Merge PDF files in java

Hi,
I am having several pdf files in a directory and want to merge them all into one pdf. The problem is, I want a java programm having it done for me automatical.
If anyone has ever done something like this, could you give me sample java code?
Millions thanks in advance1

Try iText PDF library
http://www.lowagie.com/iText/tutorial/ch13.html#tools

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Getting NULLPointerException while merging pdf files using PDFDocMerger

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.

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.
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File>Create PDF>From File.
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import java.io.*;
import java.util.*;
import java.lang.*;
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set the page orientation, compression level and page size.
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pdfMerge.AppendEmptyPage();
pdfMerge.AppendHTMLFile(htmlFilePath);
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Thank You,
Madhav

Hi Madhav,
I think instead of going with JAVA mapping you can write a custom adapter module for it.
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Do you want to create PDF files using Java? If so, there is a library available at http://www.lowagie.com/iText/docs.html Check out this site. There are many more similar PDFGEnerator tools that you can use..

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