org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'board' available

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今天学习了Spring框架的入门，然后做练习遇到很多小bug，记录一下

1.cvc-complex-type.2.4.d: Invalid content was found starting with element 'bean'. No child element is expected at this point.标签中没有定义该子标签

2.Bean Definition Parsing Exception(Bean定义解析异常)
<bean id="名字随便取你用着方便就行" class="类的全路径">
例如：
<bean id="user" class="com.yc.bean.UesrBean">//鼠标定位到class属性值上，路径正确就可以定位
到该类

3.org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'board'
available：在对应的xml文件中没有bean的id为'board' 

4.org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unexpected failure during bean definition parsing  Offending resource: class path resource [IOC01.xml]   Bean 'board'; nested exception is
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration 
解答：bean中忘记写class属性值了

5.Spring中list标签里面的值默认的类型为java.lang.String

6.用构造方法注入空属性值和创建空值<null></null>

构造函数给属性赋空值任然会创建对象，且对象不等价null