Need to Java Project component design and API contract Complete

For this Application, the interactions (for general understanding, not for implementation at this moment) with the application should be as follows: 1. There’s a back-end application that has an exposed API allowing users to be authenticated and authorized (use data model ) – UserManagementService; 2. User must be logged in and have obtained a token. For simplicity, imagine the token is a simple ID, like a number, UUID, hash, something else, produced by the UserManagementService at the first authentication request and returned to the user for further authorization purposes. 3. After the user has been authenticated and obtained a token, he/she is able to use other APIs, related to publishing and obtaining messages; in case of unauthenticated access user should be simply redirected to UserManagementService to obtain a token; if the user has a token but his/her rights are insufficient to perform a request – there should be appropriate response with HTTP status 401; 4. Using other APIs, the user is able to publish messages and/or receive messages published by other users. .......................................................................... requirements details in attach section Remember: you can't do anything outside this attached [login to view URL] requirements . Must be complete all above [login to view URL] requirements