[JAVA] Spring Boot gradle build with Docker

For a long time the build was maven, but as a reminder I needed to use gradle Gradle build Spring Boot using docker The procedure for making a multi-stage build and deploying to Cloud Run or ECS will be released at a later date

Creating a Spring Boot project

Spring Initializr https://start.spring.io/ Create a template for your Spring Boot project using

Change to Gradle Project
Select Spring Web from ADD DEPENDENCIES ...


Click GENERATE to start downloading the zip file The unzipped contents are the project file

Open project

Open a project with a text editor or IDE This time I will describe the procedure of IntelliJ IDEA which I do not usually use

File → New → Project from Existing Source → Select the unzipped folder → Open Check Import project from external model → Select Gradle → Finish

Controller added

Since there is no controller in the initial state, we will add a controller that returns a simple character string Create HelloController.java in the same package as ~ Application.java under project/src/main ...


package com.example.demo;

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

public class HelloController {

    public String index() {
        return "Hello Spring Boot!";


If you are using the IDE, you can run the Spring Boot application at this point and check the operation. Run the application and access localhost: 8080 Hello Spring Boot! Is displayed, it is operating normally.

In case of IntelliJ IDEA, it can be executed from Gradle on the far right

Dockerfile creation

Create a Dockerfile directly under the project A simple image that just copies the file and executes the build command


FROM gradle:6.7.1-jdk11
COPY --chown=gradle:gradle . /home/gradle/src
WORKDIR /home/gradle/src
CMD ["gradle", "build", "bootJar"]

Using gradle: 6.7.1-jre11 as base image causes nullpo during build The image of jdk is big, so I want to avoid it if it is true

Docker build & launch

In the console, change to the project directory and execute the following command

docker build -t bootbuilder:v0.1 . 
docker run -it --rm -v "$PWD":/home/gradle/src bootbuilder:v0.1

Build complete if jar is created in ~ build/libs

Reference material


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