How,,,virus Free Ear Files?

One person asked me whether I can guaranty that the web solution that I provide for him, is free of virus attacks.I was willing to use JSF,EJB3 and Hibernates, but I don't have any idea of keeping this web site free of virus. Is it depend on the server security, or can I do something to make it so that it never affected by any virus attack[Customer needs to tell his all customers that the site is free of virus].

As the developer, can I do something to make it, or it depends on the security of the server and the server administrator?

Hi,
I think it depends more on the overall security policy of the server although even your application may be used to compromise the server. Also neither you nor the administrator can ever make it 100% safe. A determined malicious person will possibly find something. Even the most guarded palaces are never 100% safe. It's the security policy that mostly matters.

Regards,

Alex.