Even if you can answer this is general, I don't think it will do you any good. Suppose you have a scenerio such as:
1) call routine to check that remote RMI server is up.
2) if not up, print error message and take a nap for a while, go to 1)
3) prepare to download, make sure there is enough disk space locally to store, etc.
4) start the download
5) save the results
What happens if the remote RMI server goes away, crashes, network failure, etc. between 1) and 4)?
More importantly, why are you thinking of using RMI for this?
subject: How to check whether the RMI Server is running or not ?