new PrivateKeyCallback.IssuerSerialNumRequest(
cert.getIssuerX500Principal(), cert.getSerialNumber());
PrivateKeyCallback pkCallback = new PrivateKeyCallback(request);
Callback[] callbacks = null;
if (this.useXWSSCallbacks) {
RuntimeProperties props = new RuntimeProperties(context);
callbacks = new Callback[] {props, pkCallback };
} else {
callbacks = new Callback[] { pkCallback };
}
_handler.handle(callbacks);