Скачать или смотреть How to Execute Specific Packages in Spring Boot Applications

Discover how to configure Spring Boot to selectively run services from designated packages, streamlining your application startup process.
---
This video is based on the question https://stackoverflow.com/q/67120836/ asked by the user 'Trayambak Kumar' ( https://stackoverflow.com/u/15351612/ ) and on the answer https://stackoverflow.com/a/67120922/ provided by the user 'sanjeevRm' ( https://stackoverflow.com/u/4856413/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Is there a way to execute only some packages in SpringBoot?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Execute Specific Packages in Spring Boot Applications

When working on a Spring Boot application, it’s common to have multiple services running within the same codebase. In some cases, this can lead to a situation where all services start up whenever you launch your application, even if you're only interested in running a specific subset of them. This can unnecessarily prolong startup time and affect overall performance. If you find yourself in this predicament, you might be wondering: Is there a way to execute only some packages in Spring Boot?

Fortunately, the answer is yes! There is a straightforward way to achieve this by using the @ ComponentScan annotation in your main application class. Below, we will explore how to utilize this annotation to only start specific packages in your Spring Boot application.

Solution Overview: Using @ ComponentScan

The @ ComponentScan annotation is a powerful feature in Spring that allows you to specify which packages to include in the component scan. By default, Spring Boot scans the package of the main application class and its sub-packages. However, you can customize this scan to include only specific packages.

Step-by-Step Guide to Implementing @ ComponentScan

Locate Your Main Application Class
Find your main application class, which is usually annotated with @ SpringBootApplication. This is typically where your main method resides.

Add the @ ComponentScan Annotation
You need to add the @ ComponentScan annotation above your main class definition. You can specify the specific package you want to scan by using the basePackages attribute.

Here's a simple example:

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

Replace with Your Package Name
In the basePackages attribute, replace com.example.yourpackage with the actual package you want to scan. This way, only the components inside this specified package will be picked up during application startup.

Run Your Application
Once you have made these changes, run your Spring Boot application as usual. You will notice that only the components in the specified package are initialized.

Benefits of Using @ ComponentScan

Efficiency: By limiting the scan to specific packages, your application starts faster.

Clarity: It makes it clear which services are active, aiding in maintaining your codebase.

Granular Control: Easily control which parts of your application should be loaded, allowing for simplified debugging and testing.

Conclusion

In summary, when you're in a scenario where you need to control which services start in your Spring Boot application, the @ ComponentScan annotation is your friend. By specifying the packages you wish to scan, you gain greater control over your application’s initialization process, leading to increased efficiency and clarity.

If you have a large number of services and only want to run a few of them, this approach will drastically improve your development workflow. Implement the @ ComponentScan annotation in your main application class and specify your desired packages to streamline your Spring Boot application’s startup process!

Feel free to drop any questions you have or share your experience with using @ ComponentScan in the comments below. Happy coding!