Export Private Key from Java KeyStore

keytool -importkeystore -srckeystore jes.jmetrics.com.keystore -srcstoretype jks -destkeystore jes.jmetrics.com.p12 -deststoretype PKCS12 -srcalias jes.jmetrics.com
openssl pkcs12 -in jes.jmetrics.com.p12 -nocerts -nodes

Now, we can copy and paste the private key on the screen into the PEM file.