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iText difference between PdfCopy and PdfACopy

I wrote a function to embed a file as attachment inside a PDF/A-3a document using iText 5.5.13 (using instructions from iText tutorials).
If I attach the file using the class PdfCopy, the result is a correct PDF file, but it does not claim to be PDF/A (maybe it matches all the requirements, but it doesn't say).
If I do the same using PdfACopy, I get an wrongly built document:
InvalidPdfException: Rebuild failed: trailer not found.; Original
message: PDF startxref not found.
Here is my code a little simplified. Commented is the line to use a PdfCopy instead.
public static File embedFile(File inputPdf) {
File outputPdf = new File("./test.pdf");
PdfReader reader = new PdfReader(inputPdf.getAbsolutePath());
Document document = new com.itextpdf.text.Document();
OutputStream os = new FileOutputStream(outputPdf.getAbsolutePath());
PdfACopy copy = new PdfACopy(document, os, PdfAConformanceLevel.PDF_A_3A); // Output doc doesn't work
// PdfCopy copy = new PdfCopy(document, os); // Output doc works but doesn't claim to be PDF/A
document.open();
copy.addDocument(reader);
// Include attachment (extactly as in the sample tutorial)
PdfDictionary parameters = new PdfDictionary();
parameters.put(PdfName.MODDATE, new PdfDate());
PdfFileSpecification fileSpec = PdfFileSpecification.fileEmbedded(
writer, "./src/main/resources/com/itextpdf/invoice.xml",
"invoice.xml", null, "application/xml", parameters, 0);
fileSpec.put(new PdfName("AFRelationship"), new PdfName("Data"));
writer.addFileAttachment("invoice.xml", fileSpec);
PdfArray array = new PdfArray();
array.add(fileSpec.getReference());
writer.getExtraCatalog().put(new PdfName("AF"), array);
os.flush();
reader.close();
document.close();
os.close();
copy.close();
return outputPdf;
}
The input file is already a PDF/A-3a document, so I think I don't need to redefine all the required things like embedded fonts, output intent...
Is there maybe a missing step that is mandatory when using PdfACopy that is not required with PdfCopy?
Would it help to try with iText 7?
Many thanks in advance!

As pointed by Bruno Lowagie in the comments, this is possible with iText 7. Here the function in case it helps someone:
public static File embedFile(File inputPdf, File embeddedFile, String embeddedFileName, String embeddedFileMimeType)
throws IOException {
File outputPdf = new File("./test.pdf");
PdfReader reader = new PdfReader(inputPdf.getAbsolutePath());
PdfWriter writer = new PdfWriter(outputPdf.getAbsolutePath());
PdfADocument pdfDoc = new PdfADocument(reader, writer);
// Add attachment
PdfDictionary parameters = new PdfDictionary();
parameters.put(PdfName.ModDate, new PdfDate().getPdfObject());
PdfFileSpec fileSpec = PdfFileSpec.createEmbeddedFileSpec(pdfDoc, embeddedFile.getAbsolutePath(), embeddedFileName,
embeddedFileName, new PdfName(embeddedFileMimeType), parameters, PdfName.Data);
fileSpec.put(new PdfName("AFRelationship"), new PdfName("Data"));
pdfDoc.addFileAttachment(embeddedFileName, fileSpec);
PdfArray array = new PdfArray();
array.add(fileSpec.getPdfObject().getIndirectReference());
pdfDoc.getCatalog().put(new PdfName("AF"), array);
pdfDoc.close();
reader.close();
writer.close();
return outputPdf;
}

making pdf as password protected with java

I want to make an existing PDF as password protected for which I'm using the itext I am following this URL
http://howtodoinjava.com/2014/07/29/create-pdf-files-in-java-itext-tutorial/
I have developed a program which will send the mail with the PDF as attachment. Below is the code where I am making the PDF file as password protected.
Right now the PDF file is attached in mail but when I am trying to open it, I get an error that it is damaged.
What am I doing wrong in the code below?
// attachment part
MimeBodyPart attachPart = new MimeBodyPart();
String filename = "c:\\SettingupRulesin outlook2003.pdf";
//OutputStream file = new FileOutputStream(new File("PasswordProtected.pdf"));
final OutputStream os = new FileOutputStream(filename);
com.itextpdf.text.Document doc = new com.itextpdf.text.Document();
PdfWriter writer = PdfWriter.getInstance(doc, os);
writer.setEncryption(USER_PASSWORD.getBytes(),
OWNER_PASSWORD.getBytes(), PdfWriter.ALLOW_PRINTING,
PdfWriter.ENCRYPTION_AES_128);
os.close();
DataSource source = new FileDataSource(filename);
attachPart.setDataHandler(new DataHandler(source));
attachPart.setFileName(filename);

You use a PdfWriter. That class can be used to create new PDFs from scratch, not to manipulate existing ones. Please use a PdfStamper instead which is for manipulating existing documents.

