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KeyStore deleteEntry() method in Java with Examples
  • Last Updated : 10 Jun, 2020

The deleteEntry(String alias) method of java.security.KeyStore class is used to remove the entry for requested alias name.

Syntax:

public final void deleteEntry(String alias)
  throws KeyStoreException

Parameter: This method seeks the name of the alias as a parameter of String type of which the entry is to be deleted.

Return Value: This method has nothing to return.

Exception: This method throws KeyStoreException if you don’t initialize this keystore.



Note: All the programs in this article won’t run on online IDE as no ‘privatekey’ Keystore exists. You can check this code on the Java compiler on your system. To check this code, create a Keystore ‘privatekey’ on your system and set your own keystore password to access that keystore.

Below are the examples to illustrate the deleteEntry() method:

Example 1:




// Java program to demonstrate
// getInstance() method
  
import java.security.*;
import java.security.cert.*;
import java.util.*;
import java.io.*;
  
public class GFG {
    public static void main(String[] argv)
    {
  
        try {
  
            // creating Enumeration<String> object
            // and initializing with null
            Enumeration<String> e = null;
  
            // creating the object of MessageDigest
            // and getting instance
            // By using getInstance() method
            KeyStore sr = KeyStore.getInstance("JKS");
  
            // keystore password is require to access keystore
            char[] pass = ("123456").toCharArray();
  
            // creating and initializing
            // object of InputStream
            InputStream is
                = new FileInputStream(
                    "f:/java/private key.store");
  
            // initializing keystore object
            sr.load(is, pass);
  
            // getting the list of aliases
            // using aliases() method
            e = sr.aliases();
  
            // display the result
            System.out.println("List of all the alias"
                               + " present before deletion");
            while (e.hasMoreElements()) {
                System.out.print(e.nextElement() + " ");
                System.out.println();
            }
  
            // delete the entry having alias name htttp
            // using deleteEntry method
            sr.deleteEntry("htttp");
  
            // getting the list of aliases
            // using aliases() method
            e = sr.aliases();
  
            // display the result
            System.out.println("\nList of all the alias"
                               + " present after deletion");
            while (e.hasMoreElements()) {
                System.out.print(e.nextElement() + " ");
                System.out.println();
            }
        }
  
        catch (NoSuchAlgorithmException e) {
  
            System.out.println("Exception thrown : " + e);
        }
        catch (NullPointerException e) {
  
            System.out.println("Exception thrown : " + e);
        }
        catch (KeyStoreException e) {
  
            System.out.println("Exception thrown : " + e);
        }
        catch (FileNotFoundException e) {
  
            System.out.println("Exception thrown : " + e);
        }
        catch (IOException e) {
  
            System.out.println("Exception thrown : " + e);
        }
        catch (CertificateException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}
Output:
List of all the alias present before deletion
ftpkey
htttp

List of all the alias present after deletion
ftpkey

Example 2: For




// Java program to demonstrate
// getInstance() method
  
import java.security.*;
import java.security.cert.*;
import java.util.*;
import java.io.*;
  
public class GFG {
    public static void main(String[] argv)
    {
  
        try {
  
            // creating Enumeration<String> object
            // and initializing with null
            Enumeration<String> e = null;
  
            // creating the object of MessageDigest
            // and getting instance
            // By using getInstance() method
            KeyStore sr = KeyStore.getInstance("JKS");
  
            // initializing keystore object
            // sr.load(is, pass);
  
            // getting the list of aliases
            // using aliases() method
            e = sr.aliases();
  
            // display the result
            System.out.println("List of all the alias "
                               + "present before deletion");
            while (e.hasMoreElements()) {
                System.out.print(e.nextElement() + " ");
                System.out.println();
            }
  
            // delete the entry having alias name htttp
            // using deleteEntry method
            sr.deleteEntry("htttp");
  
            // getting the list of aliases
            // using aliases() method
            e = sr.aliases();
  
            // display the result
            System.out.println("\nList of all the alias"
                               + " present after deletion");
            while (e.hasMoreElements()) {
                System.out.print(e.nextElement() + " ");
                System.out.println();
            }
        }
        catch (NullPointerException e) {
  
            System.out.println("Exception thrown : " + e);
        }
        catch (KeyStoreException e) {
  
            System.out.println("Exception thrown : " + e);
        }
    }
}
Output:
Exception thrown :
 java.security.KeyStoreException:
 Uninitialized keystore

Reference: https://docs.oracle.com/javase/9/docs/api/java/security/KeyStore.html#deleteEntry-java.lang.String-

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