java.lang.Exception???

Getting the same thing on two different computers.

I wonder if the password authentication servers are down or something?

received the same error. redownloaded and installed iTunes 7.3.1 from iTunes website. resolved issue...

iBook Mac OS X (10.4.10)

First, try just quitting iTunes (you may want to restart your system) and try again.

If that doesn't fix the problem. click on your account name in the top right corner of the iTunes window. When a second window appears asking for your password, hit "logout" instead. Then click on the "login" in the top right corner again and type in your user name and password. Then try logging in again. If it still doesn't work, repeat the process two or three times and see if that will eventually clear the error (it did for other users who've had the same problem in the past).

Hope this helps.

The only way I found to get around this problem was to go back to iTunes 7.2. All my problems went away, and my Apple TV works just fine with this version.

I found iTunes 7.2 here: http://www.oldapps.com/downloadiTunesmac.php

I was trying to buy something after upgrading to iTunes 7.3.1 (3), and when it asked me for a password for my .Mac account, it returned in red letters:
"FieldName: null.java.lang.Exception"

Maybe this is a bug that apple needs to address.

But meanwhile, Dave, you advice worked. I did a shutdown, boot-up, opened iTunes, signed out, signed in, got the same error, signed out, signed in, and it let me through! Yaay!

So getting iTunes working for me is critical, since in a few weeks, Apple will be UPS'ing my new iPhone to me!

Thanks again, Dave! (and I hope the solution cures this problem).

MacBook 2GHz Intel C2D 1GB 667MHz DDR2 SDRAM Mac OS X (10.4.10)