How do I get the Hostname in Java?

[cpjust]

I'm trying to find the best way of getting the system's Hostname in Java.
I haven't found a function specifically for it, which is strange, I would have expected that would be common enough to be in there somewhere.

I tried this not so portable way to get it on UNIX:

System.out.println( "HOSTNAME = " + System.getenv( "HOSTNAME" ) );

But for some reason it prints "HOSTNAME = null".

I also tried this way which sort of works, except on my Linux desktop where it returns the vmnet8 adapter name instead of the real hostname:

	static String GetMachineName() throws SocketException
	{
		String name = null;
		Enumeration<NetworkInterface> enet = NetworkInterface.getNetworkInterfaces();

		while ( enet.hasMoreElements() && (name == null) )
		{
			NetworkInterface net = enet.nextElement();

			if ( net.isLoopback() )
				continue;

			Enumeration<InetAddress> eaddr = net.getInetAddresses();

			while ( eaddr.hasMoreElements() )
			{
				InetAddress inet = eaddr.nextElement();

				if ( inet.getCanonicalHostName().equalsIgnoreCase( inet.getHostAddress() ) == false )
				{
					name = inet.getCanonicalHostName();
					break;
				}
			}
		}

		return name;
	}

Any ideas of how to reliably get the hostname in Java?