A JNI error has occurred, please check your installation and try again in Eclipse x86 Windows 8.1

    public class LoginCumReg implements ActionListener,KeyListener {
        private JFrame form;
        private JTextField txtunm;
        private JTextField txtnm;
        private JTextField txteml;
        private JButton cmdcreate;
        private JPasswordField txtpass;
        private JPasswordField txtpassreg;
        private JButton cmdok;
        private JLabel lblunm;
        private JLabel lblpass;
        private JLabel lbleml;
        private JLabel lblpassreg;
        private JLabel lblnm;
        private JPanel panel_1;
    public LoginCumReg() {
        // construct components
        form = new JFrame("Sign Up");
        form.getContentPane().setFont(
                new Font("Plantagenet Cherokee", Font.BOLD, 18));
        txtunm = new JTextField(5);
        txtunm.addKeyListener(this);
        txtunm.setBounds(637, 55, 100, 25);
        txtnm = new JTextField(5);
        txtnm.setBounds(637, 228, 100, 25);
        txteml = new JTextField(5);
        txteml.setBounds(637, 264, 100, 25);
        cmdcreate = new JButton("Create Account");
        cmdcreate.setBounds(527, 350, 188, 25);
        txtpass = new JPasswordField(5);
        txtpass.setBounds(637, 91, 100, 25);
        txtpassreg = new JPasswordField(5);
        txtpassreg.setBounds(637, 300, 100, 25);
        cmdok = new JButton("OK");
        cmdok.setBounds(527, 139, 100, 25);
        lblunm = new JLabel("UserName");
        lblunm.setBounds(527, 55, 73, 25);
        lblpass = new JLabel("Password");
        lblpass.setBounds(527, 91, 100, 25);
        lbleml = new JLabel("Email ID");
        lbleml.setBounds(527, 264, 100, 25);
        lblpassreg = new JLabel("Password");
        lblpassreg.setBounds(527, 300, 100, 25);
        lblnm = new JLabel("Full Name");
        lblnm.setBounds(527, 228, 100, 25);

        // form.setResizable(false);

        // adjust size and set layout
        form.setPreferredSize(new Dimension(800, 450));

        form.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        form.getContentPane().setLayout(null);

        // add components
        form.getContentPane().add(txtunm);
        form.getContentPane().add(txtnm);
        form.getContentPane().add(txteml);
        form.getContentPane().add(cmdcreate);
        form.getContentPane().add(txtpass);
        form.getContentPane().add(txtpassreg);
        form.getContentPane().add(cmdok);
        form.getContentPane().add(lblunm);
        form.getContentPane().add(lblpass);
        form.getContentPane().add(lbleml);
        form.getContentPane().add(lblpassreg);
        form.getContentPane().add(lblnm);

        cmdcreate.setActionCommand("Create Account");
        cmdcreate.addActionListener(this);
        cmdok.setActionCommand("Login");

        JPanel panel = new JPanel();
        panel.setBounds(502, 29, 254, 154);
        panel.setFont(new Font("Palatino Linotype", Font.PLAIN, 14));
        panel.setBorder(new TitledBorder(new EtchedBorder(EtchedBorder.RAISED,
                null, null), "LOGIN", TitledBorder.LEADING, TitledBorder.TOP,
                null, null));
        panel.setBackground(SystemColor.controlHighlight);
        form.getContentPane().add(panel);

        panel_1 = new JPanel();
        panel_1.setBounds(500, 204, 254, 186);
        panel_1.setFont(new Font("Palatino Linotype", Font.PLAIN, 14));
        panel_1.setBorder(new TitledBorder(new EtchedBorder(
                EtchedBorder.RAISED, null, null), "SIGN UP",
                TitledBorder.LEADING, TitledBorder.TOP, null, null));
        panel_1.setBackground(SystemColor.controlHighlight);
        form.getContentPane().add(panel_1);

        JLabel lblNewLabel = new JLabel("New label");
        lblNewLabel.setBounds(91, 139, 286, 101);
        lblNewLabel.setIcon(new ImageIcon(
                "C:\Users\JAsh\Desktop\Projects\JAsh.png"));
        form.getContentPane().add(lblNewLabel);

        JPanel panel_2 = new JPanel();
        panel_2.setBounds(77, 118, 315, 145);
        panel_2.setBorder(new EtchedBorder(EtchedBorder.RAISED,
                SystemColor.activeCaptionBorder, SystemColor.menu));
        panel_2.setBackground(SystemColor.controlHighlight);
        form.getContentPane().add(panel_2);
        cmdok.addActionListener(this);

        form.setResizable(false);
        form.pack();
        form.setVisible(true);
        System.out.println("const..");
    }

    public static void main(String[] args) {
        new LoginCumReg();
    }

    @Override
    public void actionPerformed(ActionEvent ae) {
        // TODO Auto-generated method stub

        if (ae.getActionCommand().equals("Create Account")) {
            new Registration(txtnm.getText(), txteml.getText(), new String(
                    txtpassreg.getPassword()));
            form.setVisible(false);
        }

        if (ae.getActionCommand().equals("Login")) {
            try {
                if (txtunm.getText().equalsIgnoreCase("admin")
                        && new String(txtpass.getPassword()).equals("admin")) {
                    form.setVisible(false);
                    new Admin();
                } else {
                    DataBase db = new DataBase();
                    db.connect();
                    String sql = "SELECT * FROM LOGIN WHERE USERNAME='"
                            + txtunm.getText() + "'";
                    ResultSet rs = db.getDDL(sql);
                    boolean found = false;
                    while (rs.next()) {
                        if (rs.getString("Password").equals(
                                new String(txtpass.getPassword()))) {
                            found = true;
                            form.setVisible(false);
                            String name = rs.getString("FullName");
                            Session.startSession(txtunm.getText(), name);
                            new FacultyWelcome();
                        }
                    }
                    if (!found)
                        JOptionPane.showMessageDialog(new JFrame(),
                                "Invalid Credentials");
                    db.close();
                }
            } catch (Exception e) {
            }
        }

    }

    @Override
    public void keyPressed(KeyEvent arg0) {
        // TODO Auto-generated method stub
    }

    @Override
    public void keyReleased(KeyEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyTyped(KeyEvent arg0) {
        // TODO Auto-generated method stub
    //  JOptionPane.showMessageDialog(new JFrame(), arg0.getKeyChar()+"-"+arg0.getKeyCode());

    }
}

The above code works perfectly on my friend’s laptop and throws this error on my laptop. I have running the code on Eclipse Juno using Java 7. I have also tested and run a lot java programs on my laptop all works well. This is the only program which gives such an error. This is my final year project and I need it to work on my laptop, I will be greatful to anyone who helps

Answer

Short answer: Right-click on the class that contains the main method. Click on “Run As”. Click on “Java Application”. The keyboard shortcut is: Shift+Alt+X J (while holding Shift and Alt, press X; then release Shift and Alt and press J).

Long answer: To be honest, I am not 100% sure why this problem happens. It might be because of using a different jdk. I faced the same error. The solution was easier than I imagined. I was used to running my code using Ctrl + F11. But when I ran it as a java application (the way I described in “short answer”), the problem was resolved. I am not sure if it solves other people’s problems as well, but it is worthwhile to try. 🙂

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