Cannot invoke method xxx() on null object

本文转载自查看原文 2021-11-11 15:52 2344 【shardingsphere或sharding-jdbc】

最近在学习shardingsphere分库分表，基于springboot框架，但是运行项目的时候，报个错:

全部错误信息如下

[Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error updating database.  Cause: java.lang.NullPointerException: Cannot invoke method mod() on null object
### The error may exist in com/yangy/shardingsphere/mapper/UserMapper.java (best guess)
### The error may involve com.yangy.shardingsphere.mapper.UserMapper.insert-Inline
### The error occurred while setting parameters
### SQL: INSERT INTO yang_user  ( name, age, sex )  VALUES  ( ?, ?, ? )
### Cause: java.lang.NullPointerException: Cannot invoke method mod() on null object] with root cause

原因

分片键和分片策略中的字段不一致导致

分片策略是基于分片键进行运算的

免责声明！

本站转载的文章为个人学习借鉴使用，本站对版权不负任何法律责任。如果侵犯了您的隐私权益，请联系本站邮箱yoyou2525@163.com删除。

猜您在找 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.catherine.forrealm.about_utils.RealmHelper.findAllStudent()' on a null object reference javaScript错误（一）Cannot call method 'addEventListener' of null Uncaught TypeError: Cannot convert undefined or null to object EL1007E: Property or field 'xxx' cannot be found on null 【踩坑】报错 non-static method xxx() cannot be referenced from a static context MUI 中出现Cannot call method 'addEventListener' of null at html/main.html:521 JSON parse error: Unrecognized token 'xxx': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false'); JavaScript 中出现 Uncaught TypeError: Cannot read property 'XXX' of null的解决思路 Dubbo 直连 Invoke remote method timeout 问题! JAVA深入研究——Method的Invoke方法。