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Spring WebFlux explained with a simple CRUD example
Shardul Lavekar
August 11, 2023

Introduction to Spring WebFlux

Spring WebFlux is a reactive programming framework that's part of the Spring ecosystem. It's designed to handle asynchronous and non-blocking operations, making it suitable for building highly scalable and performant applications. WebFlux supports both reactive streams and traditional servlet-based programming models.

In a traditional Spring MVC application, requests are handled by blocking threads. With WebFlux, requests are processed asynchronously using reactive programming principles, which means that threads are not blocked while waiting for I/O operations to complete. This leads to better resource utilization and improved application responsiveness.

CRUD Example with Spring WebFlux

Let's walk through a simple CRUD example using Spring WebFlux. We'll create a basic RESTful API for managing a list of tasks. We'll perform the following operations:

1. Create a new task.

2. Retrieve a list of all tasks.

3. Retrieve a specific task by ID.

4. Update a task.

5. Delete a task.

1. Project Setup

First, make sure you have Spring Boot and Spring WebFlux dependencies added to your project. You can do this by adding the following to your `pom.xml` (if you're using Maven) or `build.gradle` (if you're using Gradle):

2. Create the Task Model

Note that we use @Data annotation above from Lombok that generates getters and setters for above class Task.

3. Create the Controller

4. Testing the methods with Unlogged

Install Unlogged from InteliiJ’s marketplace so that you can quickly test the controller methods quickly.

1. Create a new task:

2. Get a list of all tasks:

3. Get a specific task by ID:

4. Update a task:

5. Delete a task:

Spring WebFlux provides a powerful and efficient way to build reactive APIs for your applications. In this CRUD example, we demonstrated how to create a simple RESTful API for managing tasks. By leveraging reactive programming principles, you can create applications that are responsive and scalable, even under heavy loads.

Shardul Lavekar
August 11, 2023
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