SunPKCS11 : unable to reload nss-db in running jvm

I'm using SunPKCS11 to load and check certificates from a nssdb store:
KeyStore ks = KeyStore.getInstance("PKCS11", "SunPKCS11-nssdb");
ks.load(null, "".toCharArray());
This works fine, but eventhough the documentation of Keystore.load() method states "Note that if this keystore has already been loaded, it is reinitialized and loaded again from the given input stream.", but in a given JVM runtime, I cannot see changes in the nssdb, done by CLI outside the JVM, even calling this method again.
I found other questions reporting this issue, but no clear answer.
(note: running this on openJDK1.7, but openJDK1.6 shows the same behaviour)
Any comment is wellcome...

ther eis no MMC SAP snapin for Oracle.
Period.
Forget about it. SAP has never released it and I believe it doe not plan to do so neither.

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