Send WhatsApp Group Messages in Java - Complete Guide

Automate WhatsApp group messaging using the WhatsMate WA Gateway REST API

Posted on April 10, 2017   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: February 13, 2026  

Automate WhatsApp Group Messaging with Java

Looking to integrate WhatsApp group messaging into your Java applications? This guide walks you through sending WhatsApp group messages using Java and the WhatsMate WA Gateway REST API. Perfect for Java developers building enterprise applications, backend services, or any Java-based system that needs WhatsApp group notifications.

đź“‹ Prerequisites

Before you begin, ensure you have:

  1. A WhatsMate WA Gateway Forever Green account - Required for group messaging API access
  2. Group setup - Create a WhatsApp group with a unique name and add the gateway
  3. Java Development Kit (JDK) - Version 8 or higher installed
  4. Basic Java knowledge - Familiarity with Java programming and compilation

⚠️ Important: You need a Forever Green account to send messages to WhatsApp groups. The gateway must be added to your WhatsApp group before it can send messages. Sign up for a Forever Green account to enable group messaging capabilities.

đź“ť Step-by-Step Implementation

Follow these steps to send your first WhatsApp group message from a Java application:

1. Prepare Your WhatsApp Group

Before coding, set up your WhatsApp group:

  1. Create a new group in WhatsApp with a unique name (the API won’t work if the name isn’t unique)
  2. Add the secret gateway number to the group
  3. Send a “Hi” message (or any message) in the group from your personal WhatsApp account - this helps the gateway silently recognize the new group in the background

2. Copy the Java Template

Copy the following source code to a Java file named WhatsappSender.java:

3. Configure Key Parameters

Customize these essential parameters in the Java program:

  • Line 9: Replace YOUR_INSTANCE_ID_HERE with your WhatsApp gateway instance ID
  • Lines 10-11: Update YOUR_CLIENT_ID_HERE and YOUR_CLIENT_SECRET_HERE with your Forever Green Client ID and Secret
  • Line 18: Specify the group admin’s phone number (including country code, e.g., 12025550108)
  • Line 19: Provide your group name (must be unique)
  • Line 20: Enter your message content

4. Compile and Run

  1. Compile the Java file: javac WhatsappSender.java
  2. Execute the class to send your message: java WhatsappSender

🔧 Common Use Cases

This Java integration is ideal for:

  • Enterprise notifications - Send automated alerts to business teams or departments
  • Application monitoring - Get WhatsApp alerts for application errors or performance issues
  • Scheduled business updates - Automate daily/weekly business reports to management groups
  • Backend service integration - Integrate WhatsApp notifications into existing Java backend systems

🚀 Get Started Today

Ready to integrate WhatsApp group messaging into your Java applications? You’ll need a Forever Green account to access the group messaging API. Sign up for a Forever Green account and start sending group messages within minutes!

Next Steps: Once you’ve mastered basic group text messaging, explore advanced features like sending images or documents to WhatsApp groups through the WhatsMate WA Gateway API documentation.