convert pem to jks (java keystore)

after letsencrypt finish we  must convert our keys to jks.
here is some instructions:

openssl pkcs12 -export -in server-cert.pem -inkey server-private.pem -out server.p12 -name localhost -CAfile ca.pem -caname root 

keytool -importkeystore -deststorepass passw12 -destkeypass passw12 -destkeystore server.jks -srckeystore server.p12 -srcstoretype PKCS12 -srcstorepass passw12 -alias localhost