Скачать или смотреть Resolving the ConflictingBeanDefinitionException in Spring Boot

Learn how to tackle the `ConflictingBeanDefinitionException` in Spring Boot applications caused by duplicate bean names without using string literals for annotations.
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This video is based on the question https://stackoverflow.com/q/68889793/ asked by the user 'Jordi' ( https://stackoverflow.com/u/3227319/ ) and on the answer https://stackoverflow.com/a/68895045/ provided by the user 'ray' ( https://stackoverflow.com/u/16709163/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the ConflictingBeanDefinitionException in Spring Boot

When developing Spring Boot applications, you might encounter a frustrating error: the ConflictingBeanDefinitionException. This usually occurs when two beans share the same name, leading to ambiguity during the application context initialization. In this guide, we will delve into a particular case where two service implementations—both named estatRegistreServiceImpl—are causing this conflict and how you can efficiently resolve it.

Understanding the Problem

You might have found yourself facing the following error during the start of your Spring Boot application:

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The Cause of the Conflict

In the case described, you have two service classes located in different packages:

cat.gencat.catsalut.hes.mpi.api.admin.service.EstatRegistreServiceImpl

cat.gencat.catsalut.hes.mpi.api.loader.service.EstatRegistreServiceImpl

Both of these classes are annotated with @ Service, leading Spring to automatically assign them the same bean name: estatRegistreServiceImpl. Since they are not interchangeable, this results in a conflict that prevents the application from starting properly.

Solution: Custom Bean Name Generation

To overcome this issue, you can create a custom bean name generator that appends the full package path to the bean name. This ensures that each bean has a unique identifier, thus preventing any name collisions.

Implementing a Custom Bean Name Generator

Define Your Main Application Class

Start by creating your main application class and implementing the ApplicationRunner interface for demonstration purposes:

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Create the Custom Generator Class

Within your main application class, define a static inner class that extends AnnotationBeanNameGenerator. In this class, override the generateBeanName method to customize how names are assigned:

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Run Your Application

Now, implement the run method of the ApplicationRunner interface to list out all the service beans, confirming that the bean names are unique:

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Conclusion

By creating a custom bean name generator, you can effectively resolve the ConflictingBeanDefinitionException in Spring Boot without resorting to string literals in your @ Service annotations. This solution not only helps in maintaining uniquely identifiable beans but also simplifies the management of your service classes.

If you find yourself dealing with similar bean naming issues, consider implementing a custom generator. It can save you time and avoid potential headaches during the life of your Spring Boot application.

Now that you have the tools to manage bean definitions effectively, you can focus on building more robust services without running into naming conflicts!