Zend Framework 2 – can't get around ServiceNotFoundException - php

Question

Today I bought a book to learn the Zend Framework 2. Having started with the skeleton Application & skeleton module, I made good progress, until database interaction started. Now every time I want to do something with the database, I get the following exception:
Zend\ServiceManager\Exception\ServiceNotFoundException
File: /Applications/AMPPS/www/myproject/ZendSkeletonApplication/vendor/zendframework/zendframework/library/Zend/ServiceManager/ServiceManager.php:529
Message:
Zend\ServiceManager\ServiceManager::get was unable to fetch or create an instance for Zend\Db\Adapter\Adapter
Possible reasons for this could be incorrect database details, but having used the same credentials for other projects, I know they are correct (local development).
My global.php looks like this – I can't see any errors:
return array(
'db' => array(
'driver' => 'Pdo',
'dsn' => 'mysql:dbname=mydatabasename;host=localhost',
'username' => 'root',
'password' => 'mysql',
'driver_options' => array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
),
'service_manager' => array(
'factories' => array(
'Zend\Db\Adapter\Adapter' => 'Zend\Db\Adapter\AdapterServiceFactory'
),
),
)
);
Following the stacktrace, the error must be in the beginning of this method:
protected function createUser(array $data)
{
$sm = $this->getServiceLocator();
$dbAdapter = $sm->get('Zend\Db\Adapter\Adapter');
$resultSetPrototype = new \Zend\Db\ResultSet\ResultSet();
$resultSetPrototype->setArrayObjectPrototype(new \Users\Model\User);
$tableGateway = new \Zend\Db\TableGateway\TableGateway('user', $dbAdapter, null, $resultSetPrototype);
$user = new User();
$user->exchangeArray($data);
$userTable = new UserTable($tableGateway);
$userTable->saveUser($user);
return true;
}
But again, I can't see any error here, which leaves me a bit puzzled. I guess the error is more than just a typo.
The class that method is located in uses the following Zend Framework 2 components (besides self written ones):
use Zend\Mvc\Controller\AbstractActionController;
use Zend\View\Model\ViewModel;
Do I need to add something here, maybe to be able to use the getServiceLocator() method? I don't know there that method is located.
Do you have anymore ideas what could cause this exception? I am using Zend Framework 2.3.2

Answer 1

You have put the service_manager key as a subset to db. This is wrong.
The service_manager key needs to be top level.
return array(
'db' => array(
'driver' => 'Pdo',
'dsn' => 'mysql:dbname=mydatabasename;host=localhost',
'username' => 'root',
'password' => 'mysql',
'driver_options' => array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
),
),
'service_manager' => array(
'factories' => array(
'Zend\Db\Adapter\Adapter' => 'Zend\Db\Adapter\AdapterServiceFactory'
)
)
);