Java Cheat Sheet

These are just a few entries for some java related incantations I use once or twice a year and then promptly forget.

Here are a few entries for some java related incantations I use once or twice a year and then promptly forget.

Keytool

keytool -import -alias certAlias -file certFile.cer -keystore appCerts.store
Code language: Bash (bash)

The command above adds a cert “certFile.cer” to your keystore “appCerts.store”. You will be asked for the passphrase to appCerts.store. It is “changeit” if you have not changed it.

There are many ways to get the cert that you need. If you are just trying to get your server to call a secure website, on Windows you can extract the cert by clicking on the lock icon to the left of the URL bar, and following the steps, choosing “Base-64 encoded X.509 (.CER) as the format.

keytool -list -v -keystore keystoreName.jks | grep 'superCert-'
Code language: Bash (bash)

List the aliases in a java keystore that start with a specific string.

keytool -list -v -keystore keystoreName.jks -alias "certAlias (mustUseQuotesIfAliasHasParens)"
Code language: Bash (bash)

Print out info about a cert in a Java keystore.

keytool -delete -v -keystore ./path/to/file.jks -alias "alias name"
Code language: Bash (bash)

Delete a cert from the keystore whose alias is “alias name”

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