Java Authenticator getPasswordAuthentication() Method

Last Updated : 17 Mar 2025

The getPasswordAuthentication() method of Authenticator class is called when password authorization is needed. The subclasses must override the default implementation, of getPasswordAuthentication() which returns null.

Syntax:

Parameter:

No parameter is passed.

Return:

The Password Authentication collected from the user, or null if none is provided.

Throw:

Does not throw any Exception

Example 1

import java.util.concurrent.BlockingQueue;      
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.URL;
      
      public class AuthenticatorgetPasswordAuthenticationExample1{
	       public static void main(String[] args) {
	        try {
                    passwordvalidator obj = new passwordvalidator();
	            Authenticator.setDefault(new passwordvalidator());
             URL url = new URL("https://www.javatpoint.com");

                    // calling password validator
                     obj.getPasswordAuthentication();
	            BufferedReader inb = new BufferedReader(new InputStreamReader(url.openStream()));
                    String line;
	            while ((line = inb.readLine()) != null) {
	               System.out.println(line);
	            }

                   inb.close();
	        }

	        catch (MalformedURLException e) {
	            System.out.println("Malformed URL: " + e.getMessage());
	        }
	        catch (IOException e) {
	            System.out.println("I/O Error: " + e.getMessage());
	        }
	    }
               
     public static class PasswordValidator extends Authenticator {

                    @Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                     System.out.println(" password validating...");
	            String username = "javaTpoint";
	            String password = "12345";
	            return new PasswordAuthentication(username, password.toCharArray());
        }
	             }    }	

Output:

password validating...

Example 2

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.InetAddress;
import java.net.PasswordAuthentication;
import java.net.URL;
public class AuthenticatorgetPasswordAuthenticationExample2 {
  public static void main(String[] argv) throws Exception {
       passwordvalidator obj = new passwordvalidator();
    Authenticator.setDefault(new passwordvalidator());
    URL url = new URL("https://www.javaTpoint.com");

     obj.getPasswordAuthentication();
    BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
    String str;
    while ((str = in.readLine()) != null) {
      System.out.println(str);
    }
    in.close();
  }
}
class Passwordvalidator extends Authenticator {  

  protected PasswordAuthentication getPasswordAuthentication() {
      // return null because we havent set the server
    String promptString = this.getRequestingPrompt();
    System.out.println(promptString);
    String hostname = this.getRequestingHost();
    System.out.println(hostname);

    String username = "name";
    String password = "password";
    return new PasswordAuthentication(username, password.toCharArray());
  }
}

Output:

null
null

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Java Authenticator getPasswordAuthentication() Method

Syntax:

Parameter:

Return:

Throw:

Example 1

Example 2

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