场景

在main/java包下创建了两个类Student和Address ，其中Student类中定义了一个Address类的变量，private Address address；此时在resources目录下的beans.xml配置文件中初始化

问题

    <bean id="address" class="com.kuang.pojo.Address"><property name="address" value="北京"/></bean><bean id="student" class="com.kuang.pojo.Student"><property name="name" value="Penny"/><property name="address" value="北京"/><property name="books" ><array><value>红楼梦</value><value>水浒传</value></array></property><property name="hobbys"><list><value>listen music</value><value>play video game</value></list></property><property name="card"><map><entry key="身份证" value="12345678"/><entry key="学生卡" value="87654321"/></map></property><property name="games"><set><value>wangzherongyao</value><value>yingxioonglianmeng</value></set></property><property name="wife"><null/></property><property name="info"><props><prop key="学号">20200280</prop><prop key="性别">男</prop></props></property></bean>

运行是报错如下

Error creating bean with name 'student' defined in class path resource

Initialization of bean failed;

bean初始化失败

警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'student' defined in class path resource [beans.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'com.kuang.pojo.Address' for property 'address'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.kuang.pojo.Address' for property 'address': no matching editors or conversion strategy found
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'student' defined in class path resource [beans.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'com.kuang.pojo.Address' for property 'address'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.kuang.pojo.Address' for property 'address': no matching editors or conversion strategy foundat org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:628)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953)at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)at MyTest.main(MyTest.java:7)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'com.kuang.pojo.Address' for property 'address'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.kuang.pojo.Address' for property 'address': no matching editors or conversion strategy foundat org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:595)at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:609)at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:219)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1756)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1712)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1452)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)... 11 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.kuang.pojo.Address' for property 'address': no matching editors or conversion strategy foundat org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:262)at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:590)... 17 moreProcess finished with exit code 1

看似报了这么多错误，其实问题只出在一个小细节处

<property name="address" value="北京"/>

给Student类中的address注入时，直接给它value值时错误的，因为Address是一个单独的类，其中含有变量address，已经给它注入过值了

<bean id="address" class="com.kuang.pojo.Address"><property name="address" value="北京"/></bean>

所以这里应该是给student注入时应该是给它链接到address，而不是直接给它value

<property name="address" ref="address"/>

这下就给student注入完成了

Student{name='Penny', address=Address{address='北京'}, books=[红楼梦, 水浒传], hobbys=[listen music, play video game], card={身份证=12345678, 学生卡=87654321}, games=[wangzherongyao, yingxioonglianmeng], wife='null', info={学号=20200280, 性别=男}}

So，有时报一堆错，不要惊慌，可能只是一个小细节错了

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Exception encountered during context initialization - cancelling refresh attempt

场景

问题

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