Hello it's Othman Moussawel, please find below the source code of the project in which you can call jsonplaceholder API within your JAVA springboot application. I have set the server port to '8084' but you can change it from : "src/main/resources/application.properties". I made two packages, one that contains the AlbumApiApp that starts the app, and a DataController. The other package is the one that contanis the models ( the class for users,albums.. ).

-To call the getAllUsers Method : http://localhost:8084/Users
-To call the getAllAlbumss Method : http://localhost:8084/Albums
-To call the getAlbumsOfUsers Method : http://localhost:8084/UserAlbum/1 you can put any id for now i put 1 (http://localhost:8084/UserAlbum/id). I attached a Pictures folder in which I screenshoted the call of the API of https://jsonplaceholder.typicode.com from chrome and pictures from Postman that calls my API. The image that ends with .(1) is the result of the call of https://jsonplaceholder.typicode.com API from the browser whereas the image that ends with .(2) is the result of the call of my API in postman. The reason I did screenshots of the browser and postman in order for you to differentiate between them. I used Spring tool suite IDE to develop the application. Thanks.