This is a web service that registers and authenticates users.
The main technologies used here are :

• Java Servlet Technology
• JAX-RS REST API (Jersey)
• MongoDB (as persistence)
• JUnit (unit testing)

Users are required to fill up a form which contains the following fields:

• Username (unique)
• Password
• Confirm Password
• First Name
• Middle Name (Optional)
• Last Name
• A Security question
• Answer to the security question

On sending the form to the server, validation occurs and incorrect parameters if provided results in HTTP response code 406. If passwords don't match then a 401 response code is sent. Success is 200 as usual. And upon successful server-side validation, the data is persisted on a MongoDB Atlas cluster.

Users are authenticated after submission of a form containing their username and password. Success is code 200 and failure is code 401.

A user can change any of their user detail in any order. Success is 200 and 406 if the user does not exist. For all other errors a code 500 is shown.

Each user is identified by a unique user ID which is a combination of UUID, Hex String of System.nanoTime() and some random parameter. It can only be viewed on the client but has to passed as a URL path parameter. Success is 200 as usual, failure is 406.

• Changing the unique user ID may result in duplicate inserts on username. See this SO thread thread for more details.

• Communication with Atlas cluster takes long time.

• JUnit tests not updated. May crash or may not produce desired result. Please screen test.

Status - Completed