[Building Sakai] "UserDirectoryService" or "User" instances from my Tool "SelfCert"

[Gautham]

Hi Steve, 

I am getting this Error when I am accessing the "UserDirectoryService" or
"User" instances from my Tool "SelfCert".

org.sakaiproject.portal.api.PortalHandlerException:
java.lang.IllegalArgumentException: Unable to find registered context for
tool with ID sakai.selfcert

Tomcat is showing:
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid
property 'UserDirectoryService' of bean class
[org.sakaiproject.selfcert.tool.SelfCertItemsBean]: Bean property
'UserDirectoryService' is not writable or has an invalid setter method. Did
you mean 'userDirectoryService'? 

I have do changes to "applicationcontext.xml" and "SelfCertItemsBean.java"
and  as suggested by you

SelfCertItemsBean:
=========================

package org.sakaiproject.selfcert.tool;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.sakaiproject.selfcert.logic.ExternalLogic;
import org.sakaiproject.selfcert.logic.SelfCertLogic;
import org.sakaiproject.selfcert.model.SelfCertItem;

import org.sakaiproject.user.api.UserDirectoryService;
import org.sakaiproject.user.api.User;

/**
 * This is the backing bean for actions related to SelfCert Items
 * @author Sakai App Builder -AZ
 */
public class SelfCertItemsBean {

	private static Log log = LogFactory.getLog(SelfCertItemsBean.class);

	public SelfCertItem newItem = new SelfCertItem();
	public Map selectedIds = new HashMap();
	
	private UserDirectoryService userDirectoryService;
	public void setUserDirectoryService(UserDirectoryService
userDirectoryService)
	{
		this.userDirectoryService = userDirectoryService;
	}

	private User user;
	public void setUser(User user)
	{
		this.user = user;
	}
	
	private SelfCertLogic logic;
	public void setLogic(SelfCertLogic logic) {
		this.logic = logic;
	}

	private ExternalLogic externalLogic;
	public void setExternalLogic(ExternalLogic externalLogic) {
		this.externalLogic = externalLogic;
	}

	public ArrayList messages = new ArrayList();

	public void init() {
		log.debug("init");
	}

	public SelfCertItemsBean() {
		log.debug("constructor");
	}

	public String getCurrentUserDisplayName() {
		return externalLogic.getUserDisplayName(externalLogic.getCurrentUserId());
	}

	/**
	 * @param item a SelfCertItem to check
	 * @return true if the current user can remove or update the item
	 */
	public boolean canDelete(SelfCertItem item) {
		log.debug("check Delete for: " + item.getId());
		return logic.canWriteItem(item, externalLogic.getCurrentLocationId(),
externalLogic.getCurrentUserId());
	}

	/**
	 * @return a List of SelfCertItem objects visible to the current user in
the current site
	 */
	public List getAllVisibleItems() {
		return logic.getAllVisibleItems(externalLogic.getCurrentLocationId(),
externalLogic.getCurrentUserId());
	}

	/**
	 * @param id the unique id of the item
	 * @return a SelfCertItem or null if not found
	 */
	public SelfCertItem getItemById(Long id) {
		return logic.getItemById(id);
	}

	public void addOrUpdateItem(SelfCertItem item) {
		logic.saveItem(item);
	}

	/**
	 * @param item a SelfCertItem to remove
	 * @return true if the item can be removed by the current user, false
otherwise
	 */
	public boolean checkRemoveItemById(Long id) {
		log.debug("check and Remove for: " + id);
		SelfCertItem item = logic.getItemById(id);
		if ( item != null && 
				logic.canWriteItem(item, externalLogic.getCurrentLocationId(),
externalLogic.getCurrentUserId()) ) {
			logic.removeItem(item);
			return true;
		}
		return false;
	}
	
	public String getUserType() {
		String userId = (String)externalLogic.getCurrentUserId();
		String type="";
		String currentUserId="";
		//User currentUsername="";
		
		/*try{
		User currentUser = userDirectoryService.getCurrentUser();

		//currentUsername = userDirectoryService.getCurrentUser();

		}*/
		
				
		try{
		user = userDirectoryService.getUser(userId);
		
		System.out.println("**********"+user.toString()+"****");
		
		type = user.getType();
		} 
		catch(org.sakaiproject.user.api.UserNotDefinedException unde) 
		{
			System.out.println(unde.getMessage());
		}
		
		catch(Exception e) 
		{
			type = "Type NA";
			System.out.println(e.getMessage());
		}
		return("User");
	}

==========================================

"applicationcontext.xml"
==================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" 
	"http://www.springframework.org/dtd/spring-beans.dtd">

<!-- This file generated by Sakai App Builder -AZ -->
<beans>

	<!-- list the backing beans here -->
	<bean id="itemsBean"
			class="org.sakaiproject.selfcert.tool.SelfCertItemsBean"
			init-method="init">
		<property name="logic"
			ref="org.sakaiproject.selfcert.logic.SelfCertLogic" />
		<property name="externalLogic" 
			ref="org.sakaiproject.selfcert.logic.ExternalLogic" />
	
	<property name="UserDirectoryService" 
			ref="org.sakaiproject.user.api.UserDirectoryService" />
	<property name="User" 
			ref="org.sakaiproject.user.api.User" /> 
			
	</bean>

</beans>
===============================

Does I need to add/ change any other files to access "UserDirectoryService"
or "User" instances from my Tool "SelfCert"

Any Information will be highly appreciated

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