Bug 203026 Can not export chart to doc.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
* Get all the files under the specified folder (including all the files
	 * under sub-folders)
	 * 
	 * @param dir -
	 *            the folder to look into
	 * @param fileList -
	 *            the fileList to be returned
	 */
	private void getAllJarFiles( File dir, ArrayList fileList )
	{
		if ( dir.exists( ) && dir.isDirectory( ) )
		{
			File[] files = dir.listFiles( );
			if ( files == null )
				return;
			for ( int i = 0; i < files.length; i++ )
			{
				File file = files[i];
				if ( file.isFile( ) )
				{
					if ( file.getName( ).endsWith( ".jar" ) ) 
						fileList.add( file );
				}
				else if ( file.isDirectory( ) )
				{
					getAllJarFiles( file, fileList );
				}
			}
		}
	}