CODEWITHSUNDEEP
javalinuxhostsdnsjava
artspb
artspb

Reputation: 1157

dnsjava can't resolve "localhost" on Linux machine

After I registered dnsjava as default Java DNS provider I get a problem. It can't resolve local addresses which described in /etc/hosts file on my Linux machine. This file look something like this:

127.0.0.1   localhost
127.0.1.1   servername

So if I try to resolve one of such names UnknownHostException happens:

org.xbill.DNS.Address.getByName("localhost");
org.xbill.DNS.Address.getByName("servername");

It's not a problem when you're using dnsjava along with default dns provider. Being a sole provider, dnsjava causes lots of errors in default libraries, which turn out to be highly dependent on localhost resolution capability. So, the question is: how to change behavior of dnsjava to resolve local hostnames?

Edit. Next code works fine:

java.net.InetAddress.getByName("localhost");

But java.net.InetAddress.getLocalHost() method throws:

java.net.UnknownHostException: servername

Upvotes: 0

Views: 2448

Answers (1)

Brian Roach
Brian Roach

Reputation: 76898

dnsjava is a DNS client library; it talks to DNS servers. /etc/hosts is not part of the DNS protocol nor does dnsjava know anything about it.

See this old post on a the dnsjava users mailing list from the guy who wrote it: http://old.nabble.com/DNS-Resolve-from-hosts-file-first-then-DNS-Server-td15431381.html

Nothing has changed in that regard.

If java.net.InetAddress.getByName() is working, then your DNS server is configured to respond to queries for localhost.

Upvotes: 1

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