diff --git a/application/Espo/Core/Application.php b/application/Espo/Core/Application.php
index 211dccb56e..a872d67ce5 100644
--- a/application/Espo/Core/Application.php
+++ b/application/Espo/Core/Application.php
@@ -30,7 +30,7 @@
 namespace Espo\Core;
 
 use Espo\Core\{
-    ContainerBuilder,
+    Container\ContainerBuilder,
     InjectableFactory,
     Container,
     ApplicationUser,
diff --git a/application/Espo/Core/Binding/DefaultBinding.php b/application/Espo/Core/Binding/DefaultBinding.php
index 5c4bdd7d7c..a238a8e9b4 100644
--- a/application/Espo/Core/Binding/DefaultBinding.php
+++ b/application/Espo/Core/Binding/DefaultBinding.php
@@ -43,6 +43,11 @@ class DefaultBinding
             'container'
         );
 
+        $binder->bindService(
+            'Espo\\Core\\Container\\Container',
+            'container'
+        );
+
         $binder->bindService(
             'Espo\\ORM\\EntityManager',
             'entityManager'
diff --git a/application/Espo/Core/Container.php b/application/Espo/Core/Container.php
index e41d06cff1..d1808f0252 100644
--- a/application/Espo/Core/Container.php
+++ b/application/Espo/Core/Container.php
@@ -30,20 +30,21 @@
 namespace Espo\Core;
 
 use Espo\Core\{
-    Exceptions\Error,
     InjectableFactory,
-    Loaders\Loader,
+    Container\Loader,
+    Container\Container as ContainerInterface,
     Binding\BindingContainer,
 };
 
 use ReflectionClass;
+use RuntimeException;
 
 /**
  * DI container for services. Lazy initialization is used. Services are instantiated only once.
  *
  * See https://docs.espocrm.com/development/di/.
  */
-class Container
+class Container implements ContainerInterface
 {
     private $data = [];
 
@@ -51,9 +52,9 @@ class Container
 
     private $loaderClassNames;
 
-    protected $configuration = null;
+    private $configuration = null;
 
-    protected $injectableFactory;
+    private $injectableFactory;
 
     public function __construct(
         string $configurationClassName,
@@ -65,7 +66,7 @@ class Container
 
         foreach ($services as $name => $service) {
             if (!is_string($name) || !is_object($service)) {
-                throw new Error("Container: Bad service passed.");
+                throw new RuntimeException("Container: Bad service passed.");
             }
 
             $this->setForced($name, $service);
@@ -80,6 +81,8 @@ class Container
 
     /**
      * Obtain a service object.
+     *
+     * @throws RuntimeException If not gettable.
      */
     public function get(string $name) : object
     {
@@ -87,7 +90,7 @@ class Container
             $this->load($name);
 
             if (!$this->isSet($name)) {
-                throw new Error("Could not load '{$name}' service.");
+                throw new RuntimeException("Could not load '{$name}' service.");
             }
         }
 
@@ -133,7 +136,7 @@ class Container
         return isset($this->data[$name]);
     }
 
-    private function initClass(string $name)
+    private function initClass(string $name) : void
     {
         if ($this->isSet($name)) {
             $object = $this->get($name);
@@ -165,7 +168,7 @@ class Container
             $loadMethod = $loaderClass->getMethod('load');
 
             if (!$loadMethod->hasReturnType()) {
-                throw new Error("Loader method for service '{$name}' does not have a return type.");
+                throw new RuntimeException("Loader method for service '{$name}' does not have a return type.");
             }
 
             $className = $loadMethod->getReturnType()->getName();
@@ -182,11 +185,13 @@ class Container
 
