many Java system that run web server with SSL need JKS store type and not PKCS12 Type (PFX)
The easy Tool to Convert the Type is - Keytool.
Using JDK 1.6 or later you need to run this command :
keytool -importkeystore -srckeystore mypfxfile.pfx -srcstoretype pkcs12
-destkeystore clientcert.jks -deststoretype JKS
You will prompt to Enter Destination Keystore Password and Source Keystore Password.
SHMUEL H.