PR attached with a refactored backend app (residing in 'Keycloak' folder) that includes the functionality of ProductInventory demo plus multipart upload logic. Further we included a web app (deployed as '/products) to allow browsing of the files uploaded.

Note that opted to include both the web app and the backend in one war for easier getting started. Further, we imagine the app to further enhance in the future with further REST services and web apps each residing in their respective folders (with the respective keycloak configuration)