Keytool Error: Java. Lang. Exception: Alias Does Not Exist

For Ubuntu / Linux
List all entries from your keystore with the respective alias

keytool -list -v -keystore "myKeyStore.jks" -storepass myPassword

The verbose option '-v' is important, in order to see the aliases

Example output:

Keystore type: PKCS12
Keystore provider: SUN

Your keystore contains 2 entries

Alias name: 1
Creation date: Dec 4, 2019
Entry type: PrivateKeyEntry
Certificate chain length: 2
Certificate[1]:
Owner: CN=yourname.com, O=Your Name, C=XX
Issuer: CN=Issuer CA, O=Issuer Name, C=XX
Serial number: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Valid from: Mon Feb 25 10:04:56 GMT 2019 until: Wed Feb 24 10:04:56 GMT 2021
Certificate fingerprints:
   SHA1: 9F:35:31:B1:A9:C2:37:8D:61:2F:9B:ED:82:3F:45:26:E1:D9:18:83
   SHA256: 34:65:C8:B6:4D:24:9D:20:3C:24:7B:B7:7B:F5:6B:F3:BE:79:11:BE:4F:8C:21:D2:9E:86:CC:AD:17:84:01:C4                                                        
Signature algorithm name: SHA256withRSA
Subject Public Key Algorithm: 2048-bit RSA key
Version: 3
Extensions:  
...                                    

Check if the alias exists. You can list all entries using:

keytool -list -keystore "C:\Program Files\Java\jdk1.7.0_79\jre\lib\cacerts" -storepass changeit

This command will show all existing aliases in the file. If it's not there, that's why you can't delete it.

In sometimes you may get this error even the alias present in the keystore. Which may be you are not given the alias name properly while passing as arguments.

Ex : letsencryptisrgx1 [jdk]

In the above alias name you can see the square brackets which is the issue in my case.

When I give the entire name in double quotes it works.

 $JAVA_HOME/bin/keytool -list -v -alias "letsencryptisrgx1 [jdk]" -keystore $JAVA_HOME/lib/security/cacerts