PASSING GRADE DATABASE

SOURCE CODE  :


/*
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 * and open the template in the editor.
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package latihan3;

import java.awt.EventQueue;
import java.beans.Beans;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.RollbackException;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 *
 * @author user
 */
public class passinggrade extends JPanel {
   
    public passinggrade() {
        initComponents();
        if (!Beans.isDesignTime()) {
            entityManager.getTransaction().begin();
        }
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                        
    private void initComponents() {
        bindingGroup = new org.jdesktop.beansbinding.BindingGroup();

        entityManager = java.beans.Beans.isDesignTime() ? null : javax.persistence.Persistence.createEntityManagerFactory("passinggrade_161011700392?zeroDateTimeBehavior=convertToNullPU").createEntityManager();
        query = java.beans.Beans.isDesignTime() ? null : entityManager.createQuery("SELECT p FROM Passinggrade_1 p");
        list = java.beans.Beans.isDesignTime() ? java.util.Collections.emptyList() : org.jdesktop.observablecollections.ObservableCollections.observableList(query.getResultList());
        masterScrollPane = new javax.swing.JScrollPane();
        masterTable = new javax.swing.JTable();
        idLabel = new javax.swing.JLabel();
        namaCalonPegawaiLabel = new javax.swing.JLabel();
        materiTestLabel = new javax.swing.JLabel();
        nilaiBenarLabel = new javax.swing.JLabel();
        nilaiSalahLabel = new javax.swing.JLabel();
        nilaiKosongLabel = new javax.swing.JLabel();
        jumlahNilaiLabel = new javax.swing.JLabel();
        passingGradeLabel = new javax.swing.JLabel();
        idField = new javax.swing.JTextField();
        namaCalonPegawaiField = new javax.swing.JTextField();
        materiTestField = new javax.swing.JTextField();
        nilaiBenarField = new javax.swing.JTextField();
        nilaiSalahField = new javax.swing.JTextField();
        nilaiKosongField = new javax.swing.JTextField();
        jumlahNilaiField = new javax.swing.JTextField();
        passingGradeField = new javax.swing.JTextField();
        saveButton = new javax.swing.JButton();
        refreshButton = new javax.swing.JButton();
        newButton = new javax.swing.JButton();
        deleteButton = new javax.swing.JButton();
        jButton1 = new javax.swing.JButton();

        FormListener formListener = new FormListener();

        org.jdesktop.swingbinding.JTableBinding jTableBinding = org.jdesktop.swingbinding.SwingBindings.createJTableBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, list, masterTable);
        org.jdesktop.swingbinding.JTableBinding.ColumnBinding columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${id}"));
        columnBinding.setColumnName("Id");
        columnBinding.setColumnClass(Integer.class);
        columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${namaCalonPegawai}"));
        columnBinding.setColumnName("Nama Calon Pegawai");
        columnBinding.setColumnClass(String.class);
        columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${materiTest}"));
        columnBinding.setColumnName("Materi Test");
        columnBinding.setColumnClass(String.class);
        columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${nilaiBenar}"));
        columnBinding.setColumnName("Nilai Benar");
        columnBinding.setCol