The target-entity "some entity" cannot be found - php

Question

i am using ZF2 with doctrine i am getting this error.
The target-entity Entity\User cannot be found in 'Subject\Entity\Subject#user'.
Here is the snippet to my code.
<?php
namespace Subject\Entity;
use Doctrine\ORM\Mapping as ORM;
use Zend\InputFilter\InputFilter;
use Zend\InputFilter\Factory as InputFactory;
use Zend\InputFilter\InputFilterAwareInterface;
use Zend\InputFilter\InputFilterInterface;
/**
* #ORM\Entity
* #ORM\Table(name="subject")
* #property string $subjectname
* #property int $user_id
* #property int $id
*/
class Subject implements InputFilterAwareInterface {
protected $inputFilter;
/**
* #ORM\Id
* #ORM\Column(type="integer");
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="string")
*/
protected $subjectname;
/**
* #ORM\ManyToOne(targetEntity="Entity\User", inversedBy="subjects")
* #var User|null
*/
private $user;
/** #return User|null */
public function getUser() {
return $this->user;
}
/** #param User $user */
public function setUser(User $user) {
if($user === null || $user instanceof User) {
$this->user = $user;
} else {
throw new InvalidArgumentException('$user must be instance of Entity\User or null!');
}
}}
and then my "User" entity
namespace Subject\Entity;
use Doctrine\ORM\Mapping as ORM;
use Zend\InputFilter\InputFilter;
use Zend\InputFilter\Factory as InputFactory;
use Zend\InputFilter\InputFilterAwareInterface;
use Zend\InputFilter\InputFilterInterface;
/*
* #ORM\Entity
* #ORM\Table(name="users")
* #property string $username
* #property string $password
* #property int $id
*/
class User implements InputFilterAwareInterface {
protected $_username;
protected $_password;
/**
* #ORM\OneToMany(targetEntity="Entity\Subject", mappedBy="user")
* #var Collection
*/
private $subjects;
/** #ORM\Id() #ORM\Column(type="integer") #ORM\GeneratedValue(strategy="AUTO") #var int */
protected $_id;
public function __get($property) {
return $this->$property;
}
public function __set($property, $value) {
$this->$property = $value;
}
//Getters and setters
/** #return Collection */
public function getSubjects() {
return $this->comments;
}
/** #param Comment $comment */
public function addSubject(Subject $comment) {
$this->comments->add($comment);
$comment->setUser($this);
}
}

Answer 1

Your entity declaration is incorrect:
* #ORM\ManyToOne(targetEntity="Entity\User", inversedBy="subjects")
This should be either this:
* #ORM\ManyToOne(targetEntity="Subject\Entity\User", inversedBy="subjects")
Or, since the two classes share the same namespace, you can also use this:
* #ORM\ManyToOne(targetEntity="User", inversedBy="subjects")
The targetEntity has to be the fully qualified class name (FQCN), except if referring to a class in the same namespace, in which case the short name may be used (as per the last example above).

Answer 2

In our case, the file name was not the same as the class name: it was just a typo.

Answer 3

I had the same problem. The problem in my case was case-sensitivity.
Bad:
class Package {
/**
* #ORM\OneToMany(targetEntity="PackagUSA", mappedBy="package")
*/
private Collection $packageusas;
}
class Packageusa {
/**
* #ORM\ManyToOne(targetEntity="Package", inversedBy="packageusas")
* #ORM\JoinColumn(name="package_id", referencedColumnName="id")
*/
private Package $package;
}
Good:
class Package {
/**
* #ORM\OneToMany(targetEntity="PackageUSA", mappedBy="package")
*/
private Collection $packageusas;
}
class PackageUSA {
/**
* #ORM\ManyToOne(targetEntity="Package", inversedBy="packageusas")
* #ORM\JoinColumn(name="package_id", referencedColumnName="id")
*/
private Package $package;
}