Convert Outputstream to file

Well i'm stucked with a problem,
I need to create a PDF with a html source and i did this way:
File pdf = new File("/home/wrk/relatorio.pdf");
OutputStream out = new FileOutputStream(pdf);
InputStream input = new ByteArrayInputStream(build.toString().getBytes());//Build is a StringBuilder obj
Tidy tidy = new Tidy();
Document doc = tidy.parseDOM(input, null);
ITextRenderer renderer = new ITextRenderer();
renderer.setDocument(doc, null);
renderer.layout();
renderer.createPDF(out);
out.flush();
out.close();
well i'm using JSP so i need to download this file to the user not write in the server...
How do I transform this Outputstream output to a file in the java without write this file in hard drive ?

If you're using VRaptor 3.3.0+ you can use the ByteArrayDownload class. Starting with your code, you can use this:
#Path("/download-relatorio")
public Download download() {
// Everything will be stored into this OutputStream
ByteArrayOutputStream out = new ByteArrayOutputStream();
InputStream input = new ByteArrayInputStream(build.toString().getBytes());
Tidy tidy = new Tidy();
Document doc = tidy.parseDOM(input, null);
ITextRenderer renderer = new ITextRenderer();
renderer.setDocument(doc, null);
renderer.layout();
renderer.createPDF(out);
out.flush();
out.close();
// Now that you have finished, return a new ByteArrayDownload()
// The 2nd and 3rd parameters are the Content-Type and File Name
// (which will be shown to the end-user)
return new ByteArrayDownload(out.toByteArray(), "application/pdf", "Relatorio.pdf");
}

A File object does not actually hold the data but delegates all operations to the file system (see this discussion).
You could, however, create a temporary file using File.createTempFile. Also look here for a possible alternative without using a File object.

use temporary files.
File temp = File.createTempFile(prefix ,suffix);
prefix -- The prefix string defines the files name; must be at least three characters long.
suffix -- The suffix string defines the file's extension; if null the suffix ".tmp" will be used.

Fail to upload a image file into Google Doc via java api

below is my code
DocsService client = new DocsService("testappv1");
client.setUserCredentials(username, password);
client.setProtocolVersion(DocsService.Versions.V2);
File file = new File("C:/test.jpg");
DocumentEntry newDocument = new DocumentEntry();
newDocument.setTitle(new PlainTextConstruct("test"));
String mimeType = DocumentListEntry.MediaType.fromFileName(file.getName()).getMimeType();
newDocument.setMediaSource(new MediaFileSource(file, mimeType));
newDocument = client.insert(destFolderUrl, newDocument);
the document was created successful, but it did not contain anything.

try the following
client.insert(new URL("https://docs.google.com/feeds/documents/private/full/?convert=false"), newDocument);
i think the ?convert=false bit is important, not sure how you do that without the url
client.insert(new URL(destFolderUrl+ "?convert=false"), newDocument);
would hopefully work in your case

Getting XML data from the byteArray of a zipFile

I'm writing a simple program that retrieves XML data from an object, and parses it dynamically, based on user criteria. I am having trouble getting the XML data from the object, due to the format it is available in.
The object containing the XML returns the data as a byteArray of a zipFile, like so.
MyObject data = getData();
byte[] byteArray = data.getPayload();
//The above returns the byteArray of a zipFile
The way I checked this, is by writing the byteArray to a String
String str = new String(byteArray);
//The above returns a string with strange characters in it.
Then I wrote the data to a file.
FileOutputStream fos = new FileOutputStream("new.txt");
fos.write(byteArray);
I renamed new.txt as new.zip. When I opened it using WinRAR, out popped the XML.
My problem is that, I don't know how to do this conversion in Java using streams, without writing the data to a zip file first, and then reading it. Writing data to disk will make the software way too slow.
Any ideas/code snippets/info you could give me would be really appreciated!! Thanks
Also, if you need a better explanation from me, I'd be happy to elaborate.
As another option, I am wondering whether an XMLReader would work with a ZipInputStream as InputSource.
ByteArrayInputStream bis = new ByteArrayInputStream(byteArray);
ZipInputStream zis = new ZipInputStream(bis);
InputSource inputSource = new InputSource(zis);

A zip archive can contain several files. You have to position the zip stream on the first entry before parsing the content:
ByteArrayInputStream bis = new ByteArrayInputStream(byteArray);
ZipInputStream zis = new ZipInputStream(bis);
ZipEntry entry = zis.getNextEntry();
InputSource inputSource = new InputSource(new BoundedInputStream(zis, entry.getCompressedSize()));
The BoundedInputStream class is taken from Apache Commons IO (http://commons.apache.org/io)