bittorrent - issue at downloading torrents java -

i'm trying build java torrent downloader, based on ttorrent java library (link goes docs , basic instructions).

i followed instructions listed in javadoc , are. when running code, notthing appears happen. no exceptions either. , file not downloaded, can't see ".part" file in downloads folder. stays @ 0%.

this code far (compare code in docs).

 client client = new client(                       inetaddress.getlocalhost(),                       sharedtorrent.fromfile(                              new file(torrentpath),                              new file(mkpath)));               client.download();              client.waitforcompletion(); 

i didn't find better documentation of ttorrent one. doing wrong? , of course, torrent has seeds because downloaded before torrent manager.

update: although nothing downloaded, download process appears start throws following log message:

i know examples there aren't great, here 1 starter point you:

torrenttest.java

import jargs.gnu.cmdlineparser;  import java.io.file; import java.io.printstream; import java.net.inetaddress; import java.util.concurrent.timeunit;  import org.apache.log4j.basicconfigurator;  import com.turn.ttorrent.client.client; import com.turn.ttorrent.client.client.clientstate; import com.turn.ttorrent.client.sharedtorrent; public class torrenttest {      public static final string default_tracker_uri = "http://localhost:6969/announce";      /**      * display program usage on given {@link printstream}.      *       */     private static void usage(printstream s)      {         s.println("usage: simpleclient [options] torrent");         s.println("leech , seed torrent file.");         s.println();         s.println("available options:");         s.println(" -h,--help               show , exit.");         s.println(" -o,--output dir         output directory file.");         s.println();     }      /**      * main program function.      *       * @param args      */     public static void main(string[] args)      {         basicconfigurator.configure();          cmdlineparser parser = new cmdlineparser();         cmdlineparser.option = parser.addbooleanoption('h', "help");         cmdlineparser.option outputstring = parser.addstringoption('o', "output");          try {             parser.parse(args);         } catch (cmdlineparser.optionexception oe) {             system.err.println(oe.getmessage());             usage(system.err);             system.exit(1);         }             // display , exit if requested         if (boolean.true.equals((boolean)parser.getoptionvalue(help))) {             usage(system.out);             system.exit(0);         }          // options         file output = new file((string) parser.getoptionvalue(outputstring, "."));          // check it's correct usage         string[] otherargs = parser.getremainingargs();         if (otherargs.length != 1) {             usage(system.err);             system.exit(1);         }          // .torrent file path         file torrentpath = new file(otherargs[0]);          // start downloading file         try {             sharedtorrent torrent = sharedtorrent.fromfile(torrentpath, output);             system.out.println("starting client torrent: "+torrent.getname());             client client = new client(inetaddress.getlocalhost(), torrent);              try {                 system.out.println("start download: "+torrent.getname());                 client.share(); // seeding completion signal                 // client.download()    // done completion signal                  while (!clientstate.seeding.equals(client.getstate())) {                     // check if there's error                     if (clientstate.error.equals(client.getstate())) {                         throw new exception("ttorrent client error state");                     }                      // display statistics                     system.out.printf("%f %% - %d bytes downloaded - %d bytes uploaded\n", torrent.getcompletion(), torrent.getdownloaded(), torrent.getuploaded());                      // wait 1 second                     timeunit.seconds.sleep(1);                 }                  system.out.println("download completed.");             } catch (exception e) {                 system.err.println("an error occurs...");                 e.printstacktrace(system.err);             } {                 system.out.println("stop client.");                 client.stop();             }         } catch (exception e) {             system.err.println("an error occurs...");             e.printstacktrace(system.err);         }     } }