What scope of bins have you used in your projects?

In Java projects using the Spring Framework, I most often used the following bean scopes:

• Singleton — the bean is created once for the entire application context. This is the default scope. It is used for services, repositories, and other components that should be shared.

• Prototype — each request for a bean creates a new instance. Useful when a new object with a unique state is needed for each use.

• Request — the bean lives for the duration of a single HTTP request (in web applications). It is used to store data specific to the current request.

• Session — the bean exists for the duration of a user session. It is used to store user data between requests.

• Application — the bean lives at the level of the entire web application, shared across all sessions and requests.

Depending on the task, the appropriate scope is chosen for optimal management of the lifecycle and resources.