java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver

java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at com.baomidou.mybatisplus.generator.config.DataSourceConfig.getConn(DataSourceConfig.java:196)
    at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.handlerDataSource(ConfigBuilder.java:269)
    at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.<init>(ConfigBuilder.java:132)
    at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:92)
    at com.qingmu.springboot.common.Generator.MybatisPlusGenerator.main(MybatisPlusGenerator.java:148)
Exception in thread "main" java.lang.NullPointerException
    at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.getTablesInfo(ConfigBuilder.java:457)
    at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.handlerStrategy(ConfigBuilder.java:281)
    at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.<init>(ConfigBuilder.java:142)
    at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:92)
    at com.qingmu.springboot.common.Generator.MybatisPlusGenerator.main(MybatisPlusGenerator.java:148)

com.mysql.jdbc.Driver 是 mysql-connector-java 5中的
JDBC连接Mysql5 com.mysql.jdbc.Driver:

org.quartz.dataSource.qzDS.driver:com.mysql.jdbc.Driver
org.quartz.dataSource.qzDS.URL:jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=UTF-8

com.mysql.cj.jdbc.Driver 是 mysql-connector-java 6中的
JDBC连接Mysql6 com.mysql.cj.jdbc.Driver， 需要指定时区serverTimezone:

#org.quartz.dataSource.qzDS.driver:com.mysql.cj.jdbc.Driver
#org.quartz.dataSource.qzDS.URL:jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false

如果你用的mysql-connector-java 5，配置的是com.mysql.cj.jdbc.Driver的配置就会报java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver这个错误。

如果你用的mysql-connector-java 6，配置的是com.mysql.jdbc.Driver的配置也会出现错误，总之MySQL版本要与其配置对应好。

原文地址：https://www.cnblogs.com/qingmuchuanqi48/p/11611849.html