diff --git a/ChangeLog b/ChangeLog
index 7948a86..c63171b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+3.0.2
+    2018-08-16
+    Daniel Lorenz <https://github.com/extcode>
+
+    * TASK #23: refactor extension manager warnings
+
 3.0.1
     2018-08-16
     Daniel Lorenz <https://github.com/extcode>
diff --git a/Classes/Controller/Backend/ContactController.php b/Classes/Controller/Backend/ContactController.php
index bc3b8b3..cc9ad01 100755
--- a/Classes/Controller/Backend/ContactController.php
+++ b/Classes/Controller/Backend/ContactController.php
@@ -86,7 +86,7 @@ public function listAction()
      *
      * @param \Extcode\Contacts\Domain\Model\Contact $contact
      *
-     * @ignorevalidation $contact
+     * @TYPO3\CMS\Extbase\Annotation\IgnoreValidation $contact
      */
     public function showAction(\Extcode\Contacts\Domain\Model\Contact $contact = null)
     {
diff --git a/Classes/Domain/Model/Address.php b/Classes/Domain/Model/Address.php
index 3309777..9602ebb 100755
--- a/Classes/Domain/Model/Address.php
+++ b/Classes/Domain/Model/Address.php
@@ -116,8 +116,8 @@ class Address extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
     /**
      * TT Content
      *
+     * @TYPO3\CMS\Extbase\Annotation\ORM\Lazy
      * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Extcode\Contacts\Domain\Model\TtContent>
-     * @lazy
      */
     protected $ttContent;
 
diff --git a/Classes/Domain/Model/Company.php b/Classes/Domain/Model/Company.php
index 95244dc..a7ee5a0 100755
--- a/Classes/Domain/Model/Company.php
+++ b/Classes/Domain/Model/Company.php
@@ -26,7 +26,7 @@ class Company extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * Name
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $name;
 
@@ -124,8 +124,8 @@ class Company extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
     /**
      * TT Content
      *
+     * @TYPO3\CMS\Extbase\Annotation\ORM\Lazy
      * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Extcode\Contacts\Domain\Model\TtContent>
-     * @lazy
      */
     protected $ttContent;
 
diff --git a/Classes/Domain/Model/Contact.php b/Classes/Domain/Model/Contact.php
index 47a9218..e16a3c7 100755
--- a/Classes/Domain/Model/Contact.php
+++ b/Classes/Domain/Model/Contact.php
@@ -40,7 +40,7 @@ class Contact extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * First Name
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $firstName;
 
@@ -48,7 +48,7 @@ class Contact extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * Last Name
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $lastName;
 
@@ -104,8 +104,8 @@ class Contact extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
     /**
      * TT Content
      *
+     * @TYPO3\CMS\Extbase\Annotation\ORM\Lazy
      * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Extcode\Contacts\Domain\Model\TtContent>
-     * @lazy
      */
     protected $ttContent;
 
diff --git a/Classes/Domain/Model/Country.php b/Classes/Domain/Model/Country.php
index 7b9da93..f554fd9 100755
--- a/Classes/Domain/Model/Country.php
+++ b/Classes/Domain/Model/Country.php
@@ -26,7 +26,7 @@ class Country extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * Iso2
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $iso2 = '';
 
@@ -34,7 +34,7 @@ class Country extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * Iso3
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $iso3 = '';
 
@@ -42,7 +42,7 @@ class Country extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * Name
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $name = '';
 
@@ -57,19 +57,19 @@ class Country extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * PhoneCountryCode
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $phoneCountryCode = '';
 
     /**
      * @param string $iso2
      *
-     * @throws \TYPO3\CMS\Extbase\Property\Exception\InvalidPropertyException
+     * @throws \TYPO3\CMS\Extbase\Property\Exception
      */
     public function setIso2($iso2)
     {
         if (strlen($iso2) != 2) {
-            throw new \TYPO3\CMS\Extbase\Property\Exception\InvalidPropertyException(
+            throw new \TYPO3\CMS\Extbase\Property\Exception(
                 'The iso2 code has to have two chars.',
                 1395925918
             );
@@ -89,12 +89,12 @@ public function getIso2()
     /**
      * @param string $iso3
      *
-     * @throws \TYPO3\CMS\Extbase\Property\Exception\InvalidPropertyException
+     * @throws \TYPO3\CMS\Extbase\Property\Exception
      */
     public function setIso3($iso3)
     {
         if ((strlen($iso3) != 0) and (strlen($iso3) != 3)) {
-            throw new \TYPO3\CMS\Extbase\Property\Exception\InvalidPropertyException(
+            throw new \TYPO3\CMS\Extbase\Property\Exception(
                 'The iso3 code has to have three chars.',
                 1395925960
             );
diff --git a/Classes/Domain/Model/Phone.php b/Classes/Domain/Model/Phone.php
index 51f7d32..a2c74dd 100755
--- a/Classes/Domain/Model/Phone.php
+++ b/Classes/Domain/Model/Phone.php
@@ -33,7 +33,7 @@ class Phone extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
      * Number
      *
      * @var string
-     * @validate NotEmpty
+     * @TYPO3\CMS\Extbase\Annotation\Validate NotEmpty
      */
     protected $number = '';
 
diff --git a/Configuration/TCA/Overrides/tx_contacts_domain_model_address.php b/Configuration/TCA/Overrides/tx_contacts_domain_model_address.php
index 0b0d106..240eab8 100755
--- a/Configuration/TCA/Overrides/tx_contacts_domain_model_address.php
+++ b/Configuration/TCA/Overrides/tx_contacts_domain_model_address.php
@@ -2,11 +2,14 @@
 
 defined('TYPO3_MODE') or die();
 
+use TYPO3\CMS\Core\Configuration\ExtensionConfiguration;
+use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
 $_LLL = 'LLL:EXT:contacts/Resources/Private/Language/locallang_db.xlf';
 
-$extensionConfArr = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['contacts']);
-$googleMapsLibrary = $extensionConfArr['googleMapsLibrary'];
-$googleMapsApiKey = $extensionConfArr['googleMapsApiKey'];
+$googleMapsLibrary = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('contacts', 'googleMapsLibrary');
+$googleMapsApiKey = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('contacts', 'googleMapsApiKey');
 
 if (!empty($googleMapsLibrary) && !empty($googleMapsApiKey)) {
     $googleMapsField = [
@@ -20,11 +23,11 @@
         ],
     ];
 
-    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTCAcolumns(
+    ExtensionManagementUtility::addTCAcolumns(
         'tx_contacts_domain_model_address',
         $googleMapsField
     );
-    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addToAllTCAtypes(
+    ExtensionManagementUtility::addToAllTCAtypes(
         'tx_contacts_domain_model_address',
         '--linebreak, coords',
         '',
diff --git a/ext_emconf.php b/ext_emconf.php
index 52b9a3d..a259f44 100755
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -17,7 +17,7 @@
     'modify_tables' => '',
     'clearCacheOnLoad' => 0,
     'lockType' => '',
-    'version' => '3.0.1',
+    'version' => '3.0.2',
     'constraints' => [
         'depends' => [
             'typo3' => '9.3.0-9.3.99',