Build a MatterMost Weather Bot with Java: A Practical guide

Learn how to create a functional bot that delivers daily weather updates with dynamic icons, and scheduled notifications

Introduction

Weather info in your team chat can help with office planning and casual chats. This article will build a simple, practical MatterMost bot. It will post daily weather updates using Java, Spring Boot, and weather API.

What we will build

Spring Boot application that:

• Connects to MatterMost via webhooks.
• Fetches weather data from OpenWeatherMap API.
• Posts daily weather updates at 9:00 AM.

Prerequisites

• Java 17
• Maven or Gradle
• Docker

Implementation

Let’s start bot development using the MatterMost server on our local environment. Create a docker-compose file with the following content.

version: '3'
services:
  postgres:
    image: postgres:14-alpine
    container_name: mattermost-postgres
    environment:
      - POSTGRES_USER=mmuser
      - POSTGRES_PASSWORD=mmuser_password
      - POSTGRES_DB=mattermost
    volumes:
      - mattermost-postgres:/var/lib/postgresql/data
    networks:
      - mattermost-network

  mattermost:
    image…