java - flush() does not flush on a Process OutputStream -

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i tried multiple ways that: printing process-outputstream 1 second delay after each "flush()". flush doesn't seem work it's supposed to. can tell me why? 1 combined string when "close()" being called. there won't printed before "close()" comes action.

context: should shut down minecraft server , run backup afterwards.

    bufferedwriter w = new bufferedwriter(new outputstreamwriter(process.getoutputstream())); w.write("say serverbackup begins in 3..."); w.flush(); thread.sleep(1000); w.write("say 2..."); w.flush(); thread.sleep(1000); w.write("say 1..."); w.flush(); thread.sleep(1000); w.write("say game over!!!!!!!!!!!!!..."); w.flush(); w.write("stop"); w.flush(); w.close(); process.waitfor(10, timeunit.seconds); //...

as sanket gupte answered, have add '\n' @ end of messages, since read process's input stream .readline() (i suppose), print if \n appears, regardless thread.sleep(..) calls. , flush works supposed to. writes buffer stream.

  • i suggest not problem process, since don't know

  • what running in background started bash , output via echo

    processbuilder processbuilder = new processbuilder("/bin/bash"); processbuilder.redirecterrorstream(true); try {     final process bash = processbuilder.start();     bufferedwriter bufferedwriter = new bufferedwriter(new outputstreamwriter(bash.getoutputstream()));      new thread(new runnable() {         public void run() {             bufferedreader bufferedreader = new bufferedreader(new inputstreamreader(bash.getinputstream()));             string line;             try {                 while ((line = bufferedreader.readline()) != null){                     system.out.println(line);                 }             } catch (ioexception e) {                 e.printstacktrace();             }         }     }).start();     bufferedwriter.write("echo serverbackup begins in 3...\n");     bufferedwriter.flush();     thread.sleep(2000);     bufferedwriter.write("echo 2\n");     bufferedwriter.close();  } catch (ioexception e) {     e.printstacktrace(); } catch (interruptedexception e) {     e.printstacktrace(); }

serverbackup begins in 3...

...(2 sec)

say 2


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