Review

Iterator.next() is invoked without prior check of hasNext().

• missing/condition/value_or_state

com/itextpdf/awt/PdfGraphics2D.java

drawImage(Image, Image, AffineTransform, Color, ImageObserver)

class PdfGraphics2D {
    private boolean drawImage(Image img, Image mask, AffineTransform xform, Color bgColor, ImageObserver obs) {
        if (xform==null)
            xform = new AffineTransform();
        else
            xform = new AffineTransform(xform);
        xform.translate(0, img.getHeight(obs));
        xform.scale(img.getWidth(obs), img.getHeight(obs));

        AffineTransform inverse = this.normalizeMatrix();
        AffineTransform flipper = AffineTransform.getScaleInstance(1,-1);
        inverse.concatenate(xform);
        inverse.concatenate(flipper);

        double[] mx = new double[6];
        inverse.getMatrix(mx);
        if (currentFillGState != 255) {
            PdfGState gs = fillGState[255];
            if (gs == null) {
                gs = new PdfGState();
                gs.setFillOpacity(1);
                fillGState[255] = gs;
            }
            cb.setGState(gs);
        }

        try {
            com.itextpdf.text.Image image = null;
            if(!convertImagesToJPEG){
                image = com.itextpdf.text.Image.getInstance(img, bgColor);
            }
            else{
                BufferedImage scaled = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);
                Graphics2D g3 = scaled.createGraphics();
                g3.drawImage(img, 0, 0, img.getWidth(null), img.getHeight(null), null);
                g3.dispose();

                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ImageWriteParam iwparam = new JPEGImageWriteParam(Locale.getDefault());
                iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
                iwparam.setCompressionQuality(jpegQuality);//Set here your compression rate
                ImageWriter iw = ImageIO.getImageWritersByFormatName("jpg").next();
                ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
                iw.setOutput(ios);
                iw.write(null, new IIOImage(scaled, null, null), iwparam);
                iw.dispose();
                ios.close();

                scaled.flush();
                scaled = null;
                image = com.itextpdf.text.Image.getInstance(baos.toByteArray());

            }
            if (mask!=null) {
                com.itextpdf.text.Image msk = com.itextpdf.text.Image.getInstance(mask, null, true);
                msk.makeMask();
                msk.setInverted(true);
                image.setImageMask(msk);
            }
            cb.addImage(image, (float)mx[0], (float)mx[1], (float)mx[2], (float)mx[3], (float)mx[4], (float)mx[5]);
            Object url = getRenderingHint(HyperLinkKey.KEY_INSTANCE);
            if (url != null && !url.equals(HyperLinkKey.VALUE_HYPERLINKKEY_OFF)) {
            	PdfAction action = new  PdfAction(url.toString());
                cb.setAction(action, (float)mx[4], (float)mx[5], (float)(mx[0]+mx[4]), (float)(mx[3]+mx[5]));
            }
        } catch (Exception ex) {
            throw new IllegalArgumentException(ex);
        }
        if (currentFillGState != 255) {
            PdfGState gs = fillGState[currentFillGState];
            cb.setGState(gs);
        }
        return true;
    }

}