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Here I am going to show some examples on how to use "pixymeta" library:

import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;

import pixy.image.jpeg.JPEGMeta;
import pixy.meta.Metadata;
import pixy.meta.MetadataType;
import pixy.meta.adobe.IPTC_NAA;
import pixy.meta.adobe.XMP;
import pixy.meta.adobe._8BIM;
import pixy.meta.exif.Exif;
import pixy.meta.exif.ExifTag;
import pixy.meta.exif.JpegExif;
import pixy.meta.exif.TiffExif;
import pixy.meta.iptc.IPTCApplicationTag;
import pixy.meta.iptc.IPTCDataSet;
import pixy.meta.iptc.IPTCRecord;
import pixy.image.tiff.FieldType;
import pixy.image.tiff.TiffTag;
import pixy.util.MetadataUtils;
import pixy.string.XMLUtils;

public class TestPixyMeta {
    // Obtain a logger instance
    private static final Logger LOGGER = LoggerFactory.getLogger(TestPixyMeta.class);

    public static void main(String[] args) throws IOException {
        Map<MetadataType, Metadata> metadataMap = Metadata.readMetadata(args[0]);
        LOGGER.info("Start of metadata information:");
        LOGGER.info("Total number of metadata entries: {}", metadataMap.size());

        int i = 0;
        for(Map.Entry<MetadataType, Metadata> entry : metadataMap.entrySet()) {
            LOGGER.info("Metadata entry {} - {}", i, entry.getKey());
            entry.getValue().showMetadata();
            i++;
            LOGGER.info("-----------------------------------------");
        }
        LOGGER.info("End of metadata information.");

        FileInputStream fin = null;
        FileOutputStream fout = null;

        if(metadataMap.get(MetadataType.XMP) != null) {
            XMP xmp = (XMP)metadataMap.get(MetadataType.XMP);
            Document xmpDoc = xmp.getXmpDocument();
            fin = new FileInputStream("images/1.jpg");
            fout = new FileOutputStream("1-xmp-inserted.jpg");
            if(!xmp.hasExtendedXmp())
            // Metadata.insertXMP(fin, fout, xmp);
                Metadata.insertXMP(fin, fout, XMLUtils.serializeToStringLS(xmpDoc, xmpDoc.getDocumentElement()));
            else {
                Document extendedXmpDoc = xmp.getExtendedXmpDocument();
                JPEGMeta.insertXMP(fin, fout, XMLUtils.serializeToStringLS(xmpDoc, xmpDoc.getDocumentElement()), XMLUtils.serializeToStringLS(extendedXmpDoc));
            }
            fin.close();
            fout.close();
        }

        Metadata.extractThumbnails("images/iptc-envelope.tif", "iptc-envelope");

        fin = new FileInputStream("images/iptc-envelope.tif");
        fout = new FileOutputStream("iptc-envelope-iptc-inserted.tif");

        Metadata.insertIPTC(fin, fout, createIPTCDataSet(), true);

        fin.close();
        fout.close();

        fin = new FileInputStream("images/wizard.jpg");
        fout = new FileOutputStream("wizard-iptc-inserted.jpg");

        Metadata.insertIPTC(fin, fout, createIPTCDataSet(), true);

        fin.close();
        fout.close();

        fin = new FileInputStream("images/1.jpg");
        fout = new FileOutputStream("1-irbthumbnail-inserted.jpg");

        Metadata.insertIRBThumbnail(fin, fout, createThumbnail("images/1.jpg"));

        fin.close();
        fout.close();

        fin = new FileInputStream("images/f1.tif");
        fout = new FileOutputStream("f1-irbthumbnail-inserted.tif");

        Metadata.insertIRBThumbnail(fin, fout, createThumbnail("images/f1.tif"));

        fin.close();
        fout.close();

        fin = new FileInputStream("images/exif.tif");
        fout = new FileOutputStream("exif-exif-inserted.tif");

        Metadata.insertExif(fin, fout, populateExif(TiffExif.class), true);

        fin.close();
        fout.close();

        fin = new FileInputStream("images/12.jpg");
        fout = new FileOutputStream("12-exif-inserted.jpg");

