sample.java

    public static void recursiveNode(JsonNode node) {
        Iterator<Map.Entry<String, JsonNode>> it = node.fields();

        if (node.isTextual() & node.toString().contains("sample")) {
            System.out.println(node.toString());
        }

        while (it.hasNext()) {
            JsonNode temp = it.next().getValue();
            recursiveNode(temp);
        }
    }