java.lang.NullPointerException :( still have record but can not fill to listbox :( it make me sad

package de.forsthaus.webui.blog;

import java.util.ArrayList; 
import mcrt.model.UserRole;
import mcrt.model.UserRoleServices; 
/*
 * Created by SonPham - [email protected]
 */
public class DummyUserRole {
	private static ArrayList<UserRole> personList = new ArrayList<UserRole>();

	static {
		setPersonList();
	}

	public static ArrayList<UserRole> getPersonList() {
		return personList;
	}

	private static void setPersonList() {

		UserRoleServices uservices = new UserRoleServices();

		for (int i = 0; i < uservices.findAll().size(); i++) {
			UserRole personx = new UserRole();
			//personx.setsDescription(uservices.findAll().get(i).getsDescription());
			personList.add(new UserRole(uservices.findAll().get(i).getID(), uservices.findAll().get(i).getFunctionID(),uservices.findAll().get(i).getUserName(),uservices.findAll().get(i).getviewRole(), uservices.findAll().get(i).geteditRole(), uservices.findAll().get(i).getdeleteRole(),
					uservices.findAll().get(i).getUserID() ,uservices.findAll().get(i).getFunctionName()));
			
		}

	}
}

package de.forsthaus.webui.blog;
 
import mcrt.model.UserRole;
 
import org.zkoss.zul.Listcell;
import org.zkoss.zul.Listitem;
import org.zkoss.zul.ListitemRenderer;

public class UserRoleRender implements ListitemRenderer {

	public void render(Listitem item, Object data) throws Exception {
		UserRole person = (UserRole) data;
		item.setValue(person); 
		Listcell lc;  
		lc = new Listcell(String.valueOf(person.getFunctionName()));  lc.setParent(item); 
		lc = new Listcell(String.valueOf(person.getUserName()));lc.setParent(item);
		lc = new Listcell(String.valueOf(person.getviewRole()));lc.setParent(item); 
		lc = new Listcell(String.valueOf(person.geteditRole()));lc.setParent(item);
		lc = new Listcell(String.valueOf(person.getdeleteRole()));lc.setParent(item);
		
	}
}

package mcrt.model;
 
import java.sql.ResultSet;
import java.sql.SQLException; 
import java.util.List;
import java.util.LinkedList;

import org.zkoss.zk.ui.Executions;

import mcrt.config.ConnectODBC_DSN;

public class UserRoleServices implements UserRoleInterface {

	// data model
	private List<UserRole> userRole = new LinkedList<UserRole>(); 
	public UserRoleServices() {
		try {
			try {
				ConnectODBC_DSN conDSN = new ConnectODBC_DSN();
				ResultSet rs = conDSN.GetResultSet("tblUserFunctionRole");
				
				while (rs.next()) {
					
					String ID = rs.getString("ID");
					String UserID = rs.getString("userID");
					String FunctionID = rs.getString("functionID"); 
					String viewRole = rs.getString("viewRole");
					String editRole = rs.getString("editRole");
					String deleteRole = rs.getString("deleteRole");
					String UserName = rs.getString("userName");
					String FunctionName = rs.getString("functionName");
					System.out.println("Access: "+  ID + "-" + UserID + "-" + FunctionID + "-" + viewRole + "-" + editRole + "-" + deleteRole + "-" + 
							UserName + "-" + FunctionName );
					userRole.add(new UserRole(ID, UserID,FunctionID, viewRole, editRole,deleteRole,
							UserName,FunctionName) ); 
				}
			} catch (SQLException s) {
				System.out.println("ERROR SQL: " + s);
			}
		} catch (Exception a) {
			a.printStackTrace();
		}
	}