     /**
      * Get a class of a service.
+     *
+     * @throws RuntimeException If not gettable.
      */
     public function getClass(string $name) : ReflectionClass
     {
         if (!$this->has($name)) {
-            throw new Error("Service '{$name}' does not exist.");
+            throw new RuntimeException("Service '{$name}' does not exist.");
         }
 
         if (!isset($this->classCache[$name])) {
@@ -198,21 +203,23 @@ class Container
 
     /**
      * Set a service object. Must be configured as settable.
+     *
+     * @throws RuntimeException Is not settable or already set.
      */
     public function set(string $name, object $object) : void
     {
         if (!$this->configuration->isSettable($name)) {
-            throw new Error("Service '{$name}' is not settable.");
+            throw new RuntimeException("Service '{$name}' is not settable.");
         }
 
         if ($this->isSet($name)) {
-            throw new Error("Service '{$name}' is already set.");
+            throw new RuntimeException("Service '{$name}' is already set.");
         }
 
         $this->setForced($name, $object);
     }
 
-    protected function setForced(string $name, object $object)
+    protected function setForced(string $name, object $object) : void
     {
         $this->data[$name] = $object;
     }
@@ -254,7 +261,7 @@ class Container
         $className = $this->configuration->getServiceClassName($name);
 
         if (!$className || !class_exists($className)) {
-            throw new Error("Could not load '{$name}' service.");
+            throw new RuntimeException("Could not load '{$name}' service.");
         }
 
         $dependencyList = $this->configuration->getServiceDependencyList($name);
diff --git a/application/Espo/Core/Container/Container.php b/application/Espo/Core/Container/Container.php
new file mode 100644
index 0000000000..054aca13b4
--- /dev/null
+++ b/application/Espo/Core/Container/Container.php
@@ -0,0 +1,67 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Container;
+
+use ReflectionClass;
+use RuntimeException;
+
+/**
+ * DI container for services. Lazy initialization is used. Services are instantiated only once.
+ *
+ * See https://docs.espocrm.com/development/di/.
+ */
+interface Container
+{
+    /**
+     * Obtain a service object.
+     *
+     * @throws RuntimeException If not gettable.
+     */
+    public function get(string $name) : object;
+
+    /**
+     * Check whether a service can be obtained.
+     */
+    public function has(string $name) : bool;
+
+    /**
+     * Set a service object. Must be configured as settable.
+     *
+     * @throws RuntimeException Is not settable or already set.
+     */
+    public function set(string $name, object $object) : void;
+
+    /**
+     * Get a class of a service.
+     *
+     * @throws RuntimeException If not gettable.
+     */
+    public function getClass(string $name) : ReflectionClass;
+}
diff --git a/application/Espo/Core/ContainerBuilder.php b/application/Espo/Core/Container/ContainerBuilder.php
similarity index 98%
rename from application/Espo/Core/ContainerBuilder.php
rename to application/Espo/Core/Container/ContainerBuilder.php
index ff5fd34cb3..c5f15b5ead 100644
--- a/application/Espo/Core/ContainerBuilder.php
+++ b/application/Espo/Core/Container/ContainerBuilder.php
@@ -27,11 +27,11 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-namespace Espo\Core;
+namespace Espo\Core\Container;
 
 use Espo\Core\{
     Container,
-    ContainerConfiguration,
+    Container\ContainerConfiguration,
     Binding\BindingContainer,
     Binding\BindingLoader,
     Binding\EspoBindingLoader,
diff --git a/application/Espo/Core/ContainerConfiguration.php b/application/Espo/Core/Container/ContainerConfiguration.php
similarity index 99%
rename from application/Espo/Core/ContainerConfiguration.php
rename to application/Espo/Core/Container/ContainerConfiguration.php
index 5be70b8bb3..24d0c66052 100644
--- a/application/Espo/Core/ContainerConfiguration.php
+++ b/application/Espo/Core/Container/ContainerConfiguration.php
@@ -27,7 +27,7 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-namespace Espo\Core;
+namespace Espo\Core\Container;
 
 use Espo\Core\{
     Utils\Log,
@@ -40,6 +40,7 @@ use Exception;
 class ContainerConfiguration
 {
     protected $log;
+
     protected $metadata;
 
