https://jeong-pro.tistory.com/182 의 블로그를 참조하며 헤로쿠 배포 진행

1) invalid source release: 11

remote: * What went wrong:
remote: Execution failed for task ':compileJava'.
remote: > invalid source release: 11

참고 : https://stackoverflow.com/questions/67932932/how-to-resolve-compilejava-errors-during-heroku-deployment

2) 자바 버전 문제

remote: symbol: method of()
remote: location: interface List

참고 : https://devcenter.heroku.com/articles/java-support#specifying-a-java-version

이 파일 만들어서

폴더에 추가해주고 git add . git commit -m 진행하면 완료

잘 배포됨

https://devcenter.heroku.com/articles/java-support#specifying-a-java-version

3) 포트 설정 문제

2022-03-23T07:36:25.295831+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=eci-server.herokuapp.com request_id=717a18d4-80d0-4fab-a8d4-861c170d216b fwd="163.239.255.161" dyno= connect= service= status=503 bytes= protocol=https

난 이렇게 돼있었다

https://devcenter.heroku.com/articles/setting-the-http-port-for-java-applications

여기서 말해준 대로

server:
    port: $PORT

error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=eci-server.herokuapp.com request_id=1b1261c3-d0e6-4367-b917-16cb7e68a5e3 fwd="163.239.255.161" dyno= connect= service= status=503 bytes= protocol=https

git push heroku master