Update content in Webscript

private void updateContent(NodeRef nodeRef, String path, String fileName, boolean newFile)
    {
        // Make versionable
        nodeService.addAspect(nodeRef, ContentModel.ASPECT_VERSIONABLE, null);

        // Update content
        InputStream is = this.getClass().getClassLoader().getResourceAsStream(path + fileName);
        if (is != null)
        {
            ContentWriter contentWriter = contentService.getWriter(nodeRef, ContentModel.PROP_CONTENT, true);
            if (newFile == true)
            {
                contentWriter.setMimetype(MimetypeMap.MIMETYPE_TEXT_PLAIN);
                contentWriter.setEncoding("UTF-8");
            }
            contentWriter.putContent(is);
        }
    }