There is a patently easy way to convert JKS keystores to PKCS12 certificate bundles (and vice versa). It’s a (poorly documented) keytool command that was introduced with JDK 6:
Convert JKS to P12
keytool -importkeystore -srckeystore keystore.jks -srcstoretype JKS -deststoretype PKCS12 -destkeystore keystore.p12
Convert P12 to JKS
keytool -importkeystore -srckeystore keystore.p12 -srcstoretype PKCS12 -deststoretype JKS -destkeystore keystore.jks