[PDFBOX-4475] PDFMergerUtility is very slow, almost in dead loop

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.13, 2.0.14
• Fix Version/s: 2.0.15, 3.0.0 PDFBox
• Component/s: Utilities
• Labels: merge optimization
• Assignee: Tilman Hausherr
• Reporter: Derek Liu
• Created: 27/Feb/19 07:48
• Updated: 12/Apr/19 14:39
• Resolved: 27/Feb/19 16:41

Description

When use PDFMergerUtility to merge PDF file, it is very slow to merge the struct tree. It seems that it in a dead loop.

Test code:

package com.test;

import java.io.IOException;

import org.apache.pdfbox.multipdf.PDFMergerUtility;


public class TestMergeUtil {

  public static void main( String[] args ) throws IOException {
    PDFMergerUtility merger = new PDFMergerUtility();
    merger.addSource( "D:\\probe\\TourInventory_TourInventory_report.PDF" );
    merger.addSource( "D:\\probe\\TourInventory_TourInventory_report.PDF" );
    merger.setDestinationFileName( "D:\\probe\\TourInventory_TourInventory_report_merged.pdf" );
    merger.mergeDocuments();
  }
}

But after I comment bellow code, it can merge fast, but the merged PDF file size is very large.