Communications link failure The last packet successfully received from the server was 20 millisecon

Running mybatis-generator reports an error

详细错误:
Communications link failure
The last packet successfully received from the server was 20 millisecon

Solution:
Add some parameters to the relevant url link, as shown below
jdbc:mysql://localhost:3500/test?useUnicode=true&characterEncoding=UTF-8&;useSSL=false&rewriteBatchedStatements=true