Problem getting my GWT RPC to work when I deploy to app engine

I have been following the StockWatcher tutorial and have an RPC service on my local server which is successfully invoked when I open my HTML page and add a new stock.
Now,  I deployed my app to the GAE but when I go to the same page on the GAE hosted app it no longer calls the RPC service.  What must I change in my app to tell the GWT generated JavaScript, you are now running on the GAE and so call the RPC service on the GAE.
My GAE app url is
http://stockwatcherjf.appspot.com/StockWatcher.html

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