Make a Tree Object Structure as a Tree View

Mark the fields as @Id, @Name, @Children for id field, displayable name field, and the children item field. And use the face 'dwr/metaworks/genericfaces/TreeFace.ejs'

package org.uengine.social;

import org.metaworks.annotation.Children;
import org.metaworks.annotation.Face;
import org.metaworks.annotation.Id;
import org.metaworks.annotation.Name;

import java.util.List;

/**
 * Created by jjy on 2016. 9. 19..
 */
@Face(ejsPath="dwr/metaworks/genericfaces/TreeFace.ejs")
public class ProcessInstanceExplorerNode{

    String instanceId;
    @Id
        public String getInstanceId() {
            return instanceId;
        }
        public void setInstanceId(String instanceId) {
            this.instanceId = instanceId;
        }

    String name;
    @Name
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }

    List<ProcessInstanceExplorerNode> childInstances;
    @Children
        public List<ProcessInstanceExplorerNode> getChildInstances() {
            return childInstances;
        }
        public void setChildInstances(List<ProcessInstanceExplorerNode> childInstances) {
            this.childInstances = childInstances;
        }


}

And add the object as a field where you wish to locate it.

package org.uengine.social;

import org.uengine.codi.mw3.model.IInstance;
import org.uengine.codi.mw3.model.Instance;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by jjy on 2016. 9. 19..
 */
public class ProcessInstanceExplorer {

    ProcessInstanceExplorerNode root;
        public ProcessInstanceExplorerNode getRoot() {
            return root;
        }
        public void setRoot(ProcessInstanceExplorerNode root) {
            this.root = root;
        }


    public void load(long rootInstanceId) throws Exception {

        setRoot(new ProcessInstanceExplorerNode());

        IInstance instances = Instance.loadForAllChildInstances(rootInstanceId);
        List<ProcessInstanceExplorerNode> processInstanceExplorerNodeList = new ArrayList<ProcessInstanceExplorerNode>();

        while(instances.next()){
            ProcessInstanceExplorerNode processInstanceExplorerNode = new ProcessInstanceExplorerNode();
            processInstanceExplorerNode.setName(instances.getName());
            processInstanceExplorerNode.setInstanceId(instances.getInstId());

            processInstanceExplorerNodeList.add(processInstanceExplorerNode);
        }

        //TODO:  change the data to be structured as a tree by recursively finding the parentInstanceId

        getRoot().setChildInstances(processInstanceExplorerNodeList);


    }


}