I'm using Java eclipse for my database but eventually I encounter error like this: JOptionPane: parentComponent does not have a valid parent I don't know what is the problem please somebody explain because I'm just 2nd year IT student and I want to learn more about Java I want to complete my Goals.
import java.awt.EventQueue;
import java.lang.*;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.sql.*;
import javax.swing.*;
public class Login {
Connection connection = null;
private JFrame frame;
private JTextField username;
private JPasswordField password;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Login window = new Login();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Login() {
initialize();
connection = Database.dbconector();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
username = new JTextField();
username.setBounds(127, 55, 200, 50);
frame.getContentPane().add(username);
username.setColumns(10);
password = new JPasswordField();
password.setBounds(127, 125, 200, 50);
frame.getContentPane().add(password);
JButton btnLogin = new JButton("Log in");
btnLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
String query = "select * from bsit-db where Username=? and Password=?";
PreparedStatement pst = connection.prepareStatement(query);
pst.setString(1, username.getText());
pst.setString(2, password.getText());
ResultSet rs = pst.executeQuery();
int count = 0;
while (rs.next()) {
count = count + 1;
}
if (count == 1) {
JOptionPane.showInternalInputDialog(null, "Successfully Login to your account!");
} else {
JOptionPane.showInternalInputDialog(null, "Incorrect ID/Password. Please Try Again!");
}
rs.close();
pst.close();
} catch (Exception e1) {
JOptionPane.showInternalInputDialog(null, e1);
} finally {
try {
} catch (Exception e1) {
JOptionPane.showInternalInputDialog(null, e1);
}
}
}
});
btnLogin.setBounds(103, 202, 112, 37);
frame.getContentPane().add(btnLogin);
JButton btnClear = new JButton("clear");
btnClear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
username.setText(null);
password.setText(null);
}
});
btnClear.setBounds(237, 202, 112, 37);
frame.getContentPane().add(btnClear);
JLabel lblUsername = new JLabel("username");
lblUsername.setBounds(66, 55, 200, 50);
frame.getContentPane().add(lblUsername);
JLabel lblPassword = new JLabel("password");
lblPassword.setBounds(66, 125, 200, 50);
frame.getContentPane().add(lblPassword);
}
}
this is the console error
Sun Aug 06 20: 54: 43 CST 2017 WARN: Establishing SSL connection without server 's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn' t set.For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'.You need either to explicitly disable SSL by setting useSSL = false, or set useSSL = true and provide truststore for server certificate verification. java.lang.RuntimeException: JOptionPane: parentComponent does not have a valid parent at javax.swing.JOptionPane.createInternalFrame(Unknown Source) at javax.swing.JOptionPane.showInternalOptionDialog(Unknown Source) at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source) at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source) at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source) at Database.dbconector(Database.java: 19) at Login. < init > (Login.java: 44) at Login$1.run(Login.java: 29) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$500(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)
