#fixed code
                                @Override
    public String getConfig(String dataId, String defaultValue, long timeoutMills) {
        ConfigFuture configFuture = new ConfigFuture(dataId, defaultValue, ConfigFuture.ConfigOperation.GET, timeoutMills);
        consulNotifierExecutor.execute(() -> {
            complete(getConsulClient().getKVValue(dataId), configFuture);
        });
        return (String) configFuture.get();
    }
#vulnerable code 
                                @Override
    public String getConfig(String dataId, String defaultValue, long timeoutMills) {
        ConfigFuture configFuture = new ConfigFuture(dataId, defaultValue, ConfigFuture.ConfigOperation.GET, timeoutMills);
        consulConfigExecutor.execute(() -> {
            complete(getConsulClient().getKVValue(dataId), configFuture);
        });
        return (String) configFuture.get();
    } 
                            #location 4 
                            #vulnerability type THREAD_SAFETY_VIOLATION