diff --git a/application/Espo/Core/Application.php b/application/Espo/Core/Application.php
index eeb34cd6ec..427c601f61 100644
--- a/application/Espo/Core/Application.php
+++ b/application/Espo/Core/Application.php
@@ -48,6 +48,7 @@ class Application
         $GLOBALS['log'] = $this->getContainer()->get('log');
 
         $this->initAutoloads();
+        $this->initPreloads();
     }
 
     protected function initContainer()
@@ -346,6 +347,15 @@ class Application
         $autoload->register();
     }
 
+    protected function initPreloads()
+    {
+        foreach ($this->getMetadata()->get(['app', 'containerServices']) ?? [] as $name => $defs) {
+            if ($defs['preload'] ?? false) {
+                $this->getContainer()->get($name);
+            }
+        }
+    }
+
     public function setBasePath($basePath)
     {
         $this->getContainer()->get('clientManager')->setBasePath($basePath);
diff --git a/application/Espo/Core/Container.php b/application/Espo/Core/Container.php
index 304818aad4..062e76a125 100644
--- a/application/Espo/Core/Container.php
+++ b/application/Espo/Core/Container.php
@@ -61,9 +61,10 @@ class Container
             $obj = $this->$loadMethod();
             $this->data[$name] = $obj;
         } else {
+            $metadata = $this->get('metadata');
 
             try {
-                $className = $this->get('metadata')->get(['app', 'loaders', ucfirst($name)]);
+                $className = $metadata->get(['app', 'loaders', ucfirst($name)]);
             } catch (\Exception $e) {}
 
             if (!isset($className) || !class_exists($className)) {
@@ -73,19 +74,46 @@ class Container
                 }
             }
 
+            $object = null;
+
             if (class_exists($className)) {
-                 $loadClass = new $className($this);
-                 $this->data[$name] = $loadClass->load();
+                $loadClass = new $className($this);
+                $object = $loadClass->load();
+                $this->data[$name] = $object;
+            } else {
+                $className = $this->getServiceClassName($name);
+
+                if ($className && class_exists($className)) {
+
+                    $dependencyList = $metadata->get(['app', 'containerServices', $name, 'dependencyList']) ?? [];
+                    $dependencyObjectList = [];
+                    foreach ($dependencyList as $item) {
+                        $dependencyObjectList[] = $this->get($item);
+                    }
+                    $reflector = new \ReflectionClass($className);
+                    if ($reflector->isSubclassOf('\\Espo\\Core\\Interfaces\\InjectableService')) {
+                        $object = $reflector->newInstance();
+                        foreach ($dependencyObjectList as $i => $item) {
+                            $object->inject($dependencyList[$i], $item);
+                        }
+                    } else {
+                        $object = $reflector->newInstanceArgs($dependencyObjectList);
+                    }
+                    $this->data[$name] = $object;
+                }
             }
         }
 
         return null;
     }
 
-    public function getServiceClassName(string $name, string $default)
+    public function getServiceClassName(string $name, ?string $default = null)
     {
         $metadata = $this->get('metadata');
-        $className = $metadata->get(['app', 'serviceContainer', 'classNames',  $name], $default);
+
+        $className = $metadata->get(['app', 'containerServices',  $name, 'className']) ??
+            $metadata->get(['app', 'serviceContainer', 'classNames',  $name], $default);
+
         return $className;
     }
 
diff --git a/application/Espo/Core/InjectableService.php b/application/Espo/Core/InjectableService.php
new file mode 100644
index 0000000000..799db48fd1
--- /dev/null
+++ b/application/Espo/Core/InjectableService.php
@@ -0,0 +1,58 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2019 Yuri Kuznetsov, Taras Machyshyn, Oleksiy 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;
+
+abstract class InjectableService implements \Espo\Core\Interfaces\InjectableService
+{
+    protected $injections = [];
+
+    public function inject(string $name, object $object)
+    {
+        $this->injections[$name] = $object;
+    }
+
+    public function __call($methodName, $args)
+    {
+        if (strpos($methodName, 'get') === 0) {
+            $injectionName = lcfirst(substr($methodName, 3));
+            if (isset($this->injections[$injectionName])) {
+                return $this->getInjection($injectionName);
+            }
+        }
+        throw new \BadMethodCallException('Method ' . $methodName . ' does not exist');
+    }
+
+    protected function getInjection(string $name) : object
+    {
+        $object = $this->injections[$name] ?? null;
+        if (!$object) throw new \Exception("Injection {$name} is not set.");
+        return $object;
+    }
+}
diff --git a/application/Espo/Core/Loaders/ClientManager.php b/application/Espo/Core/Interfaces/InjectableService.php
similarity index 81%
rename from application/Espo/Core/Loaders/ClientManager.php
rename to application/Espo/Core/Interfaces/InjectableService.php
index c0b446ccb1..63f285dd5a 100644
--- a/application/Espo/Core/Loaders/ClientManager.php
+++ b/application/Espo/Core/Interfaces/InjectableService.php
@@ -27,16 +27,10 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-namespace Espo\Core\Loaders;
+namespace Espo\Core\Interfaces;
 
