[java] How to configure port for a Spring Boot application

If you are going to run apps as jar file in command environment, just type "SERVER_PORT=*** " as prefix. The full command to execute will look like below:

SERVER_PORT=8080 java -jar ***.jar

If you wanna run app in background in Linux, command with 'nohup' will look like below:

SERVER_PORT=8080 nohup java -jar ***.jar &

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