Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at LicenseForm.createLicense(LicenseForm.java:84)
	at LicenseForm.access$100(LicenseForm.java:8)
	at LicenseForm$1.actionPerformed(LicenseForm.java:25)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6533)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6298)
	at java.awt.Container.processEvent(Container.java:2236)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2294)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
	at java.awt.Container.dispatchEventImpl(Container.java:2280)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

import javafx.application.Application;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;

public class LicenseForm {

    private JPanel panel1;
    private JTextField textField1;
    private JButton createLicenseButton;
    private Connection con;

    private static LicenseForm licenseForm = new LicenseForm();

    public LicenseForm() {
        this.createLicenseButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                createLicense(textField1.getText().toString());
            }
        });
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("RigelLicense");
        frame.setContentPane(new LicenseForm().panel1);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setTitle("Rigel License");
        getLicenseForm().establishConnection();
        System.out.println(getLicenseForm());
    }

    public static LicenseForm getLicenseForm() {
        return licenseForm;
    }

    private void establishConnection() {
        if (!isConnected()) {
            try {
                con = DriverManager.getConnection("jdbc:mysql://" + host + ":" + port + "/" + db, username, password);
            } catch (SQLException e) {
            }
        }
    }

    /* Disconnection Method */
    private void disconnect() {
        if (isConnected()) {
            try {
                con.close();
            } catch (SQLException e) {

            }
        }
    }

    private boolean isConnected() {
        return con != null;
    }

    private boolean licenseEnabled(String license) {
        try {
            PreparedStatement ps = con.prepareStatement("SELECT enabled FROM licenses WHERE license = ?");
            ps.setString(1, license);
            ResultSet rs = ps.executeQuery();
            if (rs.next() && rs.getBoolean("true")) {
                return true;
            } else {
                return false;
            }
        } catch (SQLException e) {
            return false;
        }
    }

    private void createLicense(String license) {
        try {
            PreparedStatement ps = con.prepareStatement("INSERT IGNORE INTO licenses (enabled, license) VALUES (?, ?)");
            ps.setBoolean(1, true);
            ps.setString(2, license);
            ps.executeQuery();
            //NSERT IGNORE INTO accounts (PlayerName,uuid,rubies,gold) VALUES (?,?,?,?)
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}