-class ClientManager extends Base
+interface InjectableService
 {
-    public function load()
-    {
-        return new \Espo\Core\Utils\ClientManager(
-            $this->getContainer()->get('config'),
-            $this->getContainer()->get('themeManager'),
-            $this->getContainer()->get('metadata')
-        );
-    }
+    public function inject(string $name, object $object);
 }
+
diff --git a/application/Espo/Core/Portal/Container.php b/application/Espo/Core/Portal/Container.php
index 57948a55a0..d32c9b557b 100644
--- a/application/Espo/Core/Portal/Container.php
+++ b/application/Espo/Core/Portal/Container.php
@@ -31,23 +31,20 @@ namespace Espo\Core\Portal;
 
 class Container extends \Espo\Core\Container
 {
-    public function getServiceClassName(string $name, string $default)
+    public function getServicePortalClassName(string $name, ?string $default = null)
     {
         $metadata = $this->get('metadata');
-        $className = $metadata->get(['app', 'serviceContainerPortal', 'classNames',  $name], $default);
-        return $className;
+        return $metadata->get(['app', 'portalContainerServices',  $name, 'className'], $default);
     }
 
-    protected function getServiceMainClassName(string $name, string $default)
+    protected function getServiceMainClassName(string $name, ?string $default = null)
     {
-        $metadata = $this->get('metadata');
-        $className = $metadata->get(['app', 'serviceContainer', 'classNames',  $name], $default);
-        return $className;
+        return parent::getServiceClassName($name, $default);
     }
 
     protected function loadAclManager()
     {
-        $className = $this->getServiceClassName('aclManager', '\\Espo\\Core\\Portal\\AclManager');
+        $className = $this->getServicePortalClassName('aclManager', '\\Espo\\Core\\Portal\\AclManager');
         $mainClassName = $this->getServiceMainClassName('aclManager', '\\Espo\\Core\\AclManager');
 
         $obj = new $className(
@@ -63,7 +60,7 @@ class Container extends \Espo\Core\Container
 
     protected function loadAcl()
     {
-        $className = $this->getServiceClassName('acl', '\\Espo\\Core\\Portal\\Acl');
+        $className = $this->getServicePortalClassName('acl', '\\Espo\\Core\\Portal\\Acl');
         return new $className(
             $this->get('aclManager'),
             $this->get('user')
diff --git a/application/Espo/Resources/metadata/app/containerServices.json b/application/Espo/Resources/metadata/app/containerServices.json
new file mode 100644
index 0000000000..7499f843c2
--- /dev/null
+++ b/application/Espo/Resources/metadata/app/containerServices.json
@@ -0,0 +1,6 @@
+{
+    "clientManager": {
+        "className": "\\Espo\\Core\\Utils\\ClientManager",
+        "dependencyList": ["config", "themeManager", "metadata"]
+    }
+}
\ No newline at end of file
diff --git a/application/Espo/Resources/metadata/app/metadata.json b/application/Espo/Resources/metadata/app/metadata.json
index 840afc945f..cc90a9943b 100644
--- a/application/Espo/Resources/metadata/app/metadata.json
+++ b/application/Espo/Resources/metadata/app/metadata.json
@@ -2,6 +2,9 @@
     "frontendHiddenPathList": [
         ["app", "metadata"],
         ["app", "loaders"],
+        ["app", "containerServices"],
+        ["app", "portalContainerServices"],
+        ["app", "serviceContainer"],
         ["app", "consoleCommands"],
         ["app", "formula", "functionClassNameMap"],
         ["app", "fileStorage", "implementationClassNameMap"],