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 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) >
