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WhatsApp API with Java

This guide provides everything you need to send messages, build bots, and automate communication using the WhatsApp API Java (also known as Java WhatsApp API). We'll provide production-ready code examples and best practices using SendZen.io to ensure a world-class developer experience.
Whether you want to write a simple Java application to send WhatsApp message Java or build a sophisticated AI chatbot using the WhatsApp bot API Java, you're in the right place. Unofficial libraries that rely on web scraping are unreliable and will get your number banned. Using the official WhatsApp Business API Java is the only stable and scalable method for professional applications.
SendZen makes the WhatsApp API integration Java incredibly simple. This guide covers everything from basic messaging to building complete WhatsApp bots and WhatsApp API integration in Java. Let's dive in.
This guide covers:
Send WhatsApp message Java - Complete API integration examples.
Receiving messages using a Spring Boot webhook.
Building a complete, interactive WhatsApp bot.
WhatsApp API Java GitHub - Production-ready code examples.
Best practices for production, including WhatsApp business API integration Java.

Prerequisites#

Before you start, you'll need:
1.
Java 11+ installed.
2.
A free SendZen.io Account to get your API Key.
3.
Maven or Gradle for dependency management.
4.
For the webhook examples, we'll use Spring Boot. Add these dependencies to your pom.xml:
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>3.1.0</version>
    </dependency>
</dependencies>
Or for Gradle (build.gradle):

Part 1: How to Send a WhatsApp Message with Java#

Sending a transactional message programmatically, like an order confirmation or a 2FA code, is a core use case. This guide shows you how to send WhatsApp message programmatically Java using the official WhatsApp API Java. This Java code uses the built-in HttpClient (available in Java 11+) to make a simple API call. This demonstrates WhatsApp API integration Java best practices.
Create a file named SendMessage.java and add the following code.
Alternative using JSON library (recommended):
For better JSON handling, use a library like Jackson or Gson. Here's an example with Jackson:
To add Jackson dependency (Maven):
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.15.2</version>
</dependency>
To run this:
1.
Replace YOUR_API_TOKEN and RECIPIENT_NUMBER with your details.
2.
Compile and run: javac SendMessage.java && java SendMessage (or use your IDE).
You've just successfully sent an automated WhatsApp message using Java! This simple function demonstrates how to send WhatsApp message Java and is the foundation for all outbound messaging using the WhatsApp API Java. This Java code to send WhatsApp message can be easily integrated into your Java application.

Part 2: Receiving Messages with a Java Webhook#

To build a WhatsApp bot, your application needs to listen for incoming messages. The WhatsApp API Java does this using webhooks. When a user messages your number, WhatsApp sends the message data as a JSON POST request to a URL you specify.
We'll use Spring Boot, the most popular Java web framework, to create a simple webhook server. This demonstrates WhatsApp API integration Java and how to receive messages using WhatsApp API integration in Java.
Create a Spring Boot application with the following structure:
1. Main Application Class (Application.java):
2. Webhook Controller (WhatsAppWebhookController.java):
3. Application Properties (application.properties):
To make this work:
1.
Run the Spring Boot App: Run your Application class. Your server is now running on localhost:5000.
2.
Expose to the Web: WhatsApp can't reach localhost. Use a tool like ngrok to create a public URL for your local server:
3.
Configure the Webhook: Copy the https://....ngrok.io URL provided by ngrok, append your route (/webhooks/whatsapp), and paste it into the Webhook URL field in your SendZen dashboard.
Now, when you send a message to your WhatsApp number, you'll see the message data printed in your console.

Part 3: Building a Complete WhatsApp Bot in Java#

Let's combine what we've learned to create a simple but complete WhatsApp bot. This bot will reply to specific keywords, demonstrating a full WhatsApp bot API Java implementation.
We'll modify our Spring Boot application to include the sendWhatsAppMessage function. This example shows how to build a WhatsApp bot from scratch using WhatsApp API integration Java.
Add to application.properties:
Run this updated Spring Boot application with ngrok again. Now, when you send "hello" or "status" to your WhatsApp number, the bot will reply automatically! This is the foundation for all WhatsApp automation with Java and demonstrates how to send WhatsApp message using Java programmatically.
You can find more examples and contribute to this codebase on WhatsApp API Java GitHub repositories. This implementation uses the WhatsApp Business API Java for reliable messaging and shows WhatsApp API integration in Java best practices.

Advanced Topics & Best Practices#

Scaling Up: Java WhatsApp Bulk Sender#

To send bulk messages programmatically, such as alerts to all your users, simply loop through a list of recipient numbers and call the sendWhatsAppMessage function for each. For large volumes, consider using a thread pool or async processing. This demonstrates how to send WhatsApp message programmatically Java at scale using WhatsApp API integration Java.
Important: To initiate conversations with users, WhatsApp requires you to use pre-approved Message Templates. This is a crucial policy to prevent spam. You can easily manage and send templates via the SendZen API. For bulk campaigns, use templates.

Spring Boot WhatsApp API Integration#

For a more robust Spring Boot implementation, create a service class to separate concerns. This demonstrates WhatsApp API integration Java with Spring Boot and shows WhatsApp business API integration Java best practices:
1. Create a Service Class (WhatsAppService.java):
2. Update Controller to Use Service:

Using REST Template (Alternative)#

If you prefer Spring's RestTemplate or WebClient instead of HttpClient:

Additional Resources#

WhatsApp API Java GitHub Examples#

Looking for more examples? Check out WhatsApp API Java GitHub repositories for additional code samples, integrations, and community contributions. Our implementation demonstrates how to use the WhatsApp Business API Java effectively.

