[Molz]

Hi-
I am trying to write a little network program and I need to get the local IP of the host. I tried to do a

InetAddress add = InetAddress.getLocalHost ();

This works on Solaris and HP-UX but on OS X it throws a UnknownHostException. Another point is that on the solaris and HP-UX boxes the network connections are through ethernet and are always on, with my OS X box the connection is through my modem using ppp. Could this be a factor? Thanks for any help you can provide.

[gralem]

I'm bringing this to the top of the heap. I'm having a similar problem with the java InetAddress class. If I do:

InetAddress add = InetAddress.getLocalHost ();

I always get the lo0 device (.toString() gives "Localhost/127.0.0.1"). Is there a bug in the implementation of this on OS X?

---gralem

[Kristoff]

1) Molz, the UnknownHostException is thrown to indicate that the IP address of a host could not be determined. This is a combination of the fact that you are connected via PPP and the problem below. Not so much that PPP is a problem, but add it to the problem below, and you have your situation.

2) gralem, I have a feeling that this problem is related to a problem I have been complaining about in these forums (and to Apple directly) for a while. For more info on what I am talking about, search these forums for a thread called something like "sick and tired of localhost".


Basically, in both cases, we are seeing that the underlying BSD system has no freaking clue as to your real hostname. So, this is not a JDK issue, but an OS X issue, that I have been complaining about for some time. This is a perfect example of why Apple needs to fix this.