I am not sure about the value in jbpm3. Long time back I used it but I think /jbpm-console/upload is there by default and I never needed to change it. Please make sure that the server is on and the port value in the deployment tab matches with that of jboss.
I tried /jbpm-console/upload, however, when I type Test Connection. It shows the following error message.
The server can be reached, but the deployer seems unavailable.