After I convert JAR file to EXE, program throws exception-Collection of common programming errors

i have .java file. It runs perfectly. I convert it to .jar file. Then i try to convert it to .exe file using program named “exe4j”, and successfully converted. But, when i open this .exe file there is an error message:

java.util.NoSuchElementException
     at java.util.Scanner.throwFor(Unknown Source)
     at java.util.Scanner.next(Unknown Source)
     at penghitung.persentase(programguru.java:27)
     at programguru.main(programguru.java:361)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
     at com.exe4j.runtime.WinLauncher.main(Unknown Source)

What is the meaning? I’m confused because the .java file runs perfectly.

Here is my code:

import java.util.*;
import java.io.*;

class penghitung
{
Scanner input = new Scanner(System.in);
int banyak, nilai, jumlah1, jumlah2, jumlah3, jumlah4, a, b, c, d, e, f, aa, bb, cc, dd, rata7;
long pengetahuan;
double numerik, rata1, rata2, rata3, rata4, rata5, rata6;
String pers, absen, predikat, prak, coba;

public void persentase()
{
    System.out.print("\n           *************************************");
    System.out.print("\n           ************START PROGRAM************");
    System.out.print("\n           *************************************");

    System.out.print("\n\nDEFAULT : ");
    System.out.print("\n  Tugas Sekolah  : 10 %");
    System.out.print("\n  Tugas Rumah    : 10 %");
    System.out.print("\n  Ulangan Harian : 20 %");
    System.out.print("\n  UTS            : 25 %");
    System.out.print("\n  UAS            : 30 %");
    System.out.print("\n  Keaktifan      : 5%");

    System.out.print("\n\nApakah anda ingin mengganti persentase tiap kategori? (Y/T) : ");
    pers = input.next();

    a = 10;
    b = 10;
    c = 20;
    d = 25;
    e = 30;
    f = 5;

    if (pers.equals("Y") || pers.equals("y"))
    {
        System.out.print("\n(Dalam persen)");
        System.out.print("\n  Tugas Sekolah  : ");
        a = Integer.parseInt(input.next());
        System.out.print("  Tugas Rumah    : ");
        b = Integer.parseInt(input.next());
        System.out.print("  Ulangan Harian : ");
        c = Integer.parseInt(input.next());
        System.out.print("  UTS            : ");
        d = Integer.parseInt(input.next());
        System.out.print("  UAS            : ");
        e = Integer.parseInt(input.next());
        System.out.print("  Keaktifan      : ");
        f = Integer.parseInt(input.next()); 
    }

    System.out.print("\nBanyak nilai Tugas Sekolah  : ");
    aa = Integer.parseInt(input.next());
    System.out.print("Banyak nilai Tugas Rumah    : ");
    bb = Integer.parseInt(input.next());
    System.out.print("Banyak nilai Ulangan Harian : ");
    cc = Integer.parseInt(input.next());

    System.out.print("\nApakah ada nilai Praktikum? (Y/T) : ");
    prak = input.next();
    if (prak.equals("Y") || prak.equals("y"))
    {   System.out.print("Banyak nilai Praktikum : ");
        dd = Integer.parseInt(input.next());
    }
}   

public void absen()
{
    System.out.print("\n----------------------------------------------------------------");
    System.out.print("\nNomor absen murid : ");
    absen = input.next();
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("\r\n#################### NOMOR ABSEN MURID : "+ absen + "\r\n");
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    }
}

public void tugasSekolah()
{
    System.out.print("\nTUGAS SEKOLAH\n");
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("\r\nTUGAS SEKOLAH\r\n");

        for (int i = 1; i  75)
    {
        predikat = "TINGGI";
    } else if(pengetahuan == 75)
    {
        predikat = "SEDANG";
    } else
    {
        predikat = "KURANG";
    }
    System.out.print("\n***PREDIKAT***          : " +predikat);
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("\r\n>>> PREDIKAT : " +predikat+ "\r\n");
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}

public void menu()
{
    System.out.print("\n\nTambah lagi? (Y/T) : ");
    coba = input.next();

    if (coba.equals("Y") || coba.equals("y"))
    {
        absen();
        tugasSekolah();
        tugasRumah();
        ulanganHarian();
        uts();
        uas();
        keaktifan();
        praktikum();
        pengetahuan();
        predikat();
        menu();
    }
    else 
    {
        System.out.print("\n           **************************************");
        System.out.print("\n           *************EXIT PROGRAM*************");
        System.out.print("\n           **************************************");
    }
}
}


public class programguru
{
public static void main (String args[])
{       
    penghitung penghitungku = new penghitung();

    //PERSENTASE NILAI
    penghitungku.persentase();

    //NOMOR ABSEN
    penghitungku.absen();

    //NILAI TUGAS SEKOLAH
    penghitungku.tugasSekolah();

    //NILAI TUGAS RUMAH
    penghitungku.tugasRumah();

    //NILAI ULANGAN HARIAN
    penghitungku.ulanganHarian();

    //NILAI UTS
    penghitungku.uts();

    //NILAI UAS
    penghitungku.uas();

    //NILAI KEAKTIFAN
    penghitungku.keaktifan();

    //NILAI PRAKTIKUM
    penghitungku.praktikum();

    //NILAI PENGETAHUAN
    penghitungku.pengetahuan();

    //PREDIKAT
    penghitungku.predikat();

    //MENU TAMBAH
    penghitungku.menu();
}
}

1. Just guessing here, since there is incomplete information: the error message indicates that you have an error about where you first do an “input.next();” in addition to indicating that there is “no such element”. If you are on Windows, and you are starting this executable by double-clicking an icon in a folder, then you have to figure out where “System.in” will come from. Windows will not automatically open up a command window for you to type input; if you want that, you have to run it a different way.