     public function __construct(Log $log, Metadata $metadata)
diff --git a/application/Espo/Core/Container/Loader.php b/application/Espo/Core/Container/Loader.php
new file mode 100644
index 0000000000..2c2bf6d3b2
--- /dev/null
+++ b/application/Espo/Core/Container/Loader.php
@@ -0,0 +1,36 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Container;
+
+interface Loader
+{
+    // @todo Uncomment when PHP 7.4 is a min supported version.
+    //public function load() : object;
+}
diff --git a/application/Espo/Core/Loaders/Acl.php b/application/Espo/Core/Loaders/Acl.php
index 2e8a5b3e8b..183ffe0afe 100644
--- a/application/Espo/Core/Loaders/Acl.php
+++ b/application/Espo/Core/Loaders/Acl.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     AclManager,
     Acl as AclService,
 };
@@ -38,8 +39,9 @@ use Espo\Entities\User;
 
 class Acl implements Loader
 {
-    protected $aclManager;
-    protected $user;
+    private $aclManager;
+
+    private $user;
 
     public function __construct(AclManager $aclManager, User $user)
     {
diff --git a/application/Espo/Core/Loaders/AclManager.php b/application/Espo/Core/Loaders/AclManager.php
index 43fe638e36..3c30c2b6ac 100644
--- a/application/Espo/Core/Loaders/AclManager.php
+++ b/application/Espo/Core/Loaders/AclManager.php
@@ -30,13 +30,14 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     InjectableFactory,
     AclManager as AclManagerService,
 };
 
 class AclManager implements Loader
 {
-    protected $injectableFactory;
+    private $injectableFactory;
 
     public function __construct(InjectableFactory $injectableFactory)
     {
diff --git a/application/Espo/Core/Loaders/ApplicationState.php b/application/Espo/Core/Loaders/ApplicationState.php
index 2580dae8ad..373429b31f 100644
--- a/application/Espo/Core/Loaders/ApplicationState.php
+++ b/application/Espo/Core/Loaders/ApplicationState.php
@@ -30,13 +30,14 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Container,
     ApplicationState as ApplicationStateService,
 };
 
 class ApplicationState implements Loader
 {
-    protected $container;
+    private $container;
 
     public function __construct(Container $container)
     {
diff --git a/application/Espo/Core/Loaders/ApplicationUser.php b/application/Espo/Core/Loaders/ApplicationUser.php
index df48d413d5..67932dc6fb 100644
--- a/application/Espo/Core/Loaders/ApplicationUser.php
+++ b/application/Espo/Core/Loaders/ApplicationUser.php
@@ -30,13 +30,14 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     InjectableFactory,
     ApplicationUser as Service,
 };
 
 class ApplicationUser implements Loader
 {
-    protected $injectableFactory;
+    private $injectableFactory;
 
     public function __construct(InjectableFactory $injectableFactory)
     {
diff --git a/application/Espo/Core/Loaders/BaseLanguage.php b/application/Espo/Core/Loaders/BaseLanguage.php
index bdc5686aa0..3516305d2b 100644
--- a/application/Espo/Core/Loaders/BaseLanguage.php
+++ b/application/Espo/Core/Loaders/BaseLanguage.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Utils\Metadata,
     Utils\Config,
     Utils\File\Manager as FileManager,
@@ -40,8 +41,11 @@ use Espo\Core\{
 class BaseLanguage implements Loader
 {
     protected $fileManager;
+
     protected $config;
+
     protected $metadata;
+
     protected $dataCache;
 
     public function __construct(FileManager $fileManager, Config $config, Metadata $metadata, DataCache $dataCache)
diff --git a/application/Espo/Core/Loaders/DataManager.php b/application/Espo/Core/Loaders/DataManager.php
index 03a655c55c..9391932246 100644
--- a/application/Espo/Core/Loaders/DataManager.php
+++ b/application/Espo/Core/Loaders/DataManager.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     InjectableFactory,
     DataManager as DataManagerService,
 };
diff --git a/application/Espo/Core/Loaders/DateTime.php b/application/Espo/Core/Loaders/DateTime.php
index 879e71141e..3ea9d3e242 100644
--- a/application/Espo/Core/Loaders/DateTime.php
+++ b/application/Espo/Core/Loaders/DateTime.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Utils\Config,
     Utils\DateTime as DateTimeService,
 };
diff --git a/application/Espo/Core/Loaders/EntityManager.php b/application/Espo/Core/Loaders/EntityManager.php
index 43e9cbcd70..709dd3d836 100644
--- a/application/Espo/Core/Loaders/EntityManager.php
+++ b/application/Espo/Core/Loaders/EntityManager.php
@@ -30,13 +30,14 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     ORM\EntityManagerFactory,
     ORM\EntityManager as EntityManagerService,
 };
 
