attempted to return null from a method with a primitive return type (int)
报错背景 我在使用springboot做登录查询的时候报错了,我输入的是数据库中不存在的用户名与密码,返回值应该是null; 报错信息 解决方案 把返回值类型改成Integer 我来运行看看,是否真的有效 还是报错! 网上说把dao service返回值都改成Integer 然后再control层里面 也是Integer接受值，这样写 终于不报错了！太坎坷了！
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- 1. [mybatis]............attempted to return null from a method with a primitive return type (int).
- 2. RoleMapper.deleteRole attempted to return null from a method with a primitive return type (int).
- 3. （MyBatis）insertStudent attempted to return null from a method with a primitive return type (int).
- 4. Mybatis：Mapper method attempted to return null from a method
- 5. 【java】Mybatis返回int类型为空时报错 attempted to return null from a method with a primitive return type (int）
- 6. mybatis使用xml实现发生的异常之一return null from a method with a primitive return type (int)
- 7. MyBatis Error：BindingException Mapper method attempted to return null
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- 9. Cannot return from outside a function or method
- 10. Cannot return from outside a function or method.