Making Asynchronous Calls in Java Spring Boot

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Spring Boot is a powerful framework for building web applications and services. In many cases, you may need to make asynchronous calls to improve performance and responsiveness. In this guide, we'll explore how to make asynchronous calls in Java Spring Boot using the @Async annotation and CompletableFuture class.

Using the @Async Annotation

In Spring Boot, you can use the @Async annotation to define methods that should run asynchronously. Here's how to use it:

Enable Asynchronous Processing: First, you need to enable asynchronous processing in your Spring Boot application by adding the @EnableAsync annotation to one of your configuration classes:

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Create an Asynchronous Method: Next, you can create a method with the @Async annotation in a Spring service class. This method will run asynchronously and return a CompletableFuture or void:

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In this example, the asyncMethod runs asynchronously and returns a CompletableFuture containing a string.

Use the Asynchronous Method: You can call the asynchronous method from other parts of your application. Since the method returns a CompletableFuture, you can chain additional actions using the thenApply or thenAccept methods:

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In this example, the AsyncClient class calls the asyncMethod asynchronously and handles the result once the task completes.

By using asynchronous methods in your Spring Boot application, you can improve performance and responsiveness, especially when dealing with time-consuming tasks such as external API calls, database queries, or file processing.