 class EntityManager implements Loader
 {
-    protected $entityManagerFactory;
+    private $entityManagerFactory;
 
     public function __construct(EntityManagerFactory $entityManagerFactory)
     {
diff --git a/application/Espo/Core/Loaders/InternalAclManager.php b/application/Espo/Core/Loaders/InternalAclManager.php
index 0018f4a2f2..20e398152d 100644
--- a/application/Espo/Core/Loaders/InternalAclManager.php
+++ b/application/Espo/Core/Loaders/InternalAclManager.php
@@ -30,12 +30,15 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Container,
     AclManager as AclManagerService,
 };
 
 class InternalAclManager implements Loader
 {
+    private $container;
+
     public function __construct(Container $container)
     {
         $this->container = $container;
diff --git a/application/Espo/Core/Loaders/Language.php b/application/Espo/Core/Loaders/Language.php
index 521482c1f7..82a74ec78b 100644
--- a/application/Espo/Core/Loaders/Language.php
+++ b/application/Espo/Core/Loaders/Language.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Utils\Metadata,
     Utils\Config,
     Utils\File\Manager as FileManager,
@@ -42,9 +43,13 @@ use Espo\Entities\Preferences;
 class Language implements Loader
 {
     protected $fileManager;
+
     protected $config;
+
     protected $metadata;
+
     protected $dataCache;
+
     protected $preferences;
 
     public function __construct(
diff --git a/application/Espo/Core/Loaders/Loader.php b/application/Espo/Core/Loaders/Loader.php
index 80008f831f..5764e1f043 100644
--- a/application/Espo/Core/Loaders/Loader.php
+++ b/application/Espo/Core/Loaders/Loader.php
@@ -29,8 +29,11 @@
 
 namespace Espo\Core\Loaders;
 
-interface Loader
+use Espo\Core\Container\Loader as BaseLoader;
+
+/**
+ * @deprecated Since v6.2.0. Use `Espo\Core\Container\Loader`.
+ */
+interface Loader extends BaseLoader
 {
-    // @todo Uncomment when PHP 7.4 is a min supported version.
-    //public function load() : object;
 }
diff --git a/application/Espo/Core/Loaders/Log.php b/application/Espo/Core/Loaders/Log.php
index 2d1389383d..02cb5d0827 100644
--- a/application/Espo/Core/Loaders/Log.php
+++ b/application/Espo/Core/Loaders/Log.php
@@ -30,13 +30,14 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Log\LogLoader,
     Utils\Log as LogService,
 };
 
 class Log implements Loader
 {
-    protected $logLoader;
+    private $logLoader;
 
     public function __construct(LogLoader $logLoader)
     {
@@ -47,6 +48,7 @@ class Log implements Loader
     {
         $log = $this->logLoader->load();
 
+        // @todo Remove in future.
         $GLOBALS['log'] = $log;
 
         return $log;
diff --git a/application/Espo/Core/Loaders/Metadata.php b/application/Espo/Core/Loaders/Metadata.php
index 21dafedc4f..474702e28e 100644
--- a/application/Espo/Core/Loaders/Metadata.php
+++ b/application/Espo/Core/Loaders/Metadata.php
@@ -30,8 +30,8 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Utils\Metadata as MetadataService,
-    InjectableFactory,
     Utils\File\Manager as FileManager,
     Utils\DataCache,
     Utils\Config,
@@ -39,9 +39,11 @@ use Espo\Core\{
 
 class Metadata implements Loader
 {
-    protected $fileManager;
-    protected $dataCache;
-    protected $config;
+    private $fileManager;
+
+    private $dataCache;
+
+    private $config;
 
