title: spring-security-core custom authentication in grails
body: <p>Iam using spring-security-core 2.0 RC5 in my grails application and I added an extra column in the user table named 'approved_fl' I just want check this flag while login, if this flag is P then i need to show a message like 'sorry your account is not yet approved by admin', if this flag is R  then i need to show 'Sorry your account is rejected by admin'. How to configure my spring security plugin for this.</p>