UnknownHostException: name or service not known

Question

I\'m attempting to return some data from an API using OkHttpClient in com.squareup.okhttp. I\'ve run into a few errors that i have eventually been able to overcome but i can\'t

Answer 1

For error like "java.net.UnknownHostException: [hostname]"

The reason is your hostname is not in /etc/hosts, The solution is simple:

sudo vim /etc/hosts

change the line looks like:

127.0.0.1  localhost

to:

127.0.0.1  [hostname] localhost

Save and exit. If the problem still exist, may be you need to restart or run :

sudo ifconfig eth0 down&&sudo ifconfig eth0 up

Hope it can help you!