The fully qualified name of the bean‘s class, except if it serves only as a parent definition for ch

墨蓝 2023-10-18 22:11 97阅读 0赞

### 报错: ###

![在这里插入图片描述][20190721231741823.]  
Attribute : class  
The fully qualified name of the bean’s class, except if it serves only as a parent definition for child  
bean definitions.

Data Type : string

原因：  
Spring Bean装配与自动装配 中 default-autowire=“constructor” constructor: 与bytype方式类似，主要应用与构造器参数，如果容器中没有构造器一致的bean将抛出异常  
Spring Bean装配与自动装配其中还包括  
default-autowire=“no” : 不做任何操作  
default-autowire="byName " ：  
根据属性自动装配 ，与id属性一样的，并与其属性来进行自动装配  
default-autowire="byType "  
1. 存在与指定属性类型相同的bean 将该属性自动装配  
2.存在多个该类型bean， 将抛出异常  
3.没有找到匹配的bean 什么什么也不用做

解决办法：

**添加该类的无参构造函数：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjE3NjYzOQ_size_16_color_FFFFFF_t_70]

[20190721231741823.]: https://img-blog.csdnimg.cn/20190721231741823.
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjE3NjYzOQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190721232131922.?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjE3NjYzOQ==,size_16,color_FFFFFF,t_70

The fully qualified name of the bean‘s class, except if it serves only as a parent definition for ch

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