diff --git a/ApplicationAbstract.php b/ApplicationAbstract.php
index ff664c6be..49806be39 100644
--- a/ApplicationAbstract.php
+++ b/ApplicationAbstract.php
@@ -84,106 +84,106 @@ class ApplicationAbstract
     /**
      * Database object.
      *
-     * @var   null|DatabasePool
+     * @var   DatabasePool
      * @since 1.0.0
      */
-    protected ?DatabasePool $dbPool = null;
+    protected DatabasePool $dbPool;
 
     /**
      * Application settings object.
      *
-     * @var   null|CoreSettings
+     * @var   CoreSettings
      * @since 1.0.0
      */
-    protected ?CoreSettings $appSettings = null;
+    protected CoreSettings $appSettings;
 
     /**
      * Account manager instance.
      *
-     * @var   null|AccountManager
+     * @var   AccountManager
      * @since 1.0.0
      */
-    protected ?AccountManager $accountManager = null;
+    protected AccountManager $accountManager;
 
     /**
      * Cache instance.
      *
-     * @var   null|CachePool
+     * @var   CachePool
      * @since 1.0.0
      */
-    protected ?CachePool $cachePool = null;
+    protected CachePool $cachePool;
 
     /**
      * ModuleManager instance.
      *
-     * @var   null|ModuleManager
+     * @var   ModuleManager
      * @since 1.0.0
      */
-    protected ?ModuleManager $moduleManager = null;
+    protected ModuleManager $moduleManager;
 
     /**
      * Router instance.
      *
-     * @var   null|RouterInterface
+     * @var   RouterInterface
      * @since 1.0.0
      */
-    protected ?RouterInterface $router = null;
+    protected RouterInterface $router;
 
     /**
      * Dispatcher instance.
      *
-     * @var   null|Dispatcher
+     * @var   Dispatcher
      * @since 1.0.0
      */
-    protected ?Dispatcher $dispatcher = null;
+    protected Dispatcher $dispatcher;
 
     /**
      * Session instance.
      *
-     * @var   null|SessionInterface
+     * @var   SessionInterface
      * @since 1.0.0
      */
-    protected ?SessionInterface $sessionManager = null;
+    protected SessionInterface $sessionManager;
 
     /**
      * Cookie instance.
      *
-     * @var   null|CookieJar
+     * @var   CookieJar
      * @since 1.0.0
      */
-    protected ?CookieJar $cookieJar = null;
+    protected CookieJar $cookieJar;
 
     /**
      * Server localization.
      *
-     * @var   null|Localization
+     * @var   Localization
      * @since 1.0.0
      */
-    protected ?Localization $l11nServer = null;
+    protected Localization $l11nServer;
 
     /**
      * Server localization.
      *
-     * @var   null|FileLogger
+     * @var   FileLogger
      * @since 1.0.0
      */
-    protected ?FileLogger $logger = null;
+    protected FileLogger $logger;
 
     /**
      * L11n manager.
      *
-     * @var   null|L11nManager
+     * @var   L11nManager
      * @since 1.0.0
      */
-    protected ?L11nManager $l11nManager = null;
+    protected L11nManager $l11nManager;
 
     /**
      * Event manager.
      *
-     * @var   null|EventManager
+     * @var   EventManager
      * @since 1.0.0
      */
-    protected ?EventManager $eventManager = null;
+    protected EventManager $eventManager;
 
     /**
      * Set values
@@ -219,6 +219,6 @@ class ApplicationAbstract
      */
     public function __get($name)
     {
-        return $this->{$name};
+        return isset($this->{$name}) ? $this->{$name} : null;
     }
 }
diff --git a/DataStorage/Database/Connection/ConnectionAbstract.php b/DataStorage/Database/Connection/ConnectionAbstract.php
index 72e34ce15..52dc28565 100644
--- a/DataStorage/Database/Connection/ConnectionAbstract.php
+++ b/DataStorage/Database/Connection/ConnectionAbstract.php
@@ -37,10 +37,10 @@ abstract class ConnectionAbstract implements ConnectionInterface
      *
      * This can be used externally to define queries and execute them.
      *
-     * @var   null|\PDO
+     * @var   \PDO
      * @since 1.0.0
      */
-    public ?\PDO $con = null;
+    public \PDO $con;
 
     /**
      * Database prefix.
@@ -189,7 +189,7 @@ abstract class ConnectionAbstract implements ConnectionInterface
      */
     public function close() : void
     {
-        $this->con    = null;
+        unset($this->con);
         $this->status = DatabaseStatus::CLOSED;
     }
 }
diff --git a/DataStorage/Database/Connection/MysqlConnection.php b/DataStorage/Database/Connection/MysqlConnection.php
index 1535d0117..26fda8287 100644
--- a/DataStorage/Database/Connection/MysqlConnection.php
+++ b/DataStorage/Database/Connection/MysqlConnection.php
@@ -74,6 +74,7 @@ final class MysqlConnection extends ConnectionAbstract
 
