Receiving error: PortletContainerImpl: failed to run the portlet: 'IDMLoginPortlet'

If a request to the IDMLogin portlet contains a populated http Authorization:

header,http://hostname:port/IDM/portal/protlet/IDMLoginPortlet, the

IDMLoginPortlet returns to the browser a Status Code 500, unhandled Java

exception in com.novell.afw.portal.exception.EboPortletActionException:

PortletContainerImpl: failed to run the portlet: 'IDMLoginPortlet'.

Products such as Novell Access Manager, Novell iChain or others typically

populate the Authorization: header for SSO purposes.

This exception does not occur when simply browsing to /ID

If a request is going to IDMLogin portlet directly, it will fail. Notice that if the request is to any other URL, then it works as single sign-on.

In our code, we redirect a request to login portlet automatically and put the original request's URL in a internal request chain (which holds a chain of requests that need to be done one by one). So that after login, we can redirect again to the original URL. This will make the login transparent to the user, as it looks like user goes directly to the original requested URL (and also logged in).
However, there is a special case: the original request *is* to login portlet, then we don't need to put original request URL in request chain, we put a "null" in request chain, which causes the problem later.