[UWS] Fix synchronization bug while generating the default Job ID

import java.io.IOException;

import java.text.DateFormat;

import java.text.DecimalFormat;

import java.text.FieldPosition;

import java.text.ParsePosition;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

 * </ul>

 * 

 * @author	Grégory Mantelet (CDS;ARI)

 * @version	4.1 (08/2014)

 * @version	4.1 (10/2014)

 */

public class UWSJob extends SerializableUWSObject {

	private static final long serialVersionUID = 1L;

	 * @return	A unique job identifier.

	 */

	protected String generateJobId(){

		synchronized(lastId){

			String generatedId = System.currentTimeMillis() + "A";

			if (lastId != null){

				while(lastId.equals(generatedId))

			lastId = generatedId;

			return generatedId;

		}

	}

	/**

	 * <p>Gets the value of the specified parameter.</p>