pdfbox error - Colorspace can't be determined at this time, about to return NULL from unhandled branch - pdfbox

Question

I am using the following code to get a list of jpegs attached to one of my objects "PrintDocument" wich references a "Document" which references a "Page" Object. The path is being combined from Document and Page. But this is not the Problem. When I use this code and run it in simple java on the jvm, the pdf is being built without any error...
public File createPDFtoPrint(PrintDocument pdocument)
throws IncompleteDocumentException, IOException, FSException {
File tmp = null;
if(validatePrintDocument(pdocument)){
PDDocument document = new PDDocument();
Iterator<Page> iterator = pdocument.getDocument().getPageList().iterator();
while(iterator.hasNext()){
Page page = iterator.next();
PDPage pdpage = new PDPage(PDPage.PAGE_SIZE_A4);
document.addPage( pdpage );
PDPageContentStream contentStream = null;
try {
contentStream = new PDPageContentStream(document, pdpage);
} catch (IOException e) {
String message = "Error while creating contentStream for Page" + page.getPageNumber();
logger.error(message);
logger.debug(e.toString());
}
PDJpeg ximage;
try {
File imgFile = new File(docDir+"/"+pdocument.getDocument().getName()+"/"+page.getPageNumber()+".jpg");
System.out.println("*************** FILEPATH IS "+imgFile.getPath());
ximage = new PDJpeg(document,new FileInputStream(imgFile));
} catch (FileNotFoundException e) {
String message = "File not found for Document " + pdocument.getDocument().getName() + "! Try uploading the PDF for this product!";
logger.error(message);
throw new FileNotFoundException(message);
} catch (IOException e) {
String message = "Error while reading input file for document " + pdocument.getDocument().getName();
logger.error(message);
throw new IOException(message); }
if(ximage.getWidth()>ximage.getHeight()){
AffineTransform at = new AffineTransform(pdpage.getMediaBox().getWidth(), 0, 0, pdpage.getMediaBox().getHeight(), pdpage.getMediaBox().getWidth(), 0);
at.rotate(Math.toRadians(90));
contentStream.drawXObject(ximage,at);
}
else{
AffineTransform at = new AffineTransform(pdpage.getMediaBox().getWidth(), 0, 0, pdpage.getMediaBox().getHeight(), 0, 0);
contentStream.drawXObject(ximage,at);
}
PDFont font = PDType1Font.HELVETICA_BOLD;
//Pixel per Point
float ppp = page.getPpp();
Iterator<Field> cbIterator = pdocument.getCheckBoxMap().keySet().iterator();
while(cbIterator.hasNext()){
Field field = cbIterator.next();
if(pdocument.getCheckBoxMap().get(field)){
contentStream.beginText();
contentStream.setFont( font, 14 );
contentStream.moveTextPositionByAmount(field.getPosx()/ppp, field.getPosy()/ppp );
contentStream.drawString("x");
contentStream.endText();
}
}
BUT, when I use this in a EJB within the Glassfish Container I get the following errors, and the pages are blank:
[2015-05-05T01:57:59.739+0200] [glassfish 4.0] [INFO] [] [] [tid: _ThreadID=22 _ThreadName=Thread-3] [timeMillis: 1430783879739] [levelValue: 800] [[2015-05-05 01:57:59 DEBUG PDXObjectImage:398 - Colorspace can't be determined at this time, about to return NULL from unhandled branch. filter = COSName{DCTDecode}]]
[2015-05-05T01:57:59.740+0200] [glassfish 4.0] [INFO] [] [] [tid: _ThreadID=22 _ThreadName=Thread-3] [timeMillis: 1430783879740] [levelValue: 800] [[2015-05-05 01:57:59 DEBUG PDXObjectImage:400 - Can happen e.g. when constructing PDJpeg from ImageStream]]
Does anybody have any clue, why this is happening and how this can be solved?
Regards

Answer 1

My Problem was, that the PDFs I am generating seemed to be empty. All white. But the error mentioned in the topic has nothing to do with that. It seems that this is a kind of error nobody, that not really cares about the colorspace should care about. The error, why my Documents seemed empty was that I was not closing the ContentStream after finishing a page. So ContentStream#close solved the problem in my case.