Getting NULLPointerException while merging pdf files using PDFDocMerger

Question

Hi,
I am using BI Publisher 11.1.1.7 Version Jar Files to use PDFDocMerger Class in Jdeveloper and my requirement is,
need to merge pdf files taking from the third party server.So, I am passing url as an input to PDFDocMerger(As per BIP documentation we can pass url as an input to PDFDocMerger using Object Class) but I am getting NULLPointerException.
I am using below code:
import java.io.File;
import java.io.FileOutputStream;
import oracle.xdo.common.pdf.util.PDFDocMerger;
public class PDFMerger
public PDFMerger() {
     public void pdfDocumentMerger() {
try {
System.out.println("Testing1");
                  Object[] f = new Object[2];
            f[0]= ("http://docs.mytxi.com/downloads/Invoices/OE/06082013/02599553.PDF");
            f[1]= ("http://docs.mytxi.com/downloads/Invoices/OE/06082013/02599553.PDF");
            FileOutputStream output;
            output = new FileOutputStream("c:\\docs\\OutputPDF.pdf");
     System.out.println("Testing3" + f[0]);
            PDFDocMerger pdfMerger;
            pdfMerger = new PDFDocMerger(f, output);
     System.out.println("Testing4");
      pdfMerger.process();
     System.out.println("Testing5");
pdfMerger = null;
output.close();
     }//try
      catch (Exception e)
      System.out.println(" Exception " + e.getMessage()) ;
      e.printStackTrace() ;
      System.out.println("End") ;
   public static void main(String[] argv) {
PDFMerger xmlPublisher;
xmlPublisher = new PDFMerger();
xmlPublisher.pdfDocumentMerger();
Error:
Testing1
Testing3http://docs.mytxi.com/downloads/Invoices/OE/06082013/02599553.PDF
Testing4
Jul 22, 2013 10:22:22 PM oracle.xdo.common.pdf.util.PDFDocMerger$PDFUtility <init>
SEVERE: The first input to be merged has problem and caused stopping merging
Jul 22, 2013 10:22:22 PM oracle.xdo.common.log.Logger log
WARNING: java.lang.NullPointerException
at oracle.xdo.template.pdf.util.PDFObjectDictionary.<init>(PDFObjectDictionary.java:36)
at oracle.xdo.common.pdf.util.PDFDocMerger$PDFUtility.checkIfDupFields(PDFDocMerger.java:2438)
at oracle.xdo.common.pdf.util.PDFDocMerger$PDFUtility.processWithNoOut(PDFDocMerger.java:2932)
at oracle.xdo.common.pdf.util.PDFDocMerger.generateMergedPDF(PDFDocMerger.java:623)
at oracle.xdo.common.pdf.util.PDFDocMerger.mergeDocs(PDFDocMerger.java:551)
at oracle.xdo.common.pdf.util.PDFDocMerger.process(PDFDocMerger.java:506)
at xxtxi.oracle.apps.ar.iex.server.PDFMerger.pdfDocumentMerger(PDFMerger.java:24)
at xxtxi.oracle.apps.ar.iex.server.PDFMerger.main(PDFMerger.java:40)
Exception java.lang.Exception: Document #2 looks corrupted.
oracle.xdo.XDOException: java.lang.Exception: Document #2 looks corrupted.
at oracle.xdo.common.pdf.util.PDFDocMerger.process(PDFDocMerger.java:510)
at xxtxi.oracle.apps.ar.iex.server.PDFMerger.pdfDocumentMerger(PDFMerger.java:24)
at xxtxi.oracle.apps.ar.iex.server.PDFMerger.main(PDFMerger.java:40)
End
Process exited with exit code 0.
It would be great, if any one provide solution on this issue.
Thanks,
Irfan.

Answer 1

One of the merged PDF was edited by using the "Adobe Lifecycle Assembler" tool and i was able to open that file successfully in my machine.
Is bi publisher API compatible with such files?
It would be great, if any one can throw some light on this issue.
Thanks,
Indira