Could not obtain connection to query metadata : Public Key Retrieval is not allowed
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您应该将客户端选项添加到 mysql 连接器中，
allowPublicKeyRetrieval=true
以允许客户端自动从服务器请求公钥。
AllowPublicKeyRetrieval=True
允许恶意代理执行 MITM 攻击以获取纯文本密码，因此默认情况下它是false！必须显式开启。
也可以使用如下配置：
useSSL=false
所以，最终修改 db 配置如下即可：
jdbc:mysql://localhost:3306/db?allowPublicKeyRetrieval=true&useSSL=false
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