How to build Docker + Springboot app (for basic learning)


Recently, I haven't had the opportunity to build the source from scratch for maintenance and document creation, and I tend to forget about the basics.

At that time, I happened to watch this video.

How to create Docker Image and run Java App (Spring Boot Jar) in a Docker Engine | Tech Primers(2017)

The content of the video is very easy to understand, and by the way, I remembered that I had never made it from scratch, so I carried out construction work for studying.

Construction requirements

Make the Springboot app run on the Docker container. Make it accessible from the outside with the Rest API.

DockerDesktop setup

Allow Docker to run in a windows environment.


Can be downloaded from this official Start [Docker Desktop Installer.exe] and follow the procedure

Start Docker

Start by rebooting after the installer

ProxySetUp (if needed)

Add proxies and below to the ~ / .docker / config.json file.

  "credsStore": "desktop",
  "stackOrchestrator": "swarm",
  "credStore": "desktop",
	     "httpProxy": "",
	     "httpsProxy": "",
	     "noProxy": "*,"

Springboot initial build

○ Create a Spring boot Project

Added Rest Repository to Dependency to create RestAPI.

  • Add a library that suits your purpose.


After making the settings, press the GENERATE button to download the ZIP file.

Place locally


Create sample module for Rest

Create a controller package under poc.dockerspringboot and create a sample file

package poc.dockerspringboot.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

public class HelloWorldOnDocker {

    public String hello(){
        return "Hello from Docker Container";

Perform maven build

Perform mvn clean install image.png

Docker File setup

Creating a Docker File

Create a Dockerfile directly under the project


Creation example

FROM adoptopenjdk:11-jre-openj9
ADD target/docker-springboot.jar docker-springboot.jar
ENTRYPOINT ["java", "-jar", "docker-springboot.jar"]

FROM: Specify base image (Java)

In OpenJDK, use adoptopenjdk that can be used for commercial purposes.

ADD: Add module

Add the generated module to Docker. A module is created under target, but since the file name of jar is long, specify the output name with [finalName].


Reference: Spring-boot-maven-plugin setting information

EXPOSE: Port for external disclosure

Specify the port you want to open in the Docker container

Inside the container, the default port when spring-boot starts is 8080 If you want to change this value, add server.port = 8082 etc. to

When Docker is started, the port that is started internally and the port that is open to the outside are linked.

ENTRYPOINT: Start point

Start the module with the jar command. By executing this command, the embedded server (Tomcat) will start and accept access.

Container startup

#Image creation
docker build -f Dockerfile -t docker-spring-boot .

#Confirmation of creation
docker images

#Container startup
docker run -p 8081:8080 docker-spring-boot

Access confirmation

http://localhost:8081/rest/message/helloWorldOnDocker image.png


There are no new technical discoveries, but occasionally doing this kind of work clears your thinking. Described as a guideline so that it can be transferred later.

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