Spring Boot 3.0 API deployment using Jenkins pipeline and Docker

In this story, we’ll explain step by step how to deploy a Spring boot application using Jenkins pipeline and Docker.

· Prerequisites
· Spring boot application setup
∘ Project Structure
∘ Containerize application
· Github
· Configure Jenkins
· Build Jenkins pipeline job
· Conclusion
· References

Prerequisites

This is the list of all the prerequisites for following this story:

• Spring Boot 3
• Maven 3.6.+
• Java 17
• A GitHub repository
• Git
• Jenkins instance installed
• Docker installed
• Docker compose installed
• PostgreSQL
• Postman / insomnia or any other API testing tool (optional)

Spring boot application setup

Suppose we already have a simple Spring Boot Rest API that exposes book endpoints. The application is connected to the PostgreSQL database.

Project Structure

Here is our project structure:

book rest api

It works when trying to retrieve the list of books.

GET http://localhost:8080/api/book

Containerize application

1. Dockerfile

To build the container image with docker, we’ll need to use a file Dockerfile. A Dockerfile is simply a text-based file with no file extension that contains a script of instructions. Docker uses this script to build a container image. The file must be created at the root of the project.

# creates a layer from the openjdk:17-alpine…