How to run a local version of the application with the ability to switch between different user profiles?

To run a local version of a Java application with the ability to switch between different user profiles, a profiles mechanism is usually used, for example, in Spring Boot.

In Spring Boot, profiles allow defining different configurations for different environments or users. To do this:

1. Create several configuration files, such as application-dev.properties, application-test.properties, application-prod.properties, with different settings.
2. When starting the application, specify the active profile via the parameter -Dspring.profiles.active=dev or in application.properties.
3. In the code, you can use the @Profile annotation for beans that should only be loaded for a specific profile.

Example of starting with a profile:

java -jar myapp.jar --spring.profiles.active=dev

If it is about switching between user profiles within the application, you can implement a profile selection mechanism through UI or launch parameters, loading the appropriate settings or context.

Thus, profiles allow flexible configuration management and running the application with different parameters for different users or environments.