Five-Project Series

Open Banking App Using OpenAPIs and Spring Boot you own this product

intermediate Java • beginner Spring Boot • beginner build tools
skills learned
create a REST controller with Spring Web • integrating with OpenAPI • securing an application with Spring Security • bundle your related services using Docker Compose
Nathan Crocker
5 weeks · 5-7 hours per week average · INTERMEDIATE
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includes 5 liveProjects
liveProject $49.99 $69.99 self-paced learning

In this series of liveProjects, you’ll take on the role of backend engineer working for a boutique FinTech company. Your boss wants you to build an app that will give personal financial customers a better idea of how they’re spending their money, with an in-depth summary of every transaction. You’ve decided to use Spring Boot and OpenAPI to build this banking app. In each liveProject in this series, you’ll construct a new essential component of the FinTech app, including security integration, caching, and UI.

These projects are designed for learning purposes and are not complete, production-ready applications or solutions.

Manning author Nathan Crocker shares what he likes about the Manning liveProject platform.

here's what's included

Project 1 Define the Contract
In this liveProject, you’ll use Spring Boot and Gradle to create the basic mobile banking application. You’ll begin by creating the domain object, REST Controller, and supporting service to present the data, then test your application to ensure it’s working properly. You’ll add JPA to store your users’ transactions, then finish up with end-to-end testing of your whole app.
Project 2 Adapt to the Standard
In this liveProject, you’ll build an API that can integrate your customer’s transaction data from a third party. You’ll construct a robust client with OpenAPI and WebClient, and make HTTP requests with Spring Boot. You’ll then develop a pipeline of enrichment for the merchant data you acquire through your API.
Project 3 Secure Endpoints
In this liveProject, you’ll secure a financial application using the out-of-the-box security features of Spring. You’ll set up authentication servers, add users, and configure rules for your application.
Project 4 Exchange Data Securely
In this liveProject, you’ll secure a financial application using the out-of-the-box security features of Spring. You’ll set up authentication servers, add users, and configure rules for your application.
Project 5 Production
In this liveProject, you’ll ready your service for production. You’ll use the Spring caching API to add caching functionalities to a financial application, and compose your application for deployment. You’ll use Redis as your caching server.

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project author

Nathan Crocker

Nathan B Crocker is a Senior Java Developer at Galaxy Digital LP., one of the premier financial services and investment management companies in the digital asset and cryptocurrency sector. He is focused on building and augmenting front and middle office systems to grow trading operations and scale the business. For over a decade, he has built dozens of financial services applications, using Spring Boot to build traditional services, microservices, and event-driven systems for several FinTech companies, as well as large investment banks.


The liveProject is for intermediate Java programmers who know the basics of Spring Boot and REST services. This project will use the last stable version of Java 14. To begin this liveProject, you will need to be familiar with the following:

  • Intermediate Java
  • Beginner Spring Boot
  • Beginner build tools

you will learn

In this liveProject, you’ll master the technology stack used for professional Java development. You’ll learn the ins and outs of integration, one of the most common tasks in software development.

  • Basics of Spring Boot
  • Create a REST Controller with Spring Web
  • JPA to persist state to a database
  • Using RestAssured to perform integration tests on Spring Applications
  • Use Testcontainers to perform tests on your JPA code


You choose the schedule and decide how much time to invest as you build your project.
Project roadmap
Each project is divided into several achievable steps.
Get Help
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Compare with others
For each step, compare your deliverable to the solutions by the author and other participants.
book resources
Get full access to select books for 90 days. Permanent access to excerpts from Manning products are also included, as well as references to other resources.