The java keytool cannot import or export private keys. In particular it cannot handle PKCS12 files (although the J2EE version of keytool can). As a workaround, I downloaded PKCS12Import.java from the Jetty project. It can create a JKS keystore file from a PKCS12 file.
... until the collector arrives ...
This "blog" is really just a scratchpad of mine. There is not much of general interest here. Most of the content is scribbled down "live" as I discover things I want to remember. I rarely go back to correct mistakes in older entries. You have been warned :)