code: protected String failMsg(final Throwable thrwbl, final String queue, final Job job) throws IOException {
          final JobFailure failure = new JobFailure();
          failure.setFailedAt(new Date());
          failure.setWorker(this.name);
          failure.setQueue(queue);
          failure.setPayload(job);
          failure.setThrowable(thrwbl);
          return ObjectMapperFactory.get().writeValueAsString(failure);
      }
docs: Create and serialize a JobFailure.
  
  @param thrwbl the Throwable that occurred
  @param queue the queue the job came from
  @param job the Job that failed
  @return the JSON representation of a new JobFailure
  @throws IOException if there was an error serializing the JobFailure