Issue #3279917 by plach, cmlara: LogicException: The database connection is not serializable

  protected $connection;

  /**

   * The Honeypot logger channel.

   * The Honeypot logger channel factory.

   *

   * @var \Drupal\Core\Logger\LoggerChannelInterface

   * @var \Drupal\Core\Logger\LoggerChannelFactoryInterface

   */

  protected $logger;

  protected $loggerFactory;

  /**

   * The datetime.time service.

    $this->keyValue = $key_value->get('honeypot_time_restriction');

    $this->killSwitch = $kill_switch;

    $this->connection = $connection;

    $this->logger = $logger_factory->get('honeypot');

    $this->loggerFactory = $logger_factory;

    $this->timeService = $time_service;

    $this->stringTranslation = $string_translation;

    $this->cacheBackend = $cache_backend;

        '%form'  => $form_id,

        '@cause' => ($type == 'honeypot') ? $this->t('submission of a value in the honeypot field') : $this->t('submission of the form in less than minimum required time'),

      ];

      $this->logger->notice('Blocked submission of %form due to @cause.', $variables);

      $this->loggerFactory->get('honeypot')

        ->notice('Blocked submission of %form due to @cause.', $variables);

    }

  }

<?php

namespace Drupal\Tests\honeypot\FunctionalJavascript;

use Drupal\Tests\file\FunctionalJavascript\FileFieldWidgetTest;

/**

 * Tests the file field widget with the Honeypot module enabled.

 *

 * @group honeypot

 */

class HoneypotFileFieldTest extends FileFieldWidgetTest {

  /**

   * {@inheritdoc}

   */

  protected static $modules = [

    'honeypot',

    'node',

    'file',

    'file_module_test',

    'field_ui',

  ];

  /**

   * {@inheritdoc}

   */

  protected function setUp(): void {

    parent::setUp();

    // Set up required Honeypot configuration.

    $honeypot_config = \Drupal::configFactory()->getEditable('honeypot.settings');

    $honeypot_config->set('element_name', 'url');

    // Disable time_limit protection.

    $honeypot_config->set('time_limit', 0);

    // Test protecting all forms.

    $honeypot_config->set('protect_all_forms', TRUE);

    $honeypot_config->set('log', FALSE);

    $honeypot_config->save();

  }

}