
1. Using existing Homepage https://start.spring.io/ - Setting Project, Language, spring boot version, and dependency - Click Generate the project to download with .Zip and unzip as folder - Open folder with Development tool(like IntelliJ, Eclipse) 2. Using IntelliJ - Go File -> New -> Project - Choose Spring Initializr - Choose Type, Language, dependency - create Project Automatically And https:..

I create new project with IntelliJ's spring initializer (link : https://start.spring.io/ ) And main function is automatically generate, but runApplication does not configured because below can't import. import org.springframework.boot.runApplication As a result, I upgrade spring boot version from 1.x.x to 2.0.4.RELEASE and problem resolved.
Trouble Shooting history When I run gradle, I got below message. $ Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.So, first I put --warning-mode=all to gradle command like below. $ ./gradlew clean build --warning-mode=allAnd I find DefaultSourceDirectorySet class's constructor has been deprecated (below detail message) Configure project : The Defau..