if( check.containsKey(layerName)){
throw new BadRequestException("Duplicate layer: " + l.toString() );
}
LayerInfo layer = findLayer(layerWorkspace, layerName);
if (layer == null) {
throw new NotFoundException("No such layer: " + l.toString());
}
appendLayers.add(layer);
appendStyles.add(layer.getDefaultStyle());
}
m.getLayers().addAll(appendLayers);