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