}
            }
        }
        return Collections.emptySet();
    }

    private String defaultMavenToolchainsDefinitionsLocation() {
        return new File(MavenUtil.getUserMavenDir(), "toolchains.xml").getAbsolutePath();
    }

    private static class PropagatingErrorHandler implements ErrorHandler {
        @Override
        public void warning(SAXParseException e) throws SAXException {