abt java
1 Answer(s)      6 years and 7 months ago
Posted in : Java Beginners
i m new to this language
i have some problem with my java code ... i working on netbeans ..
i write a code for user authetication ... in this code it take user name password and a user certificate(which is given by master ) the problem is this that when i run this desktop application on netbeans its works but when i run this by commmand prompt or by double clickin on jar file it gives wrong out put and says certificate is tempered ..
i found out that when it reads that file by executing in netbeans it reads its correctly but when i run this program by command prompt the file contents change ...
i dnt know why ... plz help


View Answers

August 6, 2010 at 12:43 PM

Hi Friend,

It seems that you haven't set the Path variable in Environment Variables. Anyways we are sending you the Login Code in swings.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
class LoginDemo extends JFrame{
JPanel panel;
JLabel label1,label2;
final JTextField text1;
final JPasswordField text2;
label1 = new JLabel();
text1 = new JTextField(15);
label2 = new JLabel();
text2 = new JPasswordField(15);
SUBMIT=new JButton("Login");
panel=new JPanel(new GridLayout(4,2));
SUBMIT.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
String value1=text1.getText();
String value2=text2.getText();
String user1="";
String pass1="";
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test";, "root", "root");
Statement st = con.createStatement();
ResultSet res = st.executeQuery("SELECT * FROM login where username='"+value1+"' && password='"+value2+"'");
while ( {
user1 = res.getString("username");
pass1 = res.getString("password");
if (value1.equals(user1) && value2.equals(pass1)) {
JOptionPane.showMessageDialog(null,"Incorrect login or password","Error",JOptionPane.ERROR_MESSAGE);
catch(Exception e){
public static void main(String arg[]) {
LoginDemo frame=new LoginDemo();


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