If I call the getBuildResults API call with a bogus build name, then an empty (<errors></errors>) response is returned. This isn't very helpful! Internally: @40000000457ce22508ae9a54 2006-12-10 23:44:11,128 INFO [SocketListener0-2] [BuildAwareInterceptor] Build name / build key could not be found Reading BAM-455 it seems I was calling the method with the wrong arguments (calling with the right arguments improves the error message). However I'd still expect some error rather than just <errors></errors>