Send WhatsApp Messages in Java - Complete Guide

Automate WhatsApp messaging using Java and the WhatsMate WA Gateway REST API

Posted on February 17, 2016   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: January 28, 2026  

🚀 Automate WhatsApp Messaging with Java

Looking to integrate WhatsApp messaging into your Java applications? This guide walks you through sending WhatsApp messages using Java and the WhatsMate WA Gateway REST API. Perfect for Java developers building notification systems, customer engagement tools, or automated messaging solutions.

📋 Prerequisites

Before you begin, ensure you have:

  1. A WhatsMate WA Gateway account - Required for API access
  2. Recipient registration - Each recipient must register with the Gateway first
  3. Java Development Kit (JDK) - Version 8 or higher installed
  4. Basic Java knowledge - Familiarity with compiling and running Java programs

⚠️ Important: Recipients must register with the WhatsMate WA Gateway before they can receive messages. Unregistered users will not receive any messages from the Gateway. Registration instructions are available on the official WhatsMate site.

🎥 Video Walkthrough

📝 Step-by-Step Implementation

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

1. Copy the Java Template

Start by copying the following source code into a Java file named WhatsappSender.java:

2. Configure a few Parameters

Customize these key parameters in the Java code:

  • Line 9: Replace with your gateway instance ID
  • Lines 10-11: Update with your Client ID and Secret
  • Line 18: Specify the target phone number (including the country code, e.g., 12025550108)
  • Line 19: Provide your message content

3. Compile the Java Program

Compile the Java source file:

javac WhatsappSender.java

4. Send Your Message

Execute the compiled class to deliver your WhatsApp message:

java WhatsappSender

🔧 Common Use Cases

This Java integration approach is ideal for:

  • Enterprise applications - Send notifications from business systems
  • Customer support tools - Automate response and follow-up messages
  • Monitoring systems - Alert administrators about system events
  • E-commerce platforms - Send order confirmations and shipping updates

🚀 Get Started Today

Ready to integrate WhatsApp messaging into your Java applications? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending messages within minutes!

Next Steps: Once you’ve mastered basic message sending, explore advanced features like sending images, documents, or group messages through the WhatsMate API documentation.