getServletContext().getRealPath(File.separator) returns null in 2.6.1

I just updated my 2.5.1  GWT app to 2.6.1.  It all seems to work fine except that on the server side in my RPC handling code getServletContext().getRealPath(File.separator) returns null in 2.6.1 whereas in 2.5.1 it returned the local path: C:\Users\Paul\workspace\MyApp\war

Any idea how to correct this?

Note: When deployed out to my Tomcat linux sever it works correctly.  The problem is only when running from Eclipse in dev mode.

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