I have this following configuration class where I generate all of my beans, everything worked perfectly until I needed a second instance of a same bean:

I’m new to Spring and currently learning it through some paid courses. I came across the concept of loose coupling, and I understand that Spring promotes defining behavior in interfaces. However, I am wondering why it’s necessary to define behavior in an interface instead of directly extending the implementation in a class?

getBean(Class requiredtype) means what parameter are need to be write in this method?

I’m developing an API using Java Spring. It has a controller, a service and a repository, in the repository I deserialize a JSON file and populate a list. I want to create unit tests for the repository. How do I mock this list, so I don’t change it during testing? I’m having doubts regarding the concept of unit tests, should this list be mocked or can I use the list that is used in the repository?

I got an Interface with only one method that has default implementation

I got an Interface with only one method that has default implementation

What I did:

What I did:

My code gives this error when starting in the Console:

My code gives this error when starting in the Console: