java.lang.Exception: There were class format errors. This is often
>>>>> caused by API only jars on the classpath. If you are using maven then you
>>>>> need to place these after the CDI unit dependency as 'provided' scope is
>>>>> still available during testing.
java.lang.Exception: Could not unmarshal response to type 'org.apache.gearpump.cluster.MasterToAppMaster$AppMastersData' for `responseAs` assertion: UnsupportedContentType(Expected 'application/json')
Response was: HttpResponse(500 Internal Server Error,HttpEntity(text/plain; charset=UTF-8,An error occurred: Recipient[Actor[akka://system/user/master#1606392638]] had already been terminated.),List(),HTTP/1.1)