password ?!

[jon80]

import java.util.*;
public class Main {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {

Scanner in = new Scanner(System.in);

System.out.println("Enter username:");
String username = in.nextLine();

System.out.println("Enter your password:");
char[] passwd = System.console().readPassword();
// ERROR:
// Exception in thread "main" java.lang.NullPointerException
// at javaapplication2.Main.main(Main.java:26),



}

}

[sanjeevtarar]

Hello,

There is no error in your program.....neither at compile time nor at run time...

Or you have not posted complete program..??
What is the problem or error ....

sanjeev

[jon80]

Java does not seem to agree with that statement, any idea why?

I'm using NetBeans 6.0.1 on Java 1.6, what are you using pls?

[sanjeevtarar]

Pal,

I just compiled your program onto console(Command Prompt) and It's working fine.

just try it at command prompt.

sanjeev

[CaptainMorgan]

Quote:

Originally Posted by jon80

Java does not seem to agree with that statement, any idea why?

I'm using NetBeans 6.0.1 on Java 1.6, what are you using pls?

The problem is that when you're running it from Netbeans - it's not using a Console. If you're on Windows or Linux, use a terminal to run the program and it will work, the below is run from my Linux system's terminal:

Quote:

-bash-3.20$ java Main
Enter username:
hello
Enter your password:

-bash-3.20$

It asked me for the password and once it accepted it terminated the program normally.

[sukatoa]

Use JCreator....

regards,
sukatoa

[JavaLovenJoe]

I would use the PasswordUtils if I were you:

Code:

import com.blogspot.joelnkode.tutorial.java.*;

public class CoolCode extends NewApplication {
	public void startHere() {
		String username = new InputUtils("Enter your username:");
		String password = new PasswordUtils("Enter your password:");
		ApplicationUtils.exit();
	}
}

[CaptainMorgan]

Quote:

Originally Posted by JavaLovenJoe

I would use the PasswordUtils if I were you:

Code:

import com.blogspot.joelnkode.tutorial.java.*;

public class CoolCode extends NewApplication {
    public void startHere() {
        String username = new InputUtils("Enter your username:");
        String password = new PasswordUtils("Enter your password:");
        ApplicationUtils.exit();
    }
}

Joe, your library use is not a standard- it's best to first start looking in the standard library's first- why use an external library if one is already provided for you in the default JDK?

[jon80]

Actually the code posted did not compile either, the "simplistic" version of the working code follows:

<code>
import java.util.*;
public class Password {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {

Scanner in = new Scanner(System.in);

System.out.println("Enter username:");
String username = in.nextLine();

System.out.println("Enter your password:");
char[] passwd = System.console().readPassword();

System.out.println("Username: " + username);
System.out.println("Password (encrypted): " + passwd.toString());
}
}
</code>

Any idea how the System.console.readPassword() method stores values (e.g. encryption standard)?

[sk.mahaboobbhasha@gmail.c]

hi

can any one help me in this.. i have a html/jsp form in that i have a field .. enter password... first time password will be stored in the databse... from second time when user enters passowrd wrongly for 3 times then it has to dispay some msg contact ur administrator. can any one send me this code? plzzzzzzzzzzzzzzzz send it ASAp

here is my code..

import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class Validation extends HttpServlet
{
private ServletConfig config;
public void init(ServletConfig config)throws ServletException
{
this.config=config;
}

public void service(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
{
String userName = request.getParameter("user");
String password = request.getParameter("pass");
PrintWriter out =response.getWriter();
HttpSession session = request.getSession();

boolean login(String userName, String password)
{
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con =DriverManager.getConnection("jdbc:mysql://localhost/basha","root","3ptec");
Statement s = con.createStatement();
String sql = "SELECT user FROM user" +
" WHERE user='" + user + "'" +
" AND Password='" + password + "'";
ResultSet rs = s.executeQuery(sql);
if (rs.next())
{
rs.close();
s.close();
con.close();
return true;
}
rs.close();
s.close();
con.close();
}

if(userName.equals(request.getParameter("user"))&& password.equals(request.getParameter("pass")))
{
out.println("<h1>User is Valid</h1>");
}
else
{
out.println("<h1>User is InValid</h1>");
}

if (!login(username, password) )
{
int count = Integer.parseInt( session.getAttribute("count") );
if (count > 3) {
response.sendRedirect("badbadUser.jsp");
}
else {
count++;
session.setAttribute("count");
response.sendRedirect("woopsWrongPasswordTryAgain. jsp");
}

catch (ClassNotFoundException e)
{
System.out.println(e.toString());
}
catch (SQLException e) {
System.out.println(e.toString());
}
catch (Exception e) {
System.out.println(e.toString());
}
return false;
}
}




}
}