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I need to find or to create mysql user federation SPI for keycloak. A database already exists in my application, and I want to keycloak get user-info from the db.

I found an example but when I try to add the federation, I have an exception "Error! Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server."

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What I can to do, to fix it? Or maybe there is an explain/documents how to do it use different way.

Arahni_coder
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  • See "Communications link failure, then it means that the DB isn't reachable at all." section in the highest voted answer. – Shadow Dec 13 '22 at 15:33
  • Thank you for your answer. I found solution to my problem. I start mysql from docker container, and in this case, I should use jdbc:mysql://container_name:3306/my_app?user=root&password=root_password instead of jdbc:mysql://localhost:3306/my_app?user=root&password=root_password – Arahni_coder Dec 13 '22 at 16:16

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