Jira issue originally created by user jonathanpete:
When an entity is bound as a query parameter, query caching with APC fails with error message:
Catchable fatal error: Object of class XXX could not be converted to string in /libs/doctrine-orm/Doctrine/DBAL/Connection.php on line 1081
If I bind with entity's primary key field, everything works fine.
Comment created by @beberlei:
Fixed and merged into 2.2 branch.
A rebase onto the 2.1.x branch would take a rewrite, since the code is completly new and since there is a simple workaround ($entity->getId()) when binding i will not backported it into the 2.1.x branch.
Issue was closed with resolution "Fixed"