Using windows account logon for SSO

Hi All !

I'm implementing a SSO solution and the scenario is as follow:

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I'm in a Windows 2003 domain with a BW 3.5 server, additional I installed a Java Add-In to implement SPNego authentification. The solution works fine! but the problem is that the user needs to provide user and password. When the user provide user id and password the SPNego resolve the account and create a logon ticket and is passed to BW very well.

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I'm wondering if it is possible to eliminate the login question.

How can I get the logged user in windows?

I'm working with J2EE 6.40 SP21

Thanks in advance.