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I tried to create mapping from existing MySQL database. I got Fatal error:
PHP Fatal error: Call to a member function getConfiguration() on a non-object in /home/chester/workspace/MyProject/src/vendor/doctrine/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php on line 135
with clue in stack trace:
(...)
PHP 7. Doctrine\ORM\Mapping\ClassMetadataFactory->getAllMetadata() /home/chester/workspace/lingus/src/vendor/symfony/src/Symfony/Bundle/DoctrineBundle/Command/ImportMappingDoctrineCommand.php:97
(...)
After googling I found this bug report at Doctrine:
http://www.doctrine-project.org/jira/browse/DDC-939?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel
So I fixed the code in symfony.
It worked.
However - somebody should see, if this bugfix possibly should be applied in some other places in framework - my knowledge about symfony/doctrine is rather small.