ZF2 - Doctrine2 MongoDB ODM - "The class was not found in the chain configuration namespaces"

ZF2 - Doctrine2 MongoDB ODM - "The class was not found in the chain
configuration namespaces"

I've seen the same error posted often here and have read through and made
changes based on the previous questions and answers, to no avail.
I have installed Doctrine's Mongo ODM with Zend Framework via Composer and
completed the installation as described here
https://github.com/doctrine/DoctrineMongoODMModule
I have modified my /config/autoload/module.doctrine-mongo-odm.local.php
file beyond the recommendations of the above documentation in an effort to
fix my problem and based on answers to similar questions here, so that it
now looks as follows
<?php
return array(
'doctrine' => array(
'connection' => array(
'odm_default' => array(
'server' => 'removed.mongolab.com',
'port' => '43957',
'user' => 'removed',
'password' => 'removed',
'dbname' => 'richard',
'options' => array()
),
),
'configuration' => array(
'odm_default' => array(
'metadata_cache' => 'array',
'driver' => 'odm_default',
'generate_proxies' => true,
'proxy_dir' => 'data/DoctrineMongoODMModule/Proxy',
'proxy_namespace' => 'DoctrineMongoODMModule\Proxy',
'generate_hydrators' => true,
'hydrator_dir' =>
'data/DoctrineMongoODMModule/Hydrator',
'hydrator_namespace' => 'DoctrineMongoODMModule\Hydrator',
'default_db' => 'richard',
'filters' => array(),
'logger' => null
)
),
'odm_default' => array(
'drivers' => array(
'Application\Document' => 'odm_driver'
)
),
'odm_driver' => array(
'class' =>
'Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver',
'cache' => 'array',
'paths' => array(
'module/Application/src/Application/Document'
),
),
'documentmanager' => array(
'odm_default' => array(
'connection' => 'odm_default',
'configuration' => 'odm_default',
'eventmanager' => 'odm_default'
)
),
'eventmanager' => array(
'odm_default' => array(
'subscribers' => array()
)
),
),
);
I have a file /module/Application/src/Application/Document/User.php as
follows
<?php
namespace Application\Document;
use Doctrine\ODM\MongoDB\Mapping\Annotations;
class User {
/** @ODM\Id */
private $id;
/** @ODM\Field(type="bin_data_timestamp") */
private $timestamp;
/** @ODM\Field(type="string") */
private $username;
/** @ODM\Field(type="bin_data_md5") */
private $password;
/** @ODM\Field(type="bin_data_uuid") */
private $salt;
/** @ODM\Field(type="string") */
private $realName;
/** @ODM\Field(type="string") */
private $email;
public function getId() {
return $this->id;
}
// ...
public function setId($id) {
$this->id = $id;
}
// ...
}
In my controller, I'm using the following code.
$dm =
$this->getServiceLocator()->get('doctrine.documentmanager.odm_default');
$user = new User;
$user->setUsername("test");
$dm->persist($user);
$dm->flush();
However, I'm getting the infamous error
The class 'Application\Document\User' was not found in the chain
configured namespaces
Any assistance would be greatly appreciated.