             $this->status = DatabaseStatus::OK;
         } catch (\PDOException $e) {
+            unset($this->con);
             $this->status = DatabaseStatus::MISSING_DATABASE;
             throw new InvalidConnectionConfigException((string) \json_encode($this->dbdata));
         } finally {
diff --git a/DataStorage/Database/Connection/PostgresConnection.php b/DataStorage/Database/Connection/PostgresConnection.php
index bec6a1a95..97c8ef99b 100644
--- a/DataStorage/Database/Connection/PostgresConnection.php
+++ b/DataStorage/Database/Connection/PostgresConnection.php
@@ -74,8 +74,8 @@ final class PostgresConnection extends ConnectionAbstract
 
             $this->status = DatabaseStatus::OK;
         } catch (\PDOException $e) {
+            unset($this->con);
             $this->status = DatabaseStatus::MISSING_DATABASE;
-            $this->con    = null;
         } finally {
             $this->dbdata['password'] = '****';
         }
diff --git a/DataStorage/Database/Connection/SQLiteConnection.php b/DataStorage/Database/Connection/SQLiteConnection.php
index 10c9bbd4c..5414ba3e6 100644
--- a/DataStorage/Database/Connection/SQLiteConnection.php
+++ b/DataStorage/Database/Connection/SQLiteConnection.php
@@ -74,8 +74,8 @@ final class SQLiteConnection extends ConnectionAbstract
 
             $this->status = DatabaseStatus::OK;
         } catch (\PDOException $e) {
+            unset($this->con);
             $this->status = DatabaseStatus::MISSING_DATABASE;
-            $this->con    = null;
         } finally {
             $this->dbdata['password'] = '****';
         }
diff --git a/DataStorage/Database/Connection/SqlServerConnection.php b/DataStorage/Database/Connection/SqlServerConnection.php
index e2d464ff4..37742452e 100644
--- a/DataStorage/Database/Connection/SqlServerConnection.php
+++ b/DataStorage/Database/Connection/SqlServerConnection.php
@@ -74,8 +74,8 @@ final class SqlServerConnection extends ConnectionAbstract
 
             $this->status = DatabaseStatus::OK;
         } catch (\PDOException $e) {
+            unset($this->con);
             $this->status = DatabaseStatus::MISSING_DATABASE;
-            $this->con    = null;
         } finally {
             $this->dbdata['password'] = '****';
         }
diff --git a/DataStorage/Session/HttpSession.php b/DataStorage/Session/HttpSession.php
index 77cd6b657..9ea461017 100644
--- a/DataStorage/Session/HttpSession.php
+++ b/DataStorage/Session/HttpSession.php
@@ -28,7 +28,7 @@ use phpOMS\Utils\RnG\StringUtils;
  *
  * @SuppressWarnings(PHPMD.Superglobals)
  */
-class HttpSession implements SessionInterface
+final class HttpSession implements SessionInterface
 {
     /**
      * Is session locked/already set.
@@ -65,21 +65,21 @@ class HttpSession implements SessionInterface
     /**
      * Constructor.
      *
-     * @param int             $liftetime          Session life time
-     * @param bool|int|string $sid                Session id
-     * @param int             $inactivityInterval Interval for session activity
+     * @param int    $liftetime          Session life time
+     * @param string $sid                Session id
+     * @param int    $inactivityInterval Interval for session activity
      *
      * @throws LockException throws this exception if the session is alrady locked for further interaction
      *
      * @since 1.0.0
      */
-    public function __construct(int $liftetime = 3600, $sid = false, int $inactivityInterval = 0)
+    public function __construct(int $liftetime = 3600, $sid = '', int $inactivityInterval = 0)
     {
         if (\session_id()) {
             \session_write_close(); // @codeCoverageIgnore
         }
 
-        if (!\is_bool($sid)) {
+        if ($sid !== '') {
             \session_id((string) $sid);
         }
 
diff --git a/Message/Console/Request.php b/Message/Console/Request.php
index c387389b6..915b30cb2 100644
--- a/Message/Console/Request.php
+++ b/Message/Console/Request.php
@@ -138,19 +138,6 @@ final class Request extends RequestAbstract
         }
     }
 
