Thread Safety

• Neither TransformerFactory nor Transformer is guaranteed to be thread-safe.

• Simplest solution is just to give each separate thread its own TransformerFactory and Transformer objects.

• The Templates class represents a parsed stylesheet. It creates new Transformer objects on demand very quickly.

• Templates is thread-safe.

  TransformerFactory xformFactory = TransformerFactory.newInstance();
  Source xsl = new StreamSource("stylesheet.xsl");
  Templates templates = xformFactory.newTemplates(xsl);
  ...
while (true) {
  InputStream  in   = getNextDocument();
  OutputStream out  = getNextTarget();
  Source request    = new StreamSource(in);
  Result response   = new StreamResult(out);
  Transformer transformer = templates.newTransformer();
  transformer.transform(request, response);
}