Why does "request.getUserPrincipal().getName()" sometimes return a blank string?

Has somebody an idea, why the getName() method of the UserPrincipal sometimes provides an empty String? Most of the time it re开发者_如何学运维turns the correct user name but not every time.

This behaviour does occur randomly. I can start the application, run the command and it works. The next time I start the application and run the command (exactly the same way as before!) it does not work.

Any ideas?

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The part where you say, "...start the application and run the command..." is unclear.

What precisely are the steps involved?

HTTP is a text-based protocol. If you capture and observe the requests and responses, I am certain you would observe a difference to which the behavior could be attributed.

My suggestion is to gather more detailed information to point you in the direction of the solution.