InetAddress.getLocalHost() slow to run (30+ seconds)

The above answer works on my mac, you can try it like this:

step 1, download inetTester.jar from thoeni/inetTester

step 2, run it on your mac. here is the result on my mac:

$ java -jar ./inetTester.jar
Calling the hostname resolution method...
Method called, hostname MacBook-Pro.local, elapsed time: 5009 (ms)

it takes 5s to run the test, and it shows the hostname of my mac.

step 3, modify the /etc/hosts:

127.0.0.1   MacBook-Pro.local
::1         MacBook-Pro.local

the host is what shows in step 2. and after this, run the test again:

$ java -jar ./inetTester.jar
Calling the hostname resolution method...
Method called, hostname MacBook-Pro.local, elapsed time: 6 (ms)

yeah, it comes with only 6ms.

This problem appears on MacOS Sierra using Java8, updates equals or bigger than 60 (jdk1.8.0_60.jdk, jdk1.8.0_77.jdk, etc).

The solution can be found here: https://github.com/thoeni/inetTester.

This is the content of my /etc/hosts file:

127.0.0.1   localhost mac.local
::1         localhost mac.local

In my case, mac is my computer name.

The issue can be solved by adding the following to /etc/hosts (assuming output of hostname command is my-macbook:

127.0.0.1   my-macbook
::1         my-macbook

This returns the time to something more suitable (< 1 second)