Currently, hudson cannot consume junit xml output anywhere but a subdir of the workspace output

I have a job setup just executing a rake task that kicks off a bunch of spec tests. It's not in any scm, it's just setup to run every 15 minutes and hit a rake file. The rake file generates a series of junit xml at an absolute path, not anywhere near the project workspace, and no matter what I do with the junit xml path, hudson says it doesn't exist. I'm wondering if it's not possible to use absolute paths for the junit xml output