Cobalt, formerly known as CobaltWhatsapp4j, is a powerful library designed for developers looking to interact with WhatsApp through its APIs, both for WhatsApp Web and Mobile. In this blog, we will walk you through installing and using Cobalt, along with tips for troubleshooting any issues you may encounter along the way!

What is Cobalt?

Cobalt is a library built specifically to interact with WhatsApp. It can be utilized for the following:

• WhatsApp Web (Companion)
• WhatsApp Mobile (Personal and Business)

Getting Started: Installation

Before diving into coding, you need to install Cobalt. This can be done via Maven or Gradle.

Maven – Dependency

<dependency>
    <groupId>com.github.auties00</groupId>
    <artifactId>cobalt</artifactId>
    <version>0.0.7</version>
</dependency>


<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <annotationProcessorPaths>
            <annotationProcessorPath>
                <groupId>com.github.auties00</groupId>
                <artifactId>cobalt</artifactId>
                <version>0.0.7</version>
            </annotationProcessorPath>
        </annotationProcessorPaths>
    </configuration>
</plugin>

Gradle – Groovy DSL

implementation 'com.github.auties00:cobalt:0.0.7'

// Annotation processor (required for @RegisterListener)
annotationProcessor 'com.github.auties00:cobalt:0.0.7'

Creating a Connection

To create a new connection, you can start building with:

Whatsapp.webBuilder()
    .newConnection(someUuid)
    .connect();

Think of it like preparing a coffee; you set everything up with your preferred coffee machine, start the brewing process, and wait for that perfect cup to enjoy!

Working with Listeners

Listeners are crucial for handling events in Cobalt. You can implement them to manage various application activities. Here’s a brief example using a simple listener:

public class MyListener implements Listener {
    @Override
    public void onLoggedIn() {
        System.out.println("Hello :)");
    }
}
api.addListener(new MyListener());

It’s like having a friend in the room alerting you whenever someone arrives!

How to Send Messages

Sending a message is quite straightforward. Here’s an example:

var chat = api.store().findChatByName("My Awesome Friend")
    .orElseThrow(() - new NoSuchElementException("Hey, you don't exist"));

api.sendMessage(chat, "This is a text message!");

Troubleshooting

If you encounter issues using Cobalt, consider the following troubleshooting steps:

• Ensure your Java version is compatible (Java 21 is recommended).
• Double-check your dependencies in Maven or Gradle.
• If your machine has memory constraints, optimize JVM with the -Xmx argument.
• For connection issues, confirm your QR or pairing code functionality.

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Conclusion

Cobalt is an exciting tool for interacting with WhatsApp. With the help of provided examples and the troubleshooting steps, you are now equipped to embark on your journey with this library!

At fxis.ai, we believe that such advancements are crucial for the future of AI, as they enable more comprehensive and effective solutions. Our team is continually exploring new methodologies to push the envelope in artificial intelligence, ensuring that our clients benefit from the latest technological innovations.