in cxf-xjc-plugin/src/main/java/org/apache/cxf/maven_plugin/XJCErrorListener.java [111:120]
public void warning(SAXParseException exception) {
File file = mapFile(exception.getSystemId());
if (file != null && !errorfiles.contains(file)) {
buildContext.removeMessages(file);
errorfiles.add(file);
}
buildContext.addMessage(file, exception.getLineNumber(), exception.getColumnNumber(),
mapMessage(exception.getLocalizedMessage()),
BuildContext.SEVERITY_WARNING, exception);
}