Java REST API
Postman

The simple API for University class schedule managing

At first I created mock server at Postman for using it during API development. In the end I decided to significantly change endpoints because of my low experience. Also, not all possible use cases and response statuses are considered here - there are another projects in my portfolio with right statuses or reliable business logic. The mock server: https://documenter.getpostman.com/view/24243074/2s935sp332
To write API i used JAX-RS, database: sqlite. JDBC driver used to communicate with database. A few requests from Postman client:

Get all courses
Delete error - because of database constraint (status code has to be 409 I know)
Successful deleting
Post deleted course

Postman client written in Client.postman_collection.json in repository. I didn't follow any tutorial to create this project. I used the knowledge I gained during my studies. You can download and see the code.