-    /**
-     * Get request uri.
-     *
-     * @return UriInterface
-     *
-     * @since 1.0.0
-     */
-    public function getUri() : UriInterface
-    {
-        return $this->uri;
-    }
-
-
     /**
      * Get request hash.
      *
diff --git a/Message/Http/Request.php b/Message/Http/Request.php
index 34097c631..7ccbc0348 100644
--- a/Message/Http/Request.php
+++ b/Message/Http/Request.php
@@ -33,14 +33,6 @@ use phpOMS\Uri\UriInterface;
  */
 final class Request extends RequestAbstract
 {
-    /**
-     * Uri.
-     *
-     * @var   UriInterface
-     * @since 1.0.0
-     */
-    protected UriInterface $uri;
-
     /**
      * Request method.
      *
@@ -193,19 +185,6 @@ final class Request extends RequestAbstract
         }
     }
 
-    /**
-     * Get request uri.
-     *
-     * @return UriInterface
-     *
-     * @since 1.0.0
-     */
-    public function getUri() : UriInterface
-    {
-        return $this->uri;
-    }
-
-
     /**
      * Get request hash.
      *
diff --git a/Message/RequestAbstract.php b/Message/RequestAbstract.php
index aeca0ee4e..5f65787db 100644
--- a/Message/RequestAbstract.php
+++ b/Message/RequestAbstract.php
@@ -26,6 +26,14 @@ use phpOMS\Uri\UriInterface;
  */
 abstract class RequestAbstract implements MessageInterface
 {
+    /**
+     * Uri.
+     *
+     * @var   UriInterface
+     * @since 1.0.0
+     */
+    protected UriInterface $uri;
+
     /**
      * Request data.
      *
@@ -233,4 +241,16 @@ abstract class RequestAbstract implements MessageInterface
     {
         return $this->files;
     }
+
+    /**
+     * Get request uri.
+     *
+     * @return UriInterface
+     *
+     * @since 1.0.0
+     */
+    public function getUri() : UriInterface
+    {
+        return $this->uri;
+    }
 }
diff --git a/Module/ModuleAbstract.php b/Module/ModuleAbstract.php
index 413316a93..426b56590 100644
--- a/Module/ModuleAbstract.php
+++ b/Module/ModuleAbstract.php
@@ -91,10 +91,10 @@ abstract class ModuleAbstract
     /**
      * Application instance.
      *
-     * @var   null|ApplicationAbstract
+     * @var   ApplicationAbstract
      * @since 1.0.0
      */
-    protected ?ApplicationAbstract $app = null;
+    protected ApplicationAbstract $app;
 
     /**
      * Constructor.
@@ -105,7 +105,7 @@ abstract class ModuleAbstract
      */
     public function __construct(ApplicationAbstract $app = null)
     {
-        $this->app = $app;
+        $this->app = $app ?? new class extends ApplicationAbstract {};
     }
 
     /**
diff --git a/tests/DataStorage/Session/HttpSessionTest.php b/tests/DataStorage/Session/HttpSessionTest.php
index 9080587e3..069918e89 100644
--- a/tests/DataStorage/Session/HttpSessionTest.php
+++ b/tests/DataStorage/Session/HttpSessionTest.php
@@ -40,7 +40,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testInputOutput() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
         self::assertTrue($session->set('test', 'value'));
         self::assertEquals('value', $session->get('test'));
     }
@@ -51,7 +51,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testInvalidOverwrite() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
         $session->set('test', 'value');
         self::assertFalse($session->set('test', 'value2'));
         self::assertEquals('value', $session->get('test'));
@@ -63,7 +63,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testOverwrite() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
         $session->set('test', 'value');
         self::assertTrue($session->set('test', 'value2', true));
         self::assertEquals('value2', $session->get('test'));
@@ -75,7 +75,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testRemove() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
         $session->set('test', 'value');
         self::assertTrue($session->remove('test'));
     }
@@ -86,7 +86,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testInvalidRemove() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
         $session->set('test', 'value');
         $session->remove('test');
 
@@ -99,7 +99,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testSessionIdInputOutput() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
         $session->setSID('abc');
         self::assertEquals('abc', $session->getSID());
     }
@@ -110,7 +110,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testLockInputOutput() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
 
         $session->lock();
         self::assertTrue($session->isLocked());
@@ -122,7 +122,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testLockInvalidSet() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
 
         $session->lock();
         self::assertFalse($session->set('test', 'value'));
@@ -134,7 +134,7 @@ class HttpSessionTest extends \PHPUnit\Framework\TestCase
      */
     public function testLockInvalidRemove() : void
     {
-        $session = new HttpSession(1, false, 1);
+        $session = new HttpSession(1, '', 1);
 
         self::assertTrue($session->set('test', 'value'));
         $session->lock();