Yes, this command is coming in GlassFish v3 at JavaONE release. For now, you can just use
the keytool command.
e.g. JDK_HOME/bin/keytool -storepasswd -keystore <domain-folder>/config/keystore.jks -storepass "changeit" -new "changechangeit:)"
This is what change-master-password essentially does, for domains that use JKS.
HTH,
Kedar
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