错误:java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver
1.创建springboot项目遇到的错误:java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver
错误截图:
此时配置文件中mysql相关依赖为:
上网查了资料发现是MySQL版本和配置的区别问题:
JDBC连接Mysql5 com.mysql.jdbc.Driver:
spring:
datasource:
url: jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=UTF-8
JDBC连接Mysql6 com.mysql.cj.jdbc.Driver, 需要指定时区serverTimezone:
spring:
datasource:
url: jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
2.修改后代码如下
pom文件依赖如下:
<!-- mybatis依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.2.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
配置文件如下(application.yml):
spring:
datasource:
#url: jdbc:mysql://dev1.ichangyun.cn:13306/zjl?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
url: jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
username: root
password: admin
# 使用druid数据源
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
# 下面为连接池的补充设置,应用到上面所有数据源中
# 初始化大小,最小,最大
initialSize: 5
minIdle: 5
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM user
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
# 打开PSCache,并且指定每个连接上PSCache的大小
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
spring.datasource.filters: stat,wall
# 通过connectProperties属性来打开mergeSql功能;慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
#useGlobalDataSourceStat: true