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Developing Web Applications

with Play & Scala

Paul E. Sevinç

This book shows how to develop Web applications with Play 3 & Scala 3 and with the Ports & Adapters pattern as well as DDD's tactical patterns (making your modulith or microservice not only maintainable, but also allowing for further adopting the Clean Architecture or the Onion Architecture).

The teaching aid (https://fixadat.com/) that we are going to dissect shows how to implement a Web application’s API with Play & Scala and its GUI with React & TypeScript, the focus being on the former and not the latter.

In order to also show how to implement a GUI without React (or one of its alternatives), a small part of the GUI has been reimplemented twice, once with Play’s Twirl in combination with htmx and once with Twirl only.

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Computers and ProgrammingScalaKotlinJava

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Author

About the Author

Paul E. Sevinç

After having gained industry and academic experience in Austin, Lausanne, and Zurich, Dr. Paul E. Sevinç is now the CTO of Squeng AG. He is the co-founder and former CTO of Doodle AG as well as a co-initiator of Elohna GmbH and Ledgy AG. He still enjoys developing software.

Contents

Table of Contents

Cover-Picture Sources

Preface

  1. MVP

Prerequisites

  1. Tools of the Trade

Teaching Aid

  1. Schedule like it’s 200X
  2. Getting Started: Hello, Play!

Project Layout

  1. Outwith: Überproject
  2. Within: So Long, Layered MVC!
  3. Monolith, Modulith, and Microservices

New …

  1. … Repository
  2. … Application

Dependency Injection

  1. Controllers and Filters

Two Become One 1

  1. Dude, where’s my API?
  2. Prepare for Launch

GUI Libraries

  1. Bootstrap
  2. React Router
  3. Getting htmx and Bootstrap as well as Bootstrap Icons

Security as a Forethought

  1. Hardening the backend
  2. Testing
  3. Hardening the frontend
  4. What about TLS?
  5. Rinse & Repeat

Database Management System

  1. MongoDB
  2. Event Store
  3. Event Sourcing
  4. MongoDB

Internationalization and Localization

  1. Both Fixadat and SVPofWFTTC
  2. Only Fixadat: Backend
  3. Only Fixadat: Frontend
  4. CI/CD

Two Become One 2

  1. Alternatives
  2. Building Images Locally
  3. Running Containers Locally

Continuous Integration

  1. Test
  2. Scan

Continuous Delivery

  1. Pull
  2. Push

Continuous Deployment

  1. MongoDB
  2. Docker or Java
  3. Features

Going Public

  1. index.html
  2. Records and Case Classes
  3. Primitive Types

Interaction Design

  1. Users and Interactions
  2. Boilerplate

Configuration

  1. Configuration Files
  2. Application Secret
  3. Session Cookie
  4. Logging

Template

  1. Boilerplate

Privacy

Legalese

  1. Appendix

Updating and Upgrading

  1. Updating the Backend
  2. Updating the Frontend
  3. Upgrading the Backend
  4. Upgrading the Frontend

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