InetAddress.getLocalHost() throws UnknownHostException

Question

I am testing our server-application (written Java) on different operating systems and thought that OpenSolaris (2008.11) would be the least troublesome due to the nice Java integration. Turns out I was wrong, as I end up with a UnknownHostException

try {   computerName = InetAddress.getLocalHost().getHostName();   if (computerName.indexOf(".") > -1)     computerName = computerName.substring(0,         computerName.indexOf(".")).toUpperCase(); } catch (UnknownHostException e) {   e.printStackTrace(); } 

The output is:

java.net.UnknownHostException: desvearth01: desvearth01     at java.net.InetAddress.getLocalHost(InetAddress.java:1353) 

However, nslookup desvearth01 returns the correct IP address, and nslookup localhost returns 127.0.0.1 as expected. Also, the same code works perfectly on FreeBSD. Is there anything special to OpenSolaris that I am not aware of?

Any hints appreciated, thanks.

Answer 1

In good tradition, I can answer my own question once again:

It seems that InetAddress.getLocalHost() ignores the /etc/resolv.conf, but only looks at the /etc/hosts file (where I hadn't specified anything besides localhost). Adding the IP and hostname to this file solves the problem and the exception is gone.

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Another answer is almost correct and I got hint from above and my problem get resolved...Thanks.

But to improve this, I am adding steps-by-steps changes, so that it will be helpful for even naive users.

Steps:

• Open /etc/hosts, the entries might look like below.

   127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6 

• You need to add one more line above of this by any editor like vi or gedit (e.g. <your-machine-ip> <your-machine-name> localhost).

   192.168.1.73 my_foo localhost 

Now, overall file may look like this:

192.168.1.73 my_foo localhost 127.0.0.1    localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1          localhost localhost.localdomain localhost6 localhost6.localdomain6 

• Just save it and run again your Java code... your work is done.