Скачать или смотреть Fixing the No auto configuration classes found in META-INF/spring.factories Error in Spring Boot

Struggling with the "No auto configuration classes found" error while running your Spring Boot application? Discover the steps to resolve this issue effectively!
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This video is based on the question https://stackoverflow.com/q/63661877/ asked by the user 'Maya Oxenhandler' ( https://stackoverflow.com/u/10777369/ ) and on the answer https://stackoverflow.com/a/63663807/ provided by the user 'Qiu Zhou' ( https://stackoverflow.com/u/7994967/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Spring Boot: Resolving the No auto configuration classes found in META-INF/spring.factories Error

If you’re navigating the world of Spring Boot development, you might have encountered the frustrating error:
“No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.” This error typically signifies an issue during the application startup process, specifically when auto-configuration classes aren't being recognized due to issues in your setup.

Understanding the Error

This error usually surfaces in two common situations:

The Spring Boot application is unable to locate necessary configuration files for auto-configuration, namely spring.factories.

There could be issues with how your project is being packaged or the dependencies are being handled in your pom.xml file (for Maven projects).

As a result, your application may fail to start, displaying a barrage of debugging information along with the error message.

Steps to Resolve the Error

To troubleshoot and fix the issue effectively, follow these steps:

Step 1: Verify Your Dependencies

First and foremost, ensure that all necessary dependencies for your application are correctly downloaded and included in your project. Check for any inconsistencies in your pom.xml file. Here's a simplified checklist:

Ensure that you have included the correct Spring Boot Parent dependency to manage versions:

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Confirm that you have included all required Spring Boot starter dependencies for the functionalities you need, like spring-boot-starter-data-mongodb, spring-boot-starter-web, etc.

Step 2: Clean and Package Your Application

After verifying the dependencies, the next step is to package your application properly. To do this, using the command line, run the following commands:

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Explanation of Commands:

mvn clean removes the target directory generated by previous builds, ensuring you start fresh.

mvn package compiles your application and creates the final JAR (Java ARchive) file to be run.

Step 3: Look for the META-INF/spring.factories File

If the problem persists, you may need to inspect whether the META-INF/spring.factories file exists within your packaged application. This file is crucial as it contains configurations for auto-configuration classes. You can typically find it under:

[[See Video to Reveal this Text or Code Snippet]]

If this file is missing, it may indicate an issue with how your project has been structured or packaged. Make sure that no custom configurations are unintentionally excluding this file during the packaging process.

Final Thoughts

Resolving the No auto configuration classes found in META-INF/spring.factories error can seem daunting, but by carefully examining your dependencies and packaging your application correctly, you'll be able to fix the issue. Remember that keeping your dependencies organized and maintaining a clean build environment plays a crucial role in successful Spring Boot development.

With this guide, you should now have the tools necessary to tackle the issue and get your application running smoothly. Happy coding!