Points To Remember Default port for spring boot application is 8080. You can change the port number in the following ways from application.properties command line arguments How to run Spring boot application to custom port In order to run a spring boot application on a custom port you can specify the port in application.properties. server.port=8090 If you are using environment specific properties file then you can define server.port property in each of your properties file. You can alternatively set the port from command line arguments like below gradle -Dserver.port=8090 bootRun This will override any configuration of port given inside the properties file or application.yml file.