Authenticated appln does not store the user name when the authentication fails

Tested build : 6U1 b3
Tested OS : generic

Steps to reproduce :
1.Install 6U1 b3
2.Run the following appln : http://dispensable.east.sun.com/BasicSecurity/cicerone/Cicerone.jnlp
3.Authentication dialog popsup and asks for the user name and password.
4.Enter the user name as "testuser" and password as "testpassword" and click ok
5.Again authentication dialog popsup
Now the username field does not show the value "testuser"

Expected Behavior : The user name should be stored and displayed in the user name field.

Note : This is a regression from Mustang b77