console - How to call CMD to create GnuPG-Keypair from Java -

i'm trying execute gpg-command in java create new keypair, i'm not getting answer console. code works if try execute gpg-command version gpg --version or retrieve keylist gpg --list-key.

i'm using code stackoverflow-question:

public void getkeylist(){     try {          process gpgprocess = runtime.getruntime().exec("gpg --gen-key");          bufferedreader gpgoutput = new bufferedreader(new inputstreamreader(gpgprocess.getinputstream()));         bufferedwriter gpginput = new bufferedwriter(new outputstreamwriter(gpgprocess.getoutputstream()));         bufferedreader gpgerroroutput = new bufferedreader(new inputstreamreader(gpgprocess.geterrorstream()));          boolean executing = true;          while(executing){               try {                 int exitvalue = gpgprocess.exitvalue();                  if (gpgerroroutput.ready()){                     string error = getstreamtext(gpgerroroutput);                     system.err.println(error);                 }else if (gpgoutput.ready()){                     system.out.println(getstreamtext(gpgoutput));                  }             } catch (exception e){               //the process not yet ready exit.  take break , try again.                 try {                     thread.sleep(100);                 } catch (interruptedexception e1) {                     system.err.println("this thread has insomnia: " + e1.getmessage());                 }             }         }       } catch (ioexception e){         e.printstacktrace();     }  }  private string getstreamtext(bufferedreader reader) throws ioexception{     stringbuilder result = new stringbuilder();     try{         while(reader.ready()){             result.append(reader.readline());             if(reader.ready()){                 result.append("\n");             }         }     }catch(ioexception ioe){         system.err.println("error while reading stream: " + ioe.getmessage());         throw ioe;     }     return result.tostring(); } 

i've tried processbuilder instead of runtime, that's not solution. have idea on how solve problem, or totally impossible interact console during key-generation process?

gpg --genkey interactive call, waits input, never provide. 2 possible solutions:

1. use bouncycastle instead, native java library openpgp.

2. as implementing interactive gnupg session rather complicated , error-prone, might better use "experimental feature" batch key generation. man gpg:

   --gen-key       generate new key pair. command used       interactively.        there experimental feature allows create       keys  in  batch  mode.  see   file `doc/details' in       source distribution on how use this. 

   the file doc/details available online. section want called "unattended key generation". it's rather lengthy, didn't quote here, example document on how it:

   $ cat >foo <<eof      %echo generating basic openpgp key      key-type: dsa      key-length: 1024      subkey-type: elg-e      subkey-length: 1024      name-real: joe tester      name-comment: stupid passphrase      name-email: joe@foo.bar      expire-date: 0      passphrase: abc      %pubring foo.pub      %secring foo.sec      # commit here, can later print "done" :-)      %commit      %echo done eof $ gpg --batch --gen-key foo