Using Jackson to parse JSON

package com.adx.web.member.service;
import static org.junit.Assert.*;
import org.apache.commons.lang3.StringEscapeUtils;
import org.junit.Before;
import org.junit.Test;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
public class JacksonTest {
	private Singleton singleton;
	@Before
	public void setUp(){
		singleton = Singleton.getInstance();
		singleton.setName("John");
	}	
	@Test
	/**
	 * We use JACKSON to process JSON data
	 *  Example - an be used to convert a JSON object as a  String  (com.fasterxml.jackson.databind writeValueAsString )
	 *   
	*/
	public void  jackSonTest () throws Exception{
		assertNotNull(singleton.getName());
		assertNotNull( Util.serializeJSONWithNonNull(singleton)); //{\"name\":\"John\"}
	}
	/** In Javascript, we can use JQUERY to parse JSON
		var obj = $.parseJSON('{ "name": "John" }' );
		alert( obj.name === "John" );
	*/
	}

final class Singleton {
    private static final Singleton INSTANCE = new Singleton();
    private String name;
    private Singleton() {
        if (Singleton.INSTANCE != null) {
            throw new IllegalStateException("Already instantiated");
        }
    }
    public static Singleton getInstance() {
        return Singleton.INSTANCE;
    }
    public void setName(String name) {
    	this.name = name;
	}
	public String getName() {
		return name;
	}
}


class  Util {
	// We use JACKSON  com.fasterxml.jackson.databind to convert a JSON object as a  String
	public static String serializeJSONWithNonNull(Object object) throws Exception{
		ObjectMapper mapper = new ObjectMapper();
		mapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
		mapper.setSerializationInclusion(Include.NON_NULL);
		return  EscapedJSON( mapper.writeValueAsString(object));
	}
	private static  String EscapedJSON(String jsonStr){
		  return  StringEscapeUtils.escapeEcmaScript(jsonStr);
	}
}