My filesystem:

Dropbox\                           # the path to this directory can change!
        Apps\
             eclipse\
                     eclipse.exe
        Java\                      #this is my workspace
             securechannelfacade\  #project 1
             submit\               #project 2

Relative to eclipse.exe the path "..\..\Java" refers to my workspace.

My goal: open the two projects with relative paths, so when the top directory (Dropbox) changes, the project's file references don't break.

My problem: When I go to: "File > Import..." and select "General > Existing Projects into Workspace" and type my relative directory "..\..\Java" in the root directory field, select all projects, and click the Finish button, I get this error message:

    Invalid project description.
        'Java/temp/securechannelfacade' is not a valid location. The location is relative to undefined workspace path variable 'Java'.

    Screenshot of the error: http://dl.dropbox.com/u/2925840/Eclipse.png