diff --git a/sources/queued/include/queued/QueuedCore.h b/sources/queued/include/queued/QueuedCore.h
index 5e228d8..45cb906 100644
--- a/sources/queued/include/queued/QueuedCore.h
+++ b/sources/queued/include/queued/QueuedCore.h
@@ -53,9 +53,10 @@ class QueuedCore : public QObject
 public:
     /**
      * @brief QueuedCore class constructor
-     * @param parent         pointer to parent item
+     * @param _parent
+     * pointer to parent item
      */
-    explicit QueuedCore(QObject *parent);
+    explicit QueuedCore(QObject *_parent);
     /**
      * @brief QueuedCore class destructor
      */
@@ -382,6 +383,21 @@ private:
      * @throw QueuedDBusException
      */
     void initDBus();
+    /**
+     * @brief method allows to init class if it was not created
+     * @tparam T
+     * class name
+     * @tparam Args
+     * class constructor arguments
+     * @param _dest
+     * pointer to destination
+     * @param _args
+     * class constructor arguments
+     */
+    template<class T, typename... Args> T *initObject(T *_dest, Args... _args)
+    {
+        return _dest ? _dest : new T(this, _args...);
+    };
     /**
      * @brief init plugins
      */
diff --git a/sources/queued/include/queued/QueuedDatabase.h b/sources/queued/include/queued/QueuedDatabase.h
index d55bb97..c2d40f8 100644
--- a/sources/queued/include/queued/QueuedDatabase.h
+++ b/sources/queued/include/queued/QueuedDatabase.h
@@ -57,6 +57,10 @@ public:
      * @brief check and create database
      */
     void checkDatabase();
+    /**
+     * @brief close database connection
+     */
+    void close();
     /**
      * @brief check and create queued administrator if missing
      * @param _user
diff --git a/sources/queued/include/queued/QueuedPluginManager.h b/sources/queued/include/queued/QueuedPluginManager.h
index 0475c6b..8d31e6b 100644
--- a/sources/queued/include/queued/QueuedPluginManager.h
+++ b/sources/queued/include/queued/QueuedPluginManager.h
@@ -83,7 +83,7 @@ public:
      * @brief path to plugin location
      * @return full path to plugin location
      */
-    QStringList pluginLocations() const;
+    static QStringList pluginLocations();
     /**
      * @brief unload plugin
      * @param _name
diff --git a/sources/queued/include/queued/QueuedProcessManager.h b/sources/queued/include/queued/QueuedProcessManager.h
index e6b168c..2d97516 100644
--- a/sources/queued/include/queued/QueuedProcessManager.h
+++ b/sources/queued/include/queued/QueuedProcessManager.h
@@ -58,15 +58,10 @@ public:
 
     /**
      * @brief QueuedProcessManager class constructor
-     * @param parent
+     * @param _parent
      * pointer to parent item
-     * @param processLine
-     * command line pattern
-     * @param onExit
-     * default action on exit
      */
-    explicit QueuedProcessManager(QObject *parent, const QString &processLine,
-                                  const QueuedEnums::ExitAction onExit);
+    explicit QueuedProcessManager(QObject *_parent);
     /**
      * @brief QueuedProcessManager class destructor
      */
diff --git a/sources/queued/include/queued/QueuedSettings.h b/sources/queued/include/queued/QueuedSettings.h
index 6258bd1..dd0c2d5 100644
--- a/sources/queued/include/queued/QueuedSettings.h
+++ b/sources/queued/include/queued/QueuedSettings.h
@@ -42,12 +42,12 @@ class QueuedSettings : public QObject
 public:
     /**
      * @brief QueuedSettings class constructor
-     * @param parent
+     * @param _parent
      * pointer to parent item
-     * @param path
+     * @param _path
      * path to configuration file
      */
-    explicit QueuedSettings(QObject *parent, const QString path);
+    explicit QueuedSettings(QObject *_parent, const QString _path);
     /**
      * @brief QueuedSettings class destructor
      */
diff --git a/sources/queued/include/queued/QueuedTokenManager.h b/sources/queued/include/queued/QueuedTokenManager.h
index 3bf87cb..afc5004 100644
--- a/sources/queued/include/queued/QueuedTokenManager.h
+++ b/sources/queued/include/queued/QueuedTokenManager.h
@@ -66,7 +66,7 @@ public:
      * @brief check if token is valid
      * @param _token
      * token ID
-     * @return token user if token is valid otherwise return false
+     * @return token user if token is valid otherwise return empty string
      */
     QString isTokenValid(const QString &_token) const;
     /**
diff --git a/sources/queued/src/QueuedCore.cpp b/sources/queued/src/QueuedCore.cpp
index ba93b44..2a71f0f 100644
--- a/sources/queued/src/QueuedCore.cpp
+++ b/sources/queued/src/QueuedCore.cpp
@@ -35,8 +35,8 @@
 /**
  * @fn QueuedCore
  */
-QueuedCore::QueuedCore(QObject *parent)
-    : QObject(parent)
+QueuedCore::QueuedCore(QObject *_parent)
+    : QObject(_parent)
 {
     qCDebug(LOG_LIB) << __PRETTY_FUNCTION__;
 }
@@ -565,23 +565,13 @@ void QueuedCore::deinit()
     m_connections.clear();
 
