[PDFBOX-5815] Can't split the document into individual pages

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 3.0.2 PDFBox
• Labels: Links java.lang.nullPointerException link split
• Flags: Important

Language

JAVA Java java

• Assignee: Unassigned
• Reporter: Nicolò Rossi
• Created: 06/May/24 15:28
• Updated: 06/May/24 15:43
• Resolved: 06/May/24 15:39

Description

If I try to split a document, containing links to internal pages, by single page, Splitter class throws NPE.

 

This is our code:

 

PDDocument pdfDocument = Loader.loadPDF(new File("path/to/file.pdf"));
List<PDDocument> splitted = splitter.split(pdfDocument); 

 

This the exception:

 

java.lang.NullPointerException: Cannot invoke "org.apache.pdfbox.pdmodel.PDPage.getCOSObject()" because the return value of "org.apache.pdfbox.pdmodel.interactive.documentnavigation.destination.PDPageDestination.getPage()" is null
    at org.apache.pdfbox.multipdf.Splitter.fixDestinations(Splitter.java:153)
    at org.apache.pdfbox.multipdf.Splitter.split(Splitter.java:136)

 

I search for the error and i see that it breaks in splitter class in 
fixDestinations method.
 
I report here the method definition:

private void fixDestinations(PDDocument destinationDocument)
{
    PDPageTree pageTree = destinationDocument.getPages();
    for (PDPageDestination pageDestination : destToFixSet)
    {
        COSDictionary srcPageDict = pageDestination.getPage().getCOSObject();
        COSDictionary dstPageDict = pageDictMap.get(srcPageDict);
        PDPage dstPage = new PDPage(dstPageDict);
        // Find whether destination is inside or outside
        if (pageTree.indexOf(dstPage) >= 0)
        {
            pageDestination.setPage(dstPage);
        }
        else
        {
            pageDestination.setPage(null);
        }
    }
} 

What's the problem:

pageDestination.getPage() returns null because the document contains links to internal pages, so splitting by page there is no more valid page to link in the result splitted document.

 

Possible solution:

check the page returned and if null set pageDestination to null, I could suggest something like this:

 

private void fixDestinations(PDDocument destinationDocument)
{
    PDPageTree pageTree = destinationDocument.getPages();
    for (PDPageDestination pageDestination : destToFixSet)
    {
        PDPage srcPage = pageDestination.getPage();
        if (srcPage != null){
            COSDictionary srcPageDict = srcPage.getCOSObject();
            COSDictionary dstPageDict = pageDictMap.get(srcPageDict);
            PDPage dstPage = new PDPage(dstPageDict);
            // Find whether destination is inside or outside
            if (pageTree.indexOf(dstPage) >= 0)
            {
                pageDestination.setPage(dstPage);
            }
            else
            {
                pageDestination.setPage(null);
            }
        }
        else
        {
            pageDestination.setPage(null);
        }
    }
} 

 

I've attached example file, thanks.

 

Issue Links

• duplicates: PDFBOX-5792 Regression NPE in Splitter
• is caused by: PDFBOX-5762 When splitting, keep page destinations that are part of target document(s)