Record idea error report,
1. Reference the external library mysql-connector-java-8.0.26
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
2. Introduce the latest version of c3p0
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.5</version>
</dependency>
3. The driver address of the connection is "com.mysql.cj.jdbc.Driver"
Change the connection driver to: com.mysql.cj.jdbc.Driver