        Metadata.insertExif(fin, fout, populateExif(JpegExif.class), true);

        fin.close();
        fout.close();

        fin = new FileInputStream("images/table.jpg");
        fout = new FileOutputStream("table-metadata-removed.jpg");

        Metadata.removeMetadata(fin, fout, MetadataType.IPTC, MetadataType.PHOTOSHOP, MetadataType.ICC_PROFILE, MetadataType.XMP, MetadataType.EXIF);

        fin.close();
        fout.close();

        fin = new FileInputStream("images/12.jpg");
        fout = new FileOutputStream("12-photoshop-iptc-inserted.jpg");

        Metadata.insertIRB(fin, fout, createPhotoshopIPTC(), true);

        fin.close();
        fout.close();

        fin = new FileInputStream("images/table.jpg");
        JPEGMeta.extractDepthMap(fin, "table");

        fin.close();
    }

    private static List<IPTCDataSet> createIPTCDataSet() {
        List<IPTCDataSet> iptcs = new ArrayList<IPTCDataSet>();
        iptcs.add(new IPTCDataSet(IPTCApplicationTag.COPYRIGHT_NOTICE, "Copyright 2014-2015, yuwen_66@yahoo.com"));
        iptcs.add(new IPTCDataSet(IPTCApplicationTag.CATEGORY, "ICAFE"));
        iptcs.add(new IPTCDataSet(IPTCApplicationTag.KEY_WORDS, "Welcome 'icafe' user!"));

        return iptcs;
    }

    private static List<_8BIM> createPhotoshopIPTC() {
        IPTC_NAA iptc = new IPTC_NAA();
        iptc.addDataSet(new IPTCDataSet(IPTCApplicationTag.COPYRIGHT_NOTICE, "Copyright 2014-2015, yuwen_66@yahoo.com"));
        iptc.addDataSet(new IPTCDataSet(IPTCApplicationTag.KEY_WORDS, "Welcome 'icafe' user!"));
        iptc.addDataSet(new IPTCDataSet(IPTCApplicationTag.CATEGORY, "ICAFE"));

        return new ArrayList<_8BIM>(Arrays.asList(iptc));
    }

    private static BufferedImage createThumbnail(String filePath) throws IOException {
        FileInputStream fin = null;
        try {
            fin = new FileInputStream(filePath);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        BufferedImage thumbnail = MetadataUtils.createThumbnail(fin);

        fin.close();

        return thumbnail;
    }

    // This method is for testing only
    private static Exif populateExif(Class<?> exifClass) throws IOException {
        // Create an EXIF wrapper
        Exif exif = exifClass == (TiffExif.class)?new TiffExif() : new JpegExif();
        exif.addImageField(TiffTag.WINDOWS_XP_AUTHOR, FieldType.WINDOWSXP, "Author");
        exif.addImageField(TiffTag.WINDOWS_XP_KEYWORDS, FieldType.WINDOWSXP, "Copyright;Author");
        DateFormat formatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss");
        exif.addExifField(ExifTag.EXPOSURE_TIME, FieldType.RATIONAL, new int[] {10, 600});
        exif.addExifField(ExifTag.FNUMBER, FieldType.RATIONAL, new int[] {49, 10});
        exif.addExifField(ExifTag.ISO_SPEED_RATINGS, FieldType.SHORT, new short[]{273});
        //All four bytes should be interpreted as ASCII values - represents [0220] - new byte[]{48, 50, 50, 48}
        exif.addExifField(ExifTag.EXIF_VERSION, FieldType.UNDEFINED, "0220".getBytes());
        exif.addExifField(ExifTag.DATE_TIME_ORIGINAL, FieldType.ASCII, formatter.format(new Date()));
        exif.addExifField(ExifTag.DATE_TIME_DIGITIZED, FieldType.ASCII, formatter.format(new Date()));
        exif.addExifField(ExifTag.FOCAL_LENGTH, FieldType.RATIONAL, new int[] {240, 10});
        // Insert ThumbNailIFD
        // Since we don't provide thumbnail image, it will be created later from the input stream
        exif.setThumbnailRequired(true);

        return exif;
    }
}