Bug 136246 [regression]Export data exported error column name.
Description: Export data exported error column name. Steps to reproduce: 1. export data in a table, select several columns. Expected result: Selected column name and data are exported. Actual result: No matter what columns you selected, exported columns name always display columns beginning from the first, and then the second, and so on.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
*/
	public IReportDocument openReportDocument( String docName )
	{
		IReportDocument document = null;
		try
		{
			synchronized ( this.getClass( ) )
			{
				document = engine.openReportDocument( docName );
			}
		}
		catch ( Exception e )
		{
		}
		return document;
	}
	/**
	 * Render image.
	 * 
	 * @param imageId
	 * @param outputStream
	 * @throws EngineException
	 */
	public void renderImage( String imageId, ServletOutputStream outputStream )
			throws RemoteException
	{
		assert ( this.imageHandler != null );
		try
		{
			this.imageHandler.getImage( outputStream, this.imageDirectory,