Java and security

Forgive the rudimentary question about Java, but I haven't used it much at all.

I have a user that wants to use a Java application to read a text file that gets uploaded once a minute to the server from his desktop.
This user doesn't have FTP permissions, so I'm guessing this text file needs to have 0777 for permissions. This has me concerned. If this file is world writable and it gets passed to a Java app (an executable?), then doesn't that put the server at risk?

What about this "once a minute" thing...isn't that excessive?
Does Java need to load into memory like PERL, or does it run differently, so this won't be a hit on the server every time it runs?

Thank you for any assistance. I'm lost on this one.

 

 

 

 

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