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public class MediaPlayerThread extends Thread {    Process mediaplayer_process;    OutputStreamWriter out_to_mediaplayer;    String Clipname;    Clip Clipinfo = new Clip();            /** Creates a new instance of MediaPlayerThread */    public MediaPlayerThread() {    }            public void run() {        System.out.println("we are in run!");        String Clipname, Uploadername, Play_Command, Clipid;                Clipname = Clipinfo.getClipName();                 Play_Command="c:\\mplayer\\mplayer.exe -fs -slave -quiet " + Clipname;        System.out.println("Playcommand: " + Play_Command);                try {            mediaplayer_process = Runtime.getRuntime().exec( Play_Command );            System.out.println("executed");            BufferedReader in = new BufferedReader(new InputStreamReader( mediaplayer_process.getInputStream() ));            out_to_mediaplayer = new OutputStreamWriter(mediaplayer_process.getOutputStream());            mediaplayer_process.waitFor();                                } catch(Exception e) {            System.out.println(e.getMessage());        }    }....