# update-2.5.5

**Repository Path**: tom-cat/update-2.5.5

## Basic Information

- **Project Name**: update-2.5.5
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: main
- **Homepage**: None
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## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2026-02-03
- **Last Updated**: 2026-02-03

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## README

# Book Extra Chapters - U.2.5: Upgrade to Spring Boot 2.5.5, JDK 17

This repository contains the source code of the practical use case described in the book [Learn Microservices with Spring Boot (2nd Edition)](https://amzn.to/3nADn4q).

If you want to know more details about the book and its extra chapters, make sure to [visit this page](https://tpd.io/book-extra).

The book follows a pragmatic approach to building a Microservice Architecture, using a reference implementation that evolves from a small monolith to a full microservice system. 

## Upgrade - Spring Boot 2.5.5, JDK 17

This extra chapter brings the project dependencies to the latest Spring Boot and Java versions. 

All these changes are described in detail in a [blog post](https://thepracticaldeveloper.com/book-update-2.5.5/) at The Practical Developer's website. Visit [https://thepracticaldeveloper.com/book-update-2.5.5/](https://thepracticaldeveloper.com/book-update-2.5.5/)

### Changes - migrating from Spring Boot 2.4.0 to 2.5.5

A summary of the updates included in this package:

* [Multiplication]: Changed the logic of `ChallengeGeneratorService` to use the new JDK 17's `RandomGenerator` interface. This fixes a test but also uses good testing practices (Mock over Spy).
* [Gamification]: Removed the trick inside `application-default.properties` since that's not needed anymore and broke the build after the update.

The full description is [here](https://thepracticaldeveloper.com/book-update-2.5.5/).

#### References

* [The blog post](https://thepracticaldeveloper.com/book-update-2.5.5/).

Some additional references from the official documentation:

* [Spring Boot 2.5.5 Release Notes](https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.5-Release-Notes)

## Running the app

You can use Docker to start the complete system, and you can also run the services one by one on your computer. [See the book's last chapter repository](https://github.com/Book-Microservices-v2/chapter08d) for the detailed instructions.

I pushed the new images to the public registry, so you can get the system up and running with the new versions using Docker Compose:

```bash
docker$ docker-compose -f docker-compose-public.yml up
```

## Questions

* Do you have questions about how to make this application work?
* Did you get the book and have questions about any concept explained within this chapter?
* Have you found issues using updated dependencies?

Don't hesitate to create an issue in this repository and post your question/problem there. 

## About the book

Are you interested in building a microservice architecture from scratch? You'll face all the challenges of designing and implementing a distributed system one by one, and will be able to evaluate if it's the best choice for your project.

[Buy the book at Amazon](https://amzn.to/3nADn4q), or visit [https://tpd.io/book-extra](https://tpd.io/book-extra) for all the details.

### Purchase

You can **buy the book online** from these stores:

* [Amazon](https://amzn.to/3nADn4q)
* [Apress](https://www.kqzyfj.com/click-8535631-14029332?url=https%3A%2F%2Fwww.apress.com%2Fgp%2Fbook%2F9781484261309)
* and other online stores, check the IBAN (9781484261309) on [google](https://www.google.com/search?q=9781484261309)

### Source code by chapter (all repositories are available on Github)

* [Chapter 3. A professional 3-tier 3-layer Spring Boot app](https://github.com/Book-Microservices-v2/chapter03)
* [Chapter 4. Building a basic frontend in React (backender-friendly)](https://github.com/Book-Microservices-v2/chapter04)
* [Chapter 5. The Data Layer Concepts and Spring Data JPA](https://github.com/Book-Microservices-v2/chapter05)
* [Chapter 6. Starting with Microservices - Synchronous](https://github.com/Book-Microservices-v2/chapter06)
* [Chapter 7. Event-Driven Architectures - Making our system asynchronous](https://github.com/Book-Microservices-v2/chapter07)
* [Chapter 8 (I). The Gateway Pattern in Microservice Architectures (Spring Cloud Gateway)](https://github.com/Book-Microservices-v2/chapter08a)
* [Chapter 8 (II). Service Discovery and Load Balancing for Spring Boot Microservices (Consul / Spring Cloud Load Balancer)](https://github.com/Book-Microservices-v2/chapter08b)
* [Chapter 8 (III). Centralized Configuration with Consul KV](https://github.com/Book-Microservices-v2/chapter08c)
* [Chapter 8 (IV). Centralized Logs, Distributed Tracing, and Containerization with Docker (Buildpacks) and Docker Compose](https://github.com/Book-Microservices-v2/chapter08d)

Extra chapters:

* [E.1. End-to-End Microservice tests with Cucumber](https://github.com/Book-Microservices-v2/cucumber-tests)
* [U.2.4.0. Upgrade: Spring Boot 2.4.0 and more](https://thepracticaldeveloper.com/book-update-2.4.0/)
* [U.2.5.5. Upgrade: Spring Boot 2.5.5 and more](https://thepracticaldeveloper.com/book-update-2.5.5/)