when exit of application I can't newly do login using DataSourceRealm

Hi all,
I am experimenting a rare behaviour with my application, when one user
logout and try login newly, fails!
I did the same question on other forums, where I received that " when you
use JEE-standard Container security, the user should not explicitly request
the login/loginfail pages. It won't work right." however I did that works
with others jee servers, then I start to think that maybe is something
misconfigured in Apache Tomee.
In details, this is happening:
when one user exit from application and try to do login newly, this one
thrown this error:


* http://localhost:8080/appweb/privado/j_security_check
<http://localhost:8080/appweb/privado/j_security_check> *

But if in the address bar, I delete the portion that says "/private/logout"
then it starts correctly!
In servlet that execute when the user choice exit I do this:
   HttpSession session = request.getSession();
   session.invalidate();

   request.getRequestDispatcher("/login.jsp").forward(request, response);

Any Ideas what is happening?
Thanks in advance any suggestion!
Regards