Use Web Application Framework to handle any unexpected error and return a HTTP 500 response.

• Any runtime exception should be caught by the REST Controller and it should return a HTTP 500 Response with some details of the error message.
• 'Expected' exceptions for certain use-cases can still be handled by the relevant REST API method. e.g. A Model or Data Parsing exception could still return a HTTP 200 Response if so required and not be affected by the solution for this user story