in src/main/java/software/amazon/msk/auth/iam/internals/IAMSaslClient.java [210:222]
public SaslClient createSaslClient(String[] mechanisms,
String authorizationId,
String protocol,
String serverName,
Map<String, ?> props,
CallbackHandler cbh) throws SaslException {
String mechanismName = getMechanismNameForClassLoader(cbh.getClass().getClassLoader());
// Create a client by delegating to the SaslClientFactory for the classloader of the CallbackHandler
return Sasl.createSaslClient(
new String[] { mechanismName },
authorizationId, protocol, serverName, props, cbh);
}