<tomcat-users>
    <user name="lala" password="lala!!!" roles="admin-gui,manager-gui" />
    <role rolename="administrator"/>
    <user username="admin" password="admin" roles="administrator"/>
</tomcat-users>

under <host>:
<Realm className="com.bannerplay.beans.Admin">

<form method="post" action="j_security_check">
            <p>
                Enter user ID and password:<br/> <br/>
                User ID <input type="text" name="j_username"/>
                Password  <input type="password" name="j_password"/> <br/><br/>
                <input type="submit" value="Login"/>
            </p>

        </form>

...
<security-constraint>
    <display-name>Admin</display-name>
    <web-resource-collection>
        <web-resource-name>BannerPlay administration Tool</web-resource-name>
        <description/>
        <url-pattern>/admin/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
        <description/>
        <role-name>administrator</role-name>
    </auth-constraint>
</security-constraint>
<login-config>
    <auth-method>FORM</auth-method>
    <realm-name>com.bannerplay.beans.Admin</realm-name>
    <form-login-config>
        <form-login-page>/faces/login.xhtml</form-login-page>
        <form-error-page>/faces/login.xhtml</form-error-page>
    </form-login-config>
</login-config>
<security-role>
    <description/>
    <role-name>administrator</role-name>
</security-role>