准备搭建一个Spring Boot 组合mybatis的项目，数据库采用的是MySQL 8.0.11按照以往的配置，使用插件mybatis-generator-maven-plugin生成代码时，一直报错Could not create connection to database server.如下：
[INFO] Scanning for projects...[INFO] [INFO] ------------------------------------------------------------------------[INFO] Building songci-serv 1.0-SNAPSHOT[INFO] ------------------------------------------------------------------------[INFO] [INFO] --- mybatis-generator-maven-plugin:1.3.5:generate (default-cli) @ songci-serv ---[INFO] Connecting to the Database[INFO] ------------------------------------------------------------------------[INFO] BUILD FAILURE[INFO] ------------------------------------------------------------------------[INFO] Total time: 1.841 s[INFO] Finished at: -08-22T21:32:27+08:00[INFO] Final Memory: 13M/46M[INFO] ------------------------------------------------------------------------[ERROR] Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.5:generate (default-cli) on project songci-serv: Could not create connection to database server. -> [Help 1][ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.[ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles:[ERROR] [Help 1] /confluence/display/MAVEN/MojoExecutionException
经排查是，MySQL8.0版本需要更换驱动为“com.mysql.cj.jdbc.Driver”，之前的“com.mysql.jdbc.Driver”已经不能在MySQL 8.0版本使用了，官方文档链接：/doc/connector-j/8.0/en/connector-j-api-changes.html；
描述如下：The name of the class that implements java.sql.Driver in MySQL Connector/J has changed from com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver. The old class name has been deprecated.
另外mysql-connector-java也推荐更新到8.0的版本（/downloads/connector/j/）。
综上修改以下两点：
1.更新mysql-connector-java版本：
<!-- /artifact/mysql/mysql-connector-java --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.11</version></dependency>
2.更换驱动：
配置好以上两点，运行mybatis-generator-maven-plugin，接着报错如下：
Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.5:generate (default-cli) on project songci-serv: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support. -> [Help 1][ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.
报时区错误，解决方法执行命令给MySQL服务器设置时区为东八区，这个是com.mysql.cj.jdbc.Driver需要指定的：
mysql> set global time_zone='+8:00';Query OK, 0 rows affected
Navicat中命令列介面执行即可。或者在数据库连接配置中加上serverTimezone=GMT%2B8（代表东八区），如下：
connectionURL="jdbc:mysql://127.0.0.1:3306/songci?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8"
