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Connection Java-MySql : Public Key Retrieval is not allowed

You should add client option to your mysql-connector allowPublicKeyRetrieval=true to allow the client to automatically request the public key from the server. Note that AllowPublicKeyRetrieval=True could allow a malicious proxy to perform a MITM attack to get the plaintext password, so it is False by default and must be explicitly enabled.
you could also try adding useSSL=false when you use it for testing/develop purposes
example:
jdbc:mysql://localhost:3306/db?allowPublicKeyRetrieval=true&useSSL=false

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