今天线上添加定时任务之后 定时任务查询页面报出如上错误，
原因有两点
1.org.quartz.jobStore.useProperties = true 这个属性的意思存储的JobDataMaps是否都为String类型 检查下参数
2.mysql导出blob类型导入问题,导出的blob的sql 如下 ，blob类型已经被破坏 ，可以采用mysql自带的工具导入即可。
quartz报错 Couldn't retrieve job because the BLOB couldn't be deserialized: null
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