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Developing Web Applications

with Play & Scala

This book is 5% completeLast updated on 2025-09-18
Paul E. Sevinç

I am not going to teach Play or Scala to you. Alas, I have read too many books whose authors have bitten off more than they could chew by trying to explain anything & everything themselves. The parts which go to make Play are concisely and well explained in the official, freely accessible docs; there is no point in me reinventing the wheel. Instead, this book is a guided tour through the Play docs and my intention is to show how to apply what you have learned by reading them to two production-level, albeit simple, Web apps.

In doing so, my aim is to help you progress from programming to software development sprinkled

with some software engineering.

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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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