> +      }
> +
> +      if (droplet == null) {
> +         throw new NoSuchElementException("Cannot find droplet with id: " + 
> id);
> +      }
> +
> +      return new 
> ImageTemplateBuilder.CloneImageTemplateBuilder().nodeId(id).name(name).build();
> +   }
> +
> +   @Override
> +   public ListenableFuture<Image> createImage(ImageTemplate template) {
> +      checkState(template instanceof CloneImageTemplate, " digitalocean only 
> supports creating images through cloning.");
> +      final CloneImageTemplate cloneTemplate = (CloneImageTemplate) template;
> +
> +      // Droplet needs to be stopped
> +      int powerOffEvent = 
> api.getDropletApi().powerOff(Integer.parseInt(cloneTemplate.getSourceNodeId()));

Could `getSourceNodeId()` return a non-numeric string here?

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