     // dbus cleanup
-    QDBusConnection::sessionBus().unregisterObject(
+    QDBusConnection::systemBus().unregisterObject(
         QueuedConfig::DBUS_OBJECT_PATH);
-    QDBusConnection::sessionBus().unregisterObject(
+    QDBusConnection::systemBus().unregisterObject(
         QueuedConfig::DBUS_PROPERTY_PATH);
-    QDBusConnection::sessionBus().unregisterObject(
+    QDBusConnection::systemBus().unregisterObject(
         QueuedConfig::DBUS_REPORTS_PATH);
-    QDBusConnection::sessionBus().unregisterService(QueuedConfig::DBUS_SERVICE);
-
-    // delete objects now
-    delete m_databaseManager;
-    delete m_reports;
-    delete m_plugins;
-    delete m_processes;
-    delete m_users;
-    delete m_database;
-    delete m_settings;
-    delete m_advancedSettings;
+    QDBusConnection::systemBus().unregisterService(QueuedConfig::DBUS_SERVICE);
 }
 
 
@@ -787,7 +777,7 @@ void QueuedCore::initPlugins()
               .split('\n');
     QString token = m_users->authorize(m_settings->admin().name);
 
-    m_plugins = new QueuedPluginManager(this, token);
+    m_plugins = initObject(m_plugins, token);
     for (auto &plugin : pluginList)
         m_plugins->loadPlugin(plugin, pluginSettings(plugin));
 }
@@ -807,7 +797,9 @@ void QueuedCore::initProcesses()
               ->get(QueuedConfig::QueuedSettings::ProcessCommandLine)
               .toString();
 
-    m_processes = new QueuedProcessManager(this, processLine, onExitAction);
+    m_processes = initObject(m_processes);
+    m_processes->setProcessLine(processLine);
+    m_processes->setExitAction(onExitAction);
     auto dbProcesses
         = m_database->get(QueuedDB::TASKS_TABLE, "WHERE endTime IS NULL");
     m_processes->loadProcesses(dbProcesses);
@@ -831,10 +823,12 @@ void QueuedCore::initProcesses()
 void QueuedCore::initSettings(const QString &_configuration)
 {
     // read configuration first
-    m_settings = new QueuedSettings(this, _configuration);
+    m_settings = initObject(m_settings, _configuration);
+    m_settings->readConfiguration();
     // init database now
     auto dbSetup = m_settings->db();
-    m_database = new QueuedDatabase(this, dbSetup.path, dbSetup.driver);
+    m_database = initObject(m_database,  dbSetup.path, dbSetup.driver);
+    m_database->close();
     bool status = m_database->open(dbSetup.hostname, dbSetup.port,
                                    dbSetup.username, dbSetup.password);
     if (!status) {
@@ -848,7 +842,7 @@ void QueuedCore::initSettings(const QString &_configuration)
     m_database->createAdministrator(dbAdmin.name, dbAdmin.password);
 
     // and load advanced settings
-    m_advancedSettings = new QueuedAdvancedSettings(this);
+    m_advancedSettings = initObject(m_advancedSettings);
     m_advancedSettings->set(m_database->get(QueuedDB::SETTINGS_TABLE));
     if (!m_advancedSettings->checkDatabaseVersion()) {
         qCInfo(LOG_LIB) << "Bump database version to"
@@ -859,9 +853,9 @@ void QueuedCore::initSettings(const QString &_configuration)
     }
 
     // report manager
-    m_reports = new QueuedReportManager(this, m_database);
+    m_reports = initObject(m_reports, m_database);
     // database manager
-    m_databaseManager = new QueuedDatabaseManager(this, m_database);
+    m_databaseManager = initObject(m_databaseManager, m_database);
 }
 
 
@@ -875,7 +869,7 @@ void QueuedCore::initUsers()
         = m_advancedSettings->get(QueuedConfig::QueuedSettings::TokenExpiration)
               .toLongLong();
 
-    m_users = new QueuedUserManager(this);
+    m_users = initObject(m_users);
     m_users->setTokenExpiration(expiry);
     QString now = QDateTime::currentDateTimeUtc().toString(Qt::ISODateWithMs);
     auto dbTokens = m_database->get(
diff --git a/sources/queued/src/QueuedDatabase.cpp b/sources/queued/src/QueuedDatabase.cpp
index 0031fc5..336e9f3 100644
--- a/sources/queued/src/QueuedDatabase.cpp
+++ b/sources/queued/src/QueuedDatabase.cpp
@@ -52,7 +52,7 @@ QueuedDatabase::~QueuedDatabase()
 {
     qCDebug(LOG_LIB) << __PRETTY_FUNCTION__;
 
