Hi,
I'm testing Identity Federation with a simple application, and I have not been able to get a Principal at the Service Provider once logged in, then I'm not able to access any link even if I'm authenticated, as:

if(principal == null)
 {
 String destination = createSAMLRequestMessage( relayState, response);
 HTTPRedirectUtil.sendRedirectForRequestor(destination, response);

 return false;
 }