even then my MyCustomAuthenticationEntryPoint. I think this should not be called as I have implemented pre-authentication.

Can anyone help why this might be happening?
I am using spring security 3.0.

Don't get me started about those stupid light bulbs.
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