Writer out) throws IOException {
JsonFactory dumpFactory = new JsonFactory();
JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
dumpGenerator.writeStartObject();
dumpGenerator.writeFieldName("properties");
dumpGenerator.writeStartArray();
dumpGenerator.flush();
synchronized (config) {
for (Map.Entry<Object,Object> item: config.getProps().entrySet()) {
dumpGenerator.writeStartObject();
dumpGenerator.writeStringField("key", (String) item.getKey());