This error was picked up while working AOD-4359.

JSON rest requests to bamboo return a 500 Status Code. Bamboo receives the request, and processes it correctly, but then fails with the following error when writing the response.

The error is:
SEVERE: A message body writer for Java type, class com.atlassian.studio.common.appstatus.rest.AppStatusServiceResultRepresentation, and MIME media type, application/json, was not found

Chances are that the error is due to a missing json or jaxb dependency in bamboo.