     public function __construct(FileManager $fileManager, DataCache $dataCache, Config $config)
     {
diff --git a/application/Espo/Core/Loaders/NumberUtil.php b/application/Espo/Core/Loaders/NumberUtil.php
index a1738fc860..1fd23d90ef 100644
--- a/application/Espo/Core/Loaders/NumberUtil.php
+++ b/application/Espo/Core/Loaders/NumberUtil.php
@@ -30,13 +30,14 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Utils\Config,
     Utils\NumberUtil as NumberUtilService,
 };
 
 class NumberUtil implements Loader
 {
-    protected $config;
+    private $config;
 
     public function __construct(Config $config)
     {
diff --git a/application/Espo/Core/Loaders/OrmDefs.php b/application/Espo/Core/Loaders/OrmDefs.php
index 2cbef6d05b..38cb15b8be 100644
--- a/application/Espo/Core/Loaders/OrmDefs.php
+++ b/application/Espo/Core/Loaders/OrmDefs.php
@@ -29,6 +29,10 @@
 
 namespace Espo\Core\Loaders;
 
+use Espo\{
+    Core\Container\Loader,
+};
+
 use Espo\{
     ORM\Defs\Defs,
     ORM\EntityManager,
@@ -36,7 +40,7 @@ use Espo\{
 
 class OrmDefs implements Loader
 {
-    protected $entityManager;
+    private $entityManager;
 
     public function __construct(EntityManager $entityManager)
     {
diff --git a/application/Espo/Core/Loaders/PortalAclManagerContainer.php b/application/Espo/Core/Loaders/PortalAclManagerContainer.php
index bf77c82f85..01342c1c0b 100644
--- a/application/Espo/Core/Loaders/PortalAclManagerContainer.php
+++ b/application/Espo/Core/Loaders/PortalAclManagerContainer.php
@@ -30,13 +30,14 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     InjectableFactory,
     Portal\AclManagerContainer as PortalAclManagerContainerService
 };
 
 class PortalAclManagerContainer implements Loader
 {
-    protected $injectableFactory;
+    private $injectableFactory;
 
     public function __construct(InjectableFactory $injectableFactory) {
         $this->injectableFactory = $injectableFactory;
diff --git a/application/Espo/Core/Loaders/Preferences.php b/application/Espo/Core/Loaders/Preferences.php
index d9904c8dbe..df928f6076 100644
--- a/application/Espo/Core/Loaders/Preferences.php
+++ b/application/Espo/Core/Loaders/Preferences.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     ORM\EntityManager,
     ApplicationState,
 };
@@ -40,8 +41,9 @@ use Espo\Entities\{
 
 class Preferences implements Loader
 {
-    protected $entityManager;
-    protected $applicationState;
+    private $entityManager;
+
+    private $applicationState;
 
     public function __construct(EntityManager $entityManager, ApplicationState $applicationState)
     {
diff --git a/application/Espo/Core/Portal/Application.php b/application/Espo/Core/Portal/Application.php
index d250f3a75e..068568b319 100644
--- a/application/Espo/Core/Portal/Application.php
+++ b/application/Espo/Core/Portal/Application.php
@@ -36,9 +36,9 @@ use Espo\Core\Exceptions\{
 };
 
 use Espo\Core\{
-    ContainerBuilder,
+    Container\ContainerBuilder,
     Portal\Container as PortalContainer,
-    Portal\ContainerConfiguration as PortalContainerConfiguration,
+    Portal\Container\ContainerConfiguration as PortalContainerConfiguration,
     Portal\Utils\Config,
     Application as BaseApplication,
 };
diff --git a/application/Espo/Core/Portal/ContainerConfiguration.php b/application/Espo/Core/Portal/Container/ContainerConfiguration.php
similarity index 96%
rename from application/Espo/Core/Portal/ContainerConfiguration.php
rename to application/Espo/Core/Portal/Container/ContainerConfiguration.php
index 4316bf9b28..c694c6ea81 100644
--- a/application/Espo/Core/Portal/ContainerConfiguration.php
+++ b/application/Espo/Core/Portal/Container/ContainerConfiguration.php
@@ -27,10 +27,10 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-namespace Espo\Core\Portal;
+namespace Espo\Core\Portal\Container;
 
