protected void configureTransformer(Transformer transformer, Exchange exchange) {
if (uriResolver == null) {
uriResolver = new XsltUriResolver(exchange.getContext().getClassResolver(), null);
}
transformer.setURIResolver(uriResolver);
transformer.setErrorListener(new XmlErrorListener());
transformer.clearParameters();
addParameters(transformer, exchange.getProperties());
addParameters(transformer, exchange.getIn().getHeaders());