Bug 180118 Enhance to print out source stack trace in preview mode.[0002]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/BirtUtility.java
return;
			
			HttpSession session = request.getSession( true );
			Map map = (Map) session.getAttribute( IBirtConstants.TASK_MAP );
			if ( map == null )
			{
				map = new HashMap( );
				session.setAttribute( IBirtConstants.TASK_MAP, map );
			}
			
			synchronized ( map )
			{
				BaseTaskBean bean = new BaseTaskBean( taskid, task );
				map.put( taskid, bean );
			}
		}
		catch ( Exception e )
		{
		}
	}
	/**
	 * Remove task from http session
	 * 
	 * @param request
	 */
	public static void removeTask( HttpServletRequest request )
	{
		if ( request == null )
			return;
		try