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miercuri, 22 iulie 2015

Use OmniFaces Tree to render JSON

Let's suppose that we have the following JSON representation:

And we want to render this JSON as a tree hierarchy. For this we can use:

- Jackson JSON Processor and Google Collections for parsing and processing the JSON
- OmniFaces Tree component to render the result

The JSF page can be:

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns=""
  <h:panelGroup id="jsonTree">           
   <h:form id="form">              
    <o:tree value="#{treeBean.tree}" var="t" varNode="node">
         <o:treeInsertChildren />   

And the TreeBean is:

public class TreeBean implements Serializable {

 private static final long serialVersionUID = 1L;
 private static final String example = "{ JSON }";
 private TreeModel<String> tree;

 public void init() {

  tree = new ListTreeModel<>();

  ObjectMapper mapper = new ObjectMapper();
  try {
      JsonNode jsonNode = mapper.readTree(example);
      walker(null, jsonNode, tree);
  } catch (IOException ex) {
      Logger.getLogger(TreeBean.class.getName()).log(Level.SEVERE, null, ex);

 private void walker(String name, JsonNode node, TreeModel<String> tree) {

  if (node.isObject()) {
      Iterator<Map.Entry<String, JsonNode>> iterator = node.fields();
      ArrayList<Map.Entry<String, JsonNode>> nodesList = Lists.newArrayList(iterator);
      for (Map.Entry<String, JsonNode> nodEntry : nodesList) {
           String nameName = nodEntry.getKey();
           JsonNode newNode = nodEntry.getValue();
           if (newNode.isObject()) {
               walker(null, newNode, tree.addChild(nameName));
           } else if (newNode.isValueNode()) {
               tree.addChild(nameName + ":" + newNode.asText());
           } else {
               walker(nameName, newNode, tree);
  } else if (node.isArray()) {
             TreeModel<String> treea = tree.addChild(name);
             Iterator<JsonNode> arrayItemsIterator = node.elements();
             ArrayList<JsonNode> arrayItemsList =   
             for (JsonNode arrayNode : arrayItemsList) {
                  walker(null, arrayNode, treea);
  } else {
      if (node.isValueNode()) {
      } else {

 public TreeModel<String> getTree() {
  return tree;


The rendered output will be:

The complete code is available on GitHub.

You may be also interested in:
Expose a path as an OmniFaces tree (<o:tree>)
Building dynamic responsive multi-level menus with plain HTML and OmniFaces by Oleg Varaksin

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