Key Features Covered#

✅ Send WhatsApp message Java - Complete API integration
✅ WhatsApp API send message Java - Production-ready code
✅ Java send WhatsApp message - Simple and reliable
✅ WhatsApp bot API Java - Full bot implementation
✅ WhatsApp Business API Java - Enterprise-ready solution
✅ WhatsApp API integration Java - Best practices included
✅ WhatsApp API integration in Java - Framework integrations

Common Questions#

Q: How do I send WhatsApp message using Java?
A: Use the sendWhatsAppMessage function provided in Part 1. It uses Java's HttpClient to send messages via the WhatsApp API Java.
Q: How to integrate WhatsApp API in Java?
A: Follow Part 1 to integrate WhatsApp API in Java. The code examples demonstrate WhatsApp API integration in Java best practices.
Q: How do I send WhatsApp message Java?
A: Use the sendWhatsAppMessage method to send WhatsApp message Java. See Part 1 for complete examples.
Q: Can I send WhatsApp message from Java application?
A: Yes, you can send WhatsApp message from Java application using the code examples in Part 1. For development, you can send WhatsApp message from Java application free.
Q: How to send WhatsApp message programmatically Java?
A: Use the code examples in Part 1 to send WhatsApp message programmatically Java. The function uses HttpClient to make HTTP requests to the WhatsApp API Java.
Q: How do I send WhatsApp message using Java?
A: Use the sendWhatsAppMessage function in Part 1 to send WhatsApp message using Java. It handles all API communication for you.
Q: Is there WhatsApp API Java example code?
A: Yes, this entire guide provides WhatsApp API Java example code that you can use directly in your Java projects.
Q: How to send WhatsApp message from Java?
A: Use the examples in Part 1 to send WhatsApp message from Java. The code shows how to send message on WhatsApp using Java.
Q: What's the difference between WhatsApp Business API Java and WhatsApp API for Java?
A: Both refer to the official WhatsApp Business API Java. The WhatsApp API for Java is another way to refer to the same API.
Q: How to send message WhatsApp Java?
A: Use the sendWhatsAppMessage function to send message WhatsApp Java. See Part 1 for complete examples.
Q: Can I use Java API to send WhatsApp message?
A: Yes, use the Java API to send WhatsApp message examples provided in Part 1. They show complete Java code to send WhatsApp message implementations.
Q: How do I send message to WhatsApp using Java?
A: Use the sendWhatsAppMessage function in Part 1 to send message to WhatsApp using Java. It demonstrates Java send message to WhatsApp best practices.
Q: Is there WhatsApp API Java free?
A: Yes, you can use the WhatsApp API Java free tier during development. For production, use the official WhatsApp Business API Java.
Q: How to send WhatsApp message Java API?
A: Use the sendWhatsAppMessage function to send WhatsApp message Java API. It handles all the API communication for you.
Q: Can I send WhatsApp message from Java application free?
A: Yes, you can send WhatsApp message from Java application free during development. The WhatsApp API Java free tier allows testing before production deployment.
Q: How do I send WhatsApp message using Java application?
A: Use the code examples in Part 1 to send WhatsApp message using Java application. They demonstrate send WhatsApp message from Java application implementations.
Q: Is there WhatsApp API Java GitHub repository?
A: Yes, check out WhatsApp API Java GitHub repositories for community examples and contributions.
Q: How to use WhatsApp Business API for Java?
A: Follow this guide to use the WhatsApp Business API for Java. All examples demonstrate WhatsApp business API integration Java best practices.
Q: What's WhatsApp integration API Java?
A: The WhatsApp integration API Java refers to integrating WhatsApp messaging capabilities into Java applications, as demonstrated in this guide.
Q: How to send message whatsapp java?
A: Use the sendWhatsAppMessage function to send message whatsapp java. See Part 1 for complete examples.
Q: Can I use Java send message whatsapp?
A: Yes, use the Java send message whatsapp examples in Part 1. They show Java send message whatsapp implementations.
Q: How do I send whatsapp message java?
A: Use the sendWhatsAppMessage function to send whatsapp message java. See Part 1 for complete examples.
Q: How to use WhatsApp API in Java?
A: Follow Part 1 to use the WhatsApp API in Java. The guide covers WhatsApp API integration in Java step by step.

Start Building Now#

You now have a complete toolkit for WhatsApp API programming in Java. By combining a simple function to send WhatsApp message using Java and a Spring Boot webhook to receive them, you can build powerful, automated communication workflows.
Whether you're building a WhatsApp bot, integrating the WhatsApp API Java into your application, setting up WhatsApp API integration Java, or creating a Java send WhatsApp message system, SendZen makes it simple.
With SendZen's developer-first WhatsApp API Java solution, you can stop wrestling with complex setups and focus on creating amazing applications. Use this guide to integrate WhatsApp API in Java, send WhatsApp message programmatically Java, and build robust WhatsApp API integration Java solutions.
Sign Up for Free & Get Your API Key →
Modified at 2025-11-04 09:11:54
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