Started troubleshooting why all four of the JSON tests are failing.
During the initial investigation, I added/fixed these:
 - Added assertEquals(Status.OK.getStatusCode(), response.getStatus()) to all of the tests.
 - Corrected the WebTarget in testGetFibonacciArray_JSON() from "http...fibonacci" to "http...fibonacciArray".
 - Corrected the MediaType in testPutFibonacciString_JSON() from APPLICATION_XML to APPLICATION_JSON.
The two get() tests are failing with:
 - javax.ws.rs.ProcessingException: Error reading entity from input stream.
The two put() tests are failing with:
 - org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException:
      MessageBodyReader not found for media
         type=text/plain,
         type=class com.thescheideggers.fibonacciservice.FibonacciResponseString,
         genericType=class com.thescheideggers.fibonacciservice.FibonacciResponseString.