1. Configure Spring MVC and DB(in db.properties file). Adding Spring dependencies use the same version for each of them. For this purpose you can use property spring.version.
2. Create UserResponseDto with all fields of User in dto package. Also, you should add default constructor explicitly if you'll decide to create new ones.
3. Create UserController in controller package where you should

   • implement method GET: /users/inject which will create test data. Let's create three users in this method and save them to DB:

     firstName	lastName
     John	Doe
     Emily	Stone
     Hugh	Dane

   • method UserResponseDto get(Long userId), URL: GET: /users/{userId} . This method should return information about user by user id.

   • method List<UserResponseDto> getAll, URL: GET: /users. This method should return information about all users from DB.

In response let's return the message Users are injected!

4. Create a UserMapper in service package, where we're gonna perform all mapping to/from DTOs in order to stick with SRP. Use will use this mapper on the controller layer.

5. Run tests with command mvn -DskipTests=false clean package.

You can check yourself using this checklist