Hey,
Im having some trouble downloading the PDFs.. every time i try to download any of the ebooks available i get the following error:

Error 500--Internal Server Error
java.lang.NullPointerException
at portal.services.impl.NavigationRedirectorImpl.redirect(NavigationRedirectorImpl.java:119)
(... stack trace)

The file i wanted was the J2EE Architects Handbook.
Can anyone help me?

Thanks
Luiz