Whitelabel Error Page after refresh in spring boot web application

I am getting error as after refreshing http://localhost:8080/apiName url.It working for first call after if we refresh page it give following error

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Jan 29 15:12:58 IST 2019 There was an unexpected error (type=Not Found, status=404). No message available

My project structure is as follow.

I tried putting content of static under src/main/webapp..but didn't worked.