Java - how to get IP address automaticallly in JNLP file?

Question

In the JNLP file how do I get the IP address automatically? Example:

Answer 1

It can't do that.

You can add a DNS entry for 10.10.10.1, and put the hostname in that field instead of the IP address, but it's just XML - there's no way to call a method from that line to run code and figure out what IP address it should connect to.