	@Override
	public List<UserRole> findAll() {
		// TODO Auto-generated method stub
		return userRole;
	}
	
	public void checkRole(String username){
		try {
			try {
				ConnectODBC_DSN conDSN = new ConnectODBC_DSN();
				ResultSet rs = conDSN.processSQL("select * from tblUserFunctionRole where FunctionID=" + username);
				while (rs.next()) {
					String ID = rs.getString("ID");
					String UserID = rs.getString("userID");
					String FunctionID = rs.getString("functionID"); 
					String viewRole = rs.getString("viewRole");
					String editRole = rs.getString("editRole");
					String deleteRole = rs.getString("deleteRole");
					String UserName = rs.getString("userName");
					String FunctionName = rs.getString("functionName");
					userRole.add(new UserRole(ID, UserID,FunctionID, viewRole, editRole,deleteRole,
							UserName,FunctionName)  ); 
				}
			} catch (SQLException s) {
				System.out.println("SQL statement is not executed!");
			}
		} catch (Exception a) {
			a.printStackTrace();
		}
	}
	
	@Override
	public String insertRole(String Username,int FunctionID,int viewRole,int editRole,int deleteRole){
		System.out.println(Username);
		try {
			try {
				ConnectODBC_DSN conDSN = new ConnectODBC_DSN();
				System.out.println(conDSN.returnID("select iUserID from tblUser where sUserName='" + Username.toUpperCase() +"'"));
				conDSN.executeSQL("INSERT INTO tblUserFunctionRole" +
						"(userID, functionID, viewRole, editRole, deleteRole) " +
						"VALUES(" + conDSN.returnID("select iUserID from tblUsers where sUserName='" + Username.toUpperCase() +"'") +
						"," + FunctionID + "," + viewRole + "," + editRole + "," + deleteRole + ")");
				return "success";
				 
			} catch (SQLException s) {
				System.out.println("SQL statement is not executed!");
				return "error";
			}
		} catch (Exception a) {
			a.printStackTrace();
			return "error";
		}
	}

	//Search with function ID
	@Override
	public List<UserRole> search(int keyword) {
		try {
			try {
				ConnectODBC_DSN conDSN = new ConnectODBC_DSN();
				ResultSet rs = conDSN.processSQL("select * from tblUserFunctionRole where FunctionID=" + keyword);
				while (rs.next()) {
					String ID = rs.getString("ID");
					String UserID = rs.getString("userID");
					String FunctionID = rs.getString("functionID"); 
					String viewRole = rs.getString("viewRole");
					String editRole = rs.getString("editRole");
					String deleteRole = rs.getString("deleteRole");
					String UserName = rs.getString("userName");
					String FunctionName = rs.getString("functionName");
					userRole.add(new UserRole(ID, UserID,FunctionID, viewRole, editRole,deleteRole,
							UserName,FunctionName)  ); 
				}
			} catch (SQLException s) {
				System.out.println("SQL statement is not executed!");
			}
		} catch (Exception a) {
			a.printStackTrace();
		}
		
		return userRole;
	}
 
	@Override
	public List<UserRole> getDetails(String keyword) {
		try {
			try {
				ConnectODBC_DSN conDSN = new ConnectODBC_DSN();
				ResultSet rs = conDSN.processSQL("select * from tblUserFunctionRole where UserID=" + keyword);
				while (rs.next()) {
					String ID = rs.getString("ID");
					String UserID = rs.getString("userID");
					String FunctionID = rs.getString("functionID"); 
					String viewRole = rs.getString("viewRole");
					String editRole = rs.getString("editRole");
					String deleteRole = rs.getString("deleteRole");
					String UserName = rs.getString("userName");
					String FunctionName = rs.getString("functionName");
					userRole.add(new UserRole(ID, UserID,FunctionID, viewRole, editRole,deleteRole,
							UserName,FunctionName)); 
				}
			} catch (SQLException s) {
				System.out.println("SQL statement is not executed!");
			}
		} catch (Exception a) {
			a.printStackTrace();
		}
		
		return userRole;
	}

	@Override
	public List<UserRole> getUser(int UserID) {
		// TODO Auto-generated method stub
		return null;
	}

}