[rules-users] role based authentication in tomcat

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Hi,

I configured my guvnor in tomcat 6.0.It is working fine with out any  user
name validation.now i just want to create a role and give permission to that
role.
In the components.xml i have changed like the below configuration

<security:role-based-permission-resolver
enable-role-based-authorization="true"/>
<security:identity authenticate-method="#{authenticator.authenticate}"
jaas-config-name="brms"/>

now where i need to create a role with that name "brms" and where i need
mention the username and password.
i tried in the tomcat-users.xml but it is not working.

 could anyone please help me..

regards,
Vamsi Krishna.Kavuri.
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