run mvn clean package to generate gs-spring-boot-docker-0.1.0.jar in target folder
run docker build . -t testimage to generate the docker image
run docker run -ti -p 7000:7000 -p 8080:8080 -p 8000:8000 testimage to start the container
install vscode-java-remote-debugger-0.0.4.vsix in vscode, restart vscode and open current folder
open java file src/main/java/hello/Application.java and wait some time(less then 1 minute for java language server), then set breakpoint on line 19, press F5, and open a command line to input curl http://localhost:8080