spring-reactive-chat

Chat application built with Spring WebFlux

Requirements

Java 17
MongoDB 3.6+

Getting Started

Building from Source

This project uses Gradle Wrapper and the Gradle Kotlin DSL.

To build the project use:

gradlew clean build

Running the Application

To run the application you can use one of the tasks provided by the Spring Boot Gradle Plugin:

gradlew bootRun

Additionally, you can also set specific application profiles, e.g. for dev use:

gradlew bootRun --args='--spring.profiles.active=dev'

Using MongoDB

The project makes use of MongoDB Change Streams to stream new chats and chat messages via Server-Sent Events (SSE) endpoints based on the text/event-stream media type.

Change Stream support is only possible for replica sets or for a sharded cluster.

— Spring Data MongoDB Reference Documentation

Running a standalone MongoDB instance and calling the aforementioned endpoint will result in an exception:

com.mongodb.MongoCommandException: Command failed with error 40573 (Location40573): 'The $changeStream stage is only supported on replica sets' on server localhost:27017.

Please refer to this tutorial to deploy a replica set.