}
@Override
protected STSClient createWSTrustClient(final STSClientConfig config) {
return STSClientFactory.getInstance(maxClientsInPool).create(initialNumberOfClients, new STSClientCreationCallBack() {
@Override
public STSClient createClient() {
String binaryTokenKey = (String) options.get(MapBasedTokenHandler.SYS_PROP_TOKEN_KEY);
if (binaryTokenKey == null) {