Java POI - Error: Unable to read entire header

readFirst512() will read the first 512 bytes of your Inputstream and throw an exception if there is not enough bytes to read. I think your file is not big enough to be read by POI.

It is probably not a correct Word file. Is it really only 162 bytes long? Check in your filesystem.

I'd recommend creating a new Word file using Word or LibreOffice, and then try to read it using your program.

you should try this programm. package file_opration;

import java.io.*;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.extractor.WordExtractor;

public class ReadDocFile {
public static void main(String[] args) {
File file = null;
WordExtractor extractor = null ;
try {

   file = new File("filepath location");
   FileInputStream fis=new FileInputStream(file.getAbsolutePath());
   HWPFDocument document=new HWPFDocument(fis);
   extractor = new WordExtractor(document);
   String [] fileData = extractor.getParagraphText();
   for(int i=0;i<fileData.length;i++){
     if(fileData[i] != null)
       System.out.println(fileData[i]);
   }
}
catch(Exception exep){}
  }
}

Ahh, you've got a file, then you're spending loads of memory buffering the whole thing into memory by hiding your file behind an InputStream... Don't! If you have a File, give that to POI. Only give POI an InputStream if that's all your have

Your code should be something like:

 NPOIFSFileSystem fs = new NPOIFSFileSystem(new File("myfile.doc"));
 HWPFDocument document = new HWPFDocument(fs.getRoot());

That'll be quicker and use less memory that reading it into an InputStream, and if there are problems with the file you should normally get slightly more helpful error messages out too

A 162 byte MS Word .doc is probably an "owner file". A temporary file that Word uses to signify the file is locked/owned.

They have a .doc file extension but they are not MS Word Docs.