Exit Code 1 when command line printing

Hi All,

  I write a program to issue following command line to print a PDF file.

     "C:\Program Files\Adobe\Acrobat 11.0\Acrobat\AcroRd32.exe" /t /n "My_file.pdf" <printer name>

  and use following statement to capture exception case.

       int exitVal = lAdobeProcess.waitFor();

        wdt.stop(); // stop the interrupt thread

        if ( exitVal != 0 ) {

          throw new Exception("[printPDF] Adobe Reader process exitVal : " + exitVal);

        }

  Sometimes, acrobat returns 1 as exit value but printing is successfully (most of times, it returns 0).

  Do anyone know why ?

  Is there any document for exit code value ?

  Many thanks.

Catatbochk