## JAVA-MySQL

### mysql8.x版本的数据库在连接的时候报错 java.sql.SQLNonTransientConnectionException: Public Key Retrieval is not allowed

#### 说明

[官方doc](https://mysqlconnector.net/connection-options/)

![image-20230101223712667](assets/image-20230101223712667.png)

**原文：**

 If the user account uses `sha256_password` authentication, the password must be protected during transmission; TLS is the preferred mechanism for this, but if it is not available then RSA public key encryption will be used. To specify the server’s RSA public key, use the `ServerRSAPublicKeyFile` connection string setting, or set `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.

**翻译**

如果用户账号使用sha256_password认证，密码在传输过程中必须进行保护； TLS 是对此的首选机制，但如果它不可用，则将使用 RSA 公钥加密。要指定服务器的 RSA 公钥，请使用 ServerRSAPublicKeyFile 连接字符串设置，或设置 AllowPublicKeyRetrieval=True 以允许客户端自动从服务器请求公钥。请注意，AllowPublicKeyRetrieval=True 可能允许恶意代理执行 MITM 攻击以获取明文密码，因此默认情况下为 False，必须明确启用。

#### 解决方法

只要在url的后边加上allowPublicKeyRetrieval=true即可

```yaml
url: jdbc:mysql://10.8.0.18:3306/newerp?serverTimezone=UTC&useUnicode=true&charaterEncoding=utf8&autoReconnect=true&useAffectedRows=true
```