import org.apache.commons.imaging.formats.jpeg.xmp.JpegXmpRewriter;

AmazonS3Client client = nfile.getS3Client() //get S3 client
S3Object object1 = client.getObject(
                  new GetObjectRequest("test-bucket", "myfile.jpg")) //get the object.

InputStream isNew1 = object1.getObjectContent(); //create input stream
ByteArrayOutputStream os = new ByteArrayOutputStream();
PipedInputStream inpipe = new PipedInputStream();
final PipedOutputStream out = new PipedOutputStream(inpipe);

try {
   String xmpXml = "<x:xmpmeta>" +
    "n<Lifeshare>" +
    "nt<Date>"+"some date"+"</Date>" +
    "n</Lifeshare>" +
    "n</x:xmpmeta>";/
   JpegXmpRewriter rewriter = new JpegXmpRewriter();
   rewriter.updateXmpXml(isNew1,os, xmpXml); //This is step2

   try {
         println "starting writeto"
         os.writeTo(out);
         println "ending writeto"
         os.close();
         out.close();
   } catch (IOException e) {
         // logging and exception handling should go here
   }

}
finally {
   isNew1.close()
   os.close()
   out.close()
}