Hi Ronald, Don't feel bad. We all started somewhere, some time ago. I've made plenty of mistakes myself.
The objective of my answer was to illuminate the problem. Error told you about line and null pointer exception. On that line, you had >File f = new File(pdfFile); So, you would need to check pdfFile, if it has been assigned a value or not. That is how one would go on debugging these errors. Usually, you just need to look in the stack trace for clues. Hope it helps, and good luck. Feel free to use all channels available to you. There are plenty of kind strangers willing to help. Don't let comments dissuade you from learning. Cheers Nasir - Nasir On Tue, Nov 10, 2015 at 10:17 PM, Tilman Hausherr <[email protected]> wrote: > Am 11.11.2015 um 06:37 schrieb Nasir Rasul: > >> Hi Ronald, >> >> You are declaring >> >>> private static final String pdfFile = null; >>> >> Subsequently, >> >>> File f = new File(pdfFile); >>> >> In between you need to initialize pdfFile with a value. At this point, >> pdfFile is null. It has never been assigned a value >> > > > do this: > > private static final String pdfFile = "C:/your > directory/name-of-your-file.pdf"; > > You are this guy, are you? > > https://stackoverflow.com/questions/33575548/pdfbox-image-rotation-from-90-to-0 > > I wrote a comment there... this is not to put you down. You should really > learn java basics first before starting with something as complex as PDF. > > Tilman > > > > >> Cheers >> Nasir >> >> >> - Nasir >> >> On Tue, Nov 10, 2015 at 6:27 PM, Ronald DERAMUS <[email protected]> >> wrote: >> >> Hi all, >>> I'm new to this list and to java. I was wondering if anyone has a good >>> working example of the rotate page feature? I haven't found a good >>> example >>> and I am trying to rotate a whole pdf page and save it.. I have the >>> following code but it doesn't seem to work... I'm having a hard time >>> getting rid of the NullPointer error. >>> >>> Here is my code: >>> >>> //import java.awt.List; >>> import java.util.List; >>> import java.io.File; >>> import java.io.FileInputStream; >>> import java.io.IOException; >>> >>> import org.apache.pdfbox.cos.COSDocument; >>> import org.apache.pdfbox.exceptions.COSVisitorException; >>> import org.apache.pdfbox.pdfparser.PDFParser; >>> import org.apache.pdfbox.pdmodel.PDDocument; >>> import org.apache.pdfbox.pdmodel.PDPage; >>> >>> >>> public class PdfRotator { >>> >>> >>> private static final String pdfFile = null; >>> >>> public static void main(String[] args) throws IOException { >>> >>> PDDocument document = PDDocument.load("PDFrotatorTEST.pdf"); >>> >>> >>> >>> //public static void main(String[] args) throws Exception { >>> >>> List pages = (List) document.getDocumentCatalog().getAllPages(); >>> >>> for (int i = 0; i < pages.size(); i++) { >>> PDPage page = (PDPage) ((java.util.List) pages).get(i);// >>> PDPage >>> page = (PDPage) pages.get(i); >>> if ((i + 1) % 2 == 0) { >>> page.setRotation(0); >>> } >>> } >>> >>> File f = new File(pdfFile);// File f = new File(pdfFile); >>> String newFile = f.getParent() + File.separator + "out.pdf"; >>> try { >>> document.save(newFile); >>> } catch (COSVisitorException e) { >>> // TODO Auto-generated catch block >>> e.printStackTrace(); >>> } >>> document.close(); >>> } >>> } >>> >>> Errors: >>> Exception in thread "main" java.lang.NullPointerException >>> at java.io.File.<init>(Unknown Source) >>> at PdfRotator.main(PdfRotator.java:36) >>> >>> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
