I have created a secret for my JKS file under volume mount /etc/secrets/keystore. I am accessing my JKS file path as an environment variable where ssl.keystore.location gets resolved as file:///etc/secrets/keystore/ssl.jks. But I get exception from SSL engine builder that modification time of keystore couldn't be found and java.nio.file.NoSuchFile Exception file:/etc/secrets/keystore/ssl.jks
Remove the file://. The keystore is opened by the Kafka client, not Spring.
Kafka knows nothing about Spring's Resource abstraction; you need to provide just the path to the file (relative or absolute).