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How to bring image to the front(of the text/image) or send the image to the back((of the text/image)) in IText7(7.0.8) using Java?

import java.io.FileNotFoundException;
import java.io.IOException;

import com.itextpdf.io.image.ImageData;
import com.itextpdf.io.image.ImageDataFactory;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfResources;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;

public class AddImageUnderlayToPDF 
 public static void main(String args) throws FileNotFoundException, IOException 
 PdfDocument pdfDoc = new PdfDocument(new PdfReader("c:\Development\test.pdf"),
 new PdfWriter("c:\Development\test_result.pdf"));
 ImageData img = ImageDataFactory.create("c:\Development\kishore signature.png");
 PdfCanvas under = new PdfCanvas(pdfDoc.getFirstPage().newContentStreamBefore(), new PdfResources(), pdfDoc);
 under.addImage(img, 100, 0f, 0f, 100, 100, 300, false);
 under.saveState();
 pdfDoc.close();
 

..but it doesn't work, it doesn't show the image in the pdf. I also I noticed an error while opening the pdf:

Similar approach is working fine for the text but not the images. Any help is appreciated.

The error is the same as in your earlier question: You use a throw-away resources object, so the image resource is missing in the result.

You can fix this by using the actual page resources. Simply replace

PdfCanvas under = new PdfCanvas(pdfDoc.getFirstPage().newContentStreamBefore(), new PdfResources(), pdfDoc);

by

PdfCanvas under = new PdfCanvas(pdfDoc.getFirstPage().newContentStreamBefore(), pdfDoc.getFirstPage().getResources(), pdfDoc);

Furthermore, drop the

under.saveState();

line as saveState only makes sense if you later use a matching restoreState.