Importing private RSA key into java keystore
From VVCWiki
openssl pkcs12 -export -chain -in server.crt -inkey server.key \
-out server.p12 -name myserver \
-CAfile ca.crt
keytool -importkeystore -destkeystore server.jks \
-srckeystore server.p12 -srcstoretype PKCS12