<user username="admin" password="admin" roles="manager-gui,admin-gui"/>

?xml version="1.0" encoding="UTF-8"?>
  <web-app>
    <security-constraint>
        <web-resource-collection>
            <web-resource-name>Role Authenticate</web-resource-name>
            <url-pattern>/index.jsp</url-pattern>
            <url-pattern>/logout.jsp</url-pattern>
            <http-method>GET</http-method>
            <http-method>POST</http-method>
        </web-resource-collection>
        <auth-constraint>
            <role-name>user</role-name>
            <role-name>admin</role-name>
        </auth-constraint>
    </security-constraint>


    <login-config>
        <auth-method>FORM</auth-method>
        <realm-name>Authentication</realm-name>
        <form-login-config>
            <form-login-page>/login.jsp</form-login-page>
            <form-error-page>/error.jsp</form-error-page>
        </form-login-config>
    </login-config>

    <welcome-file-list>
        <welcome-file>welcome.jsp</welcome-file>
    </welcome-file-list>
  </web-app>