【instance method '*****' not found (return type defaults to 'id')】的更多相关文章

instance method '*****' not found (return type defaults to 'id')

博文转载至 http://blog.csdn.net/cerastes/article/details/38025801 return type defaultsnot foundiOSwarning 在一个类里面引用另外一个类的实例方法,警告方法没有找到. 原因.h文件没有应用,只在头文件中申明了@class #import相应的.h文件就可以…

解决C语言程序报错：return type defaults to‘int’

下面是通过自定义一个函数printN,之后在main函数中调用printN,使得可以通过输入整数N,将从1到N的全部整数都打印出来的程序. 但是在编译过程中却报错: return type defaults to 'int' 产生报错的原因: printN的默认返回值类型是int类型的,这样调用printN函数的main函数就需要定义为: int main() 而不是: main() 产生报错的程序: #include<stdio.h> //自定义printN函数 void printN (i…

Error:java: Can‘t generate mapping method with primitive return type.报错

原因:Spring项目中使用了JPA以及Mybatis–mapper文件注解引错包导致编译错误 解决: 错误:import org.mapstruct.Mapper;正确路径:import org.apache.ibatis.annotations.Mapper;学习小笔记:JPA 1.什么是jpa呢?JPA顾名思义就是Java Persistence API的意思,是JDK 5.0注解或XML描述对象-关系表的映射关系,并将运行期的实体对象持久化到数据库中.12.jpa具有什么优势?2.1标准…

Generic method return type

Here's the Animal class: public class Animal{ private Map<String,Animal> friends =new HashMap<String,Animal>(); public void addFriend(String name,Animal animal){ friends.put(name,animal);} public Animal callFriend(String name){return friends.g…

delete attempted to return null from a method with a primitive return type (int)

今天被自己给蠢死了 今天在代码中遇到这个错误, 百度翻译一下:映射方法,从一org.system.mapper.child.chmorganizationexaminationmapper.delete返回零作为一个原始的方法的返回类型(int). org.apache.ibatis.binding.BindingException: Mapper method 'org.system.mapper.child.ChmOrganizationExaminationMapper.delete at…

rg.apache.ibatis.binding.BindingException: Mapper method 'com.dao.Cameao.getOnlineDayRation attempted to return null from a method with a primitive return type (float)

本文为博主原创,未经允许不得转载: 异常展示如下: org.apache.ibatis.binding.BindingException: Mapper method 'com.dao.Cameao.getOnlineDayRation attempted to return null from a method with a primitive return type (float). at org.apache.ibatis.binding.MapperMethod.execute(Mapp…

mysql查询null异常:attempted to return null from a method with a primitive return type

select sum(deposit_amount)from tb_commission_ib_day mysql查询时报异常: attempted to return null from a method with a primitive return type 是因为查询时结果是 null, 需要给默认值 select IFNULL(sum(deposit_amount),0) from tb_commission_ib_day…

org.apache.ibatis.binding.BindingException: Mapper method 'attempted to return null from a method with a primitive return type (long).

一.问题描述 今天发现测试环境报出来一个数据库相关的错误 org.apache.ibatis.binding.BindingException: Mapper method 'attempted to return null from a method with a primitive return type (long). 二.问题根源 经过查询后发现,Mybatis 在查询id信息的时候返回类型为long ,没有留意long和Long的区别. Long是long的包装类,long是基本数据类…

attempted to return null from a method with a primitive return type (int).

java接口文件 package com.cyb.ms.mapper; import org.apache.ibatis.annotations.Param; public interface AccountMapper { void update(@Param("name") String name, @Param("money") int money); int queryMoney(String name); } xml文件 <?xml version=…

Bean property ‘mapperHelper’ is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?

spring boot 报错: Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property ‘mapperHelper’ of bean class [org.mybatis.spring.mapper.MapperFactoryBean]: Bean property ‘mapperHelper’ is not writable or has an invalid setter meth…