Add the following to src> main> resources> application.yml.
application.yml
server:
port : 8081
Run and verify that it has changed from the default port 8080.
$ curl http://localhost:8080/
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- 0:00:03 --:--:-- 0
curl: (7) Failed to connect to localhost port 8080: Connection refused
$ curl http://localhost:8081/
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 13 100 13 0 0 149 0 --:--:-- --:--:-- --:--:-- 149
Hello World!
In the case of src> main> resources> application.properties, write as follows.
application.properties
server.port=8081
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