Converting a tiff to pdf using iText.

TiffToPDFConverter

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.io.FileChannelRandomAccessSource;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.RandomAccessFileOrArray;
import com.itextpdf.text.pdf.codec.TiffImage;

public class TiffToPDFConverter {
  
	public boolean Convert(List<String> files, String pdfFilename)
	{
		boolean converted = false;
		try {
			Document pdf = new Document();		
			PdfWriter.getInstance(pdf, new FileOutputStream(pdfFilename));
			pdf.open();

			int filesAdded = 0;
			for(String tiffFilename : files)
			{
				try 
				{
					FileChannelRandomAccessSource source = new FileChannelRandomAccessSource(
						new FileInputStream(tiffFilename).getChannel());
					RandomAccessFileOrArray file = new RandomAccessFileOrArray(source);
					int pages = TiffImage.getNumberOfPages(file);
					for (int page = 1; page <= pages; page++){
						Image img = TiffImage.getTiffImage(file, page);
						if (pdf.add(img)) filesAdded++;
					}
					
				} catch (IOException ex) {
          throw ex;
        }	
			}
			
			pdf.close();
			
			converted = IOHelper.DoesFileExist(pdfFilename) 
				&& filesAdded == files.size();
			
		} catch (FileNotFoundException | DocumentException e1) {
      throw e1;
    }
		
		return converted;
	}

}

Great dude! I have some days trying to make a conversion from tiff to PDF (just for fun and learn) using a java 3rd party with mulesoft and I'm getting error in the method converted = IOHelper.DoesFileExist(pdfFilename), is undefined for the type IOHelper... and I DON'T HAVE ANY IDEA how solve it (I'm not a really programer, but that's why I'm learning). Any recommendation?