"java.security.UnrecoverableKeyException: requested entry requires a password" after creating SAML keystore
When using OpenJDK 11, you may find that the method for creating a SAML keystore described in Set up a SAML2 keystore does not work because the key being generated is not protected by a password - trying to log in via SAML will give you an unspecified error, and the server.log file will contain the error message "java.security.UnrecoverableKeyException: requested entry requires a password".