Yes,

just write your own extension of org.apache.catalina.Realm (or extend
o.a.c.realm.RealmBase)and read:

> http://jakarta.apache.org/tomcat/tomcat-5.0-doc/realm-howto.html


then follow the instruction on how to install your own valve (search
the list :-) )

-- Jeanfrancois

Carl Howells wrote:

> Is it possible to set the Principal and Roles for a session in a
> manner which will satisfy a <role-name> security constraint
> programmatically? At all? I don't mind ignoring the servlet spec and
> doing something tomcat-specific. This is something that vitally needs
> to be done on my project.
>
> Thanks for any solutions...
>
> Carl Howells
>
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