Copying PDF seems to currupt it

Question

I am copying a pdf from a source directory, then attempting to extract the pdf with pdfbox 0.7.3
the code I am using to copy the file is
public static boolean altCopyFile( File source, File dest )
long len = 0;
boolean success = false;
FileChannel srcC = null;
FileChannel dstC = null;
try
  srcC = new FileInputStream( source ).getChannel();
  len = srcC.size();
  dstC = new FileOutputStream( dst ).getChannel();
  long offset = 0;
  while ( len > 0 )
   long count = dstC.transferFrom( srcC, offset, len );
   offset += count;
   len -= count;
  success = true;
catch ( IOException ioe )
}I also tryed
FileInputStream fis = new FileInputStream( source );
FileOutputStream fos = new FileOutputStream( dest );
byte[] buf = new byte[ 1024 ];
int count = 0;
while ( ( count = fis.read( buf ) ) != -1 )
fos.write( buf, 0, count );
...this indeed makes a copy of the file, but from this point onward, attempting to use PDFbox results in an error while extracting text, on either the original, or the copy. Does anyone see how this function could corrupt the source or destination pdf file?
as a side note both the source and destination pdf files are still viewable in any pdf viewer.

Answer 1

yes I am closing the channels,
the diff command shows a difference in the files
before and after the copy, what i can't understand is
how that code could be changing my source fileI do file copying all the time in much the same way as you have posted but I don't get this problem. Create a totally self contained example that illustrates your problem. If you don't solve your problem by writing this example (and people often do by taking this approach) then post it so others can help in diagnosing what you are doing wrong.