解决You can change this value on the server by setting the ‘max_allowed_packet‘ variable报错

错误提示：

Unsatisfied dependency expressed through field 'jobService';  nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sysJobServiceImpl': Invocation of init method failed;  nested exception is org.quartz.JobPersistenceException: Couldn't store job: Packet for query is too large (2,128 > 1,024).  You can change this value on the server by setting the 'max_allowed_packet' variable.  [See nested exception: com.mysql.cj.jdbc.exceptions.PacketTooBigException: Packet for query is too large (2,128 > 1,024).  You can change this value on the server by setting the 'max_allowed_packet' variable

mysql数据库中的这个这个东西小于加载数据

可以先输入语句查看：show VARIABLES like '%max_allowed_packet%';　查询 value

解决方法： 

 第一种：

设置默认值为１０M：set global max_allowed_packet = 5*1024*1024;

退出命令行，重启mysql服务，再进入。即可

第二种：

如果恢复默认设置：

修改my.ini  在[mysqld]段或者mysql的server配置段进行修改。（终极修改, 修改后重启数据库，永久生效）

　　如下: max_allowed_packet = 5M