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Learn how to successfully migrate from Spring Boot 2 to Spring Boot 3 and solve the configuration issues with Spring Cloud AWS S3 auto configuration.
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Migrating to Spring Boot 3 with Spring Cloud AWS: How to Configure S3 Automatically

As developers transition to newer versions of Spring Boot, several challenges might arise, particularly when working with cloud services like AWS. One such problem is ensuring that automatic configuration for AWS S3 continues to work smoothly. In this guide, we’ll explore how to migrate from Spring Boot 2.7.9 to Spring Boot 3.0.2 while successfully configuring AWS S3.

Understanding the Initial Setup

Spring Boot 2.7.9 Configuration

In the original setup using Spring Boot 2.7.9, your pom.xml file will look something like this:

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In addition, you'd include dependencies for Spring Cloud AWS as follows:

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You would also set AWS properties in your application properties file:

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With this configuration, the server boots without issues.

Transition to Spring Boot 3.0.2

However, when transitioning to Spring Boot 3.0.2, here’s what your pom.xml needs to reflect:

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You will also need to update your dependencies:

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Encountering Issues

After making these changes, you may encounter an error when the server starts. The key error message reads:

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This indicates that the application is unable to automatically configure an instance of the AmazonS3 client, which is critical for interacting with S3.

The Solution: Manual Bean Creation

The solution to this problem involves manually defining the AmazonS3 bean in your configuration. Here's how you can do it:

Step-by-Step Implementation

Create a Configuration Class
Create a configuration class where you will define your S3 client bean.

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Effectively Use the Bean
With this bean configured, you can now inject AmazonS3 wherever you need it within your application. This manual configuration ensures that your application will correctly interact with AWS S3.

Conclusion

Migrating to Spring Boot 3 along with Spring Cloud AWS may introduce some challenges regarding automatic configuration. However, by manually defining the necessary beans in your configuration class, you can overcome these obstacles and ensure your application runs smoothly. Embrace the new versioning while recognizing the need for slight adjustments in your configuration practices.

Feel free to share your thoughts or experiences in the comments below, or ask any questions you might have about migrating to newer versions of Spring Boot!