@Override
    public boolean abort() {
        if (loginState == LoginState.LOGGED_IN_NOT_COMMITTED) {
            log.debug("Login aborted");
            tokenRequiringCommit = null;
            extensionsRequiringCommit = null;
            loginState = LoginState.NOT_LOGGED_IN;
            return true;
        }
        log.debug("Nothing here to abort");
        return false;
    }
Attaches SASL extensions to the Subject
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/OAuthBearerLoginModule.java