The target-entity "some entity" cannot be found

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

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

Answer 2

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;
}