 use Espo\Core\{
-    ContainerConfiguration as BaseContainerConfiguration,
+    Container\ContainerConfiguration as BaseContainerConfiguration,
 };
 
 class ContainerConfiguration extends BaseContainerConfiguration
diff --git a/application/Espo/Core/Portal/Loaders/Acl.php b/application/Espo/Core/Portal/Loaders/Acl.php
index 0f66d747eb..e82de130e9 100644
--- a/application/Espo/Core/Portal/Loaders/Acl.php
+++ b/application/Espo/Core/Portal/Loaders/Acl.php
@@ -30,8 +30,8 @@
 namespace Espo\Core\Portal\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     AclManager,
-    Loaders\Loader,
     Portal\Acl as AclService,
 };
 
@@ -39,6 +39,10 @@ use Espo\Entities\User;
 
 class Acl implements Loader
 {
+    private $aclManager;
+
+    private $user;
+
     public function __construct(AclManager $aclManager, User $user)
     {
         $this->aclManager = $aclManager;
diff --git a/application/Espo/Core/Portal/Loaders/AclManager.php b/application/Espo/Core/Portal/Loaders/AclManager.php
index 832a5901b8..b0a25c0361 100644
--- a/application/Espo/Core/Portal/Loaders/AclManager.php
+++ b/application/Espo/Core/Portal/Loaders/AclManager.php
@@ -30,16 +30,17 @@
 namespace Espo\Core\Portal\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     InjectableFactory,
     AclManager as InternalAclManager,
-    Loaders\Loader,
     Portal\AclManager as PortalAclManager,
 };
 
 class AclManager implements Loader
 {
-    protected $injectableFactory;
-    protected $internalAclManager;
+    private $injectableFactory;
+
+    private $internalAclManager;
 
     public function __construct(InjectableFactory $injectableFactory, InternalAclManager $internalAclManager)
     {
diff --git a/application/Espo/Core/Portal/Loaders/InternalAclManager.php b/application/Espo/Core/Portal/Loaders/InternalAclManager.php
index fb6a0fa59f..30ffdf271e 100644
--- a/application/Espo/Core/Portal/Loaders/InternalAclManager.php
+++ b/application/Espo/Core/Portal/Loaders/InternalAclManager.php
@@ -30,14 +30,14 @@
 namespace Espo\Core\Portal\Loaders;
 
 use Espo\Core\{
-    Loaders\Loader,
+    Container\Loader,
     InjectableFactory,
     AclManager as InternalAclManagerService,
 };
 
 class InternalAclManager implements Loader
 {
-    protected $injectableFactory;
+    private $injectableFactory;
 
     public function __construct(InjectableFactory $injectableFactory)
     {
diff --git a/application/Espo/Core/Portal/Loaders/Language.php b/application/Espo/Core/Portal/Loaders/Language.php
index 82dbaffb6e..59347cbbde 100644
--- a/application/Espo/Core/Portal/Loaders/Language.php
+++ b/application/Espo/Core/Portal/Loaders/Language.php
@@ -30,11 +30,11 @@
 namespace Espo\Core\Portal\Loaders;
 
 use Espo\Core\{
+    Container\Loader,
     Utils\Metadata,
     Utils\Config,
     Utils\File\Manager as FileManager,
     Portal\Utils\Language as LanguageService,
-    Loaders\Loader as Loader,
     Utils\DataCache,
 };
 
@@ -45,15 +45,25 @@ use Espo\Entities\{
 
 class Language implements Loader
 {
-    protected $fileManager;
-    protected $config;
-    protected $metadata;
-    protected $dataCache;
-    protected $preferences;
-    protected $portal;
+    private $fileManager;
+
+    private $config;
+
+    private $metadata;
+
+    private $dataCache;
+
+    private $preferences;
+
+    private $portal;
 
     public function __construct(
-        FileManager $fileManager, Config $config, Metadata $metadata, DataCache $dataCache, Preferences $preferences, Portal $portal
+        FileManager $fileManager,
+        Config $config,
+        Metadata $metadata,
+        DataCache $dataCache,
+        Preferences $preferences,
+        Portal $portal
     ) {
         $this->fileManager = $fileManager;
         $this->config = $config;