Uncaught exception 'Doctrine\ORM\ORMException' with message 'The EntityManager is closed - doctrine-orm

Question

How to pass doctrine entity manager to some class constructor?
For example, i set-up and create entity manager $em in file _someAction.php.
In the same file i instantiate the class, and pass entity manager to the constructor, but em does not work in the class. I am getting
Fatal error: Uncaught exception 'Doctrine\ORM\ORMException' with message 'The EntityManager is closed.'
class dealErrCl
use Doctrine\ORM\EntityManager;
use someNamespace\LogErr;
class dealErrCl {
private $em; //entity manager to save error to the entity
public function __construct( \Doctrine\ORM\EntityManager $em ) {
$this->em = $em;
}
public function flush($errArr) {
$this->le = new LogErr();
if( isset($errArr['title']) ) {
$this->le->setTitle($errArr['title']);
}
/*...*/
$this->em->persist($this->le);
$this->em->flush();
}
_someAction.php
include DbCon.php; // configures doctrine and creates $em. If i use this em in this file, it works, but if i tryt to pass it to some class constructor, it gives Fatal error.
use LogBundle\Components\ErrC\dealErrCl;
$dealErrIn = new dealErrCl($em);
If i use this $em in _someAction.php file, it works, but if i tryt to pass it to some dealErrCl constructor, it gives Fatal error.

Answer 1

It means that there is an error during the flush, which closes the entity manager.
There maybe many possible errors:
1) setting null on non-null field
2) using reserved keywords for field name
http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#quoting-reserved-words
POSTGRE reserved words :
https://www.postgresql.org/docs/7.3/static/sql-keywords-appendix.html
MYSQL reserved words:
https://dev.mysql.com/doc/refman/5.7/en/keywords.html
Thus better always enclose all flush, inside a try-catch block.