I'm getting FailedDownloadException when I try to run XStudio!

It means that you can't download the resources necessary to run XStudio.
If your apache server and you MySql server are hosted on the same computer, check that you have the same IP@ or name in:

• the URL you're browsing
• xstudio.jnlp
• xstudio.conf

Try to avoid using localhost or 127.0.0.1 this often brings confusion.