-    m_database.close();
+    close();
 }
 
 
@@ -73,6 +73,15 @@ void QueuedDatabase::checkDatabase()
 }
 
 
+/**
+ * @fn close
+ */
+void QueuedDatabase::close()
+{
+    m_database.close();
+}
+
+
 /**
  * @fn createAdministrator
  */
diff --git a/sources/queued/src/QueuedPluginManager.cpp b/sources/queued/src/QueuedPluginManager.cpp
index f4d061a..b0bc4d3 100644
--- a/sources/queued/src/QueuedPluginManager.cpp
+++ b/sources/queued/src/QueuedPluginManager.cpp
@@ -99,6 +99,14 @@ bool QueuedPluginManager::loadPlugin(const QString &_name,
 {
     qCDebug(LOG_PL) << "Load plugin" << _name << "with settings" << _settings;
 
+    // check if it was loaded already then call QueuedPluginInterface::init()
+    if (m_plugins.contains(_name)) {
+        m_plugins[_name]->init(_settings);
+        m_plugins[_name]->setToken(m_token);
+        return true;
+    }
+
+    // normal load
     QString libraryName = QString("lib%2.so").arg(_name);
     // init plugin settings with valid keys
     QVariantHash pluginSettings;
@@ -138,7 +146,7 @@ bool QueuedPluginManager::loadPlugin(const QString &_name,
 /**
  * @fn pluginLocations
  */
-QStringList QueuedPluginManager::pluginLocations() const
+QStringList QueuedPluginManager::pluginLocations()
 {
     QStringList locations = QStandardPaths::standardLocations(
         QStandardPaths::GenericDataLocation);
diff --git a/sources/queued/src/QueuedProcessManager.cpp b/sources/queued/src/QueuedProcessManager.cpp
index 8fd2131..f2714dc 100644
--- a/sources/queued/src/QueuedProcessManager.cpp
+++ b/sources/queued/src/QueuedProcessManager.cpp
@@ -31,17 +31,12 @@ extern "C" {
 /**
  * @fn QueuedProcessManager
  */
-QueuedProcessManager::QueuedProcessManager(QObject *parent,
-                                           const QString &processLine,
-                                           const QueuedEnums::ExitAction onExit)
-    : QObject(parent)
+QueuedProcessManager::QueuedProcessManager(QObject *_parent)
+    : QObject(_parent)
 {
     qCDebug(LOG_LIB) << __PRETTY_FUNCTION__;
 
     qRegisterMetaType<QueuedEnums::ExitAction>("QueuedEnums::ExitAction");
-
-    setExitAction(onExit);
-    setProcessLine(processLine);
 }
 
 
diff --git a/sources/queued/src/QueuedSettings.cpp b/sources/queued/src/QueuedSettings.cpp
index 50f9559..807adcd 100644
--- a/sources/queued/src/QueuedSettings.cpp
+++ b/sources/queued/src/QueuedSettings.cpp
@@ -33,9 +33,9 @@
 /**
  * @fn QueuedSettings
  */
-QueuedSettings::QueuedSettings(QObject *parent, const QString path)
-    : QObject(parent)
-    , m_path(path)
+QueuedSettings::QueuedSettings(QObject *_parent, const QString _path)
+    : QObject(_parent)
+    , m_path(_path)
 {
     qCDebug(LOG_LIB) << __PRETTY_FUNCTION__;
 
@@ -43,8 +43,6 @@ QueuedSettings::QueuedSettings(QObject *parent, const QString path)
         "QueuedConfig::QueuedAdminSetup");
     qRegisterMetaType<QueuedConfig::QueuedDBSetup>(
         "QueuedConfig::QueuedDBSetup");
-
-    readConfiguration();
 }
 
 
diff --git a/sources/queued/src/QueuedTokenManager.cpp b/sources/queued/src/QueuedTokenManager.cpp
index 988d42b..0db8162 100644
--- a/sources/queued/src/QueuedTokenManager.cpp
+++ b/sources/queued/src/QueuedTokenManager.cpp
@@ -109,7 +109,7 @@ QString QueuedTokenManager::registerToken(const QString &_user,
                                           const QDateTime &_validUntil)
 {
     // generate from uuid
-    QString &token = QUuid::createUuid().toString().remove('{').remove('}');
+    QString token = QUuid::createUuid().toString().remove('{').remove('}');
     qCInfo(LOG_LIB) << "Registered token" << token << "valid until"
                     << _validUntil;