name 'printer' defined in class path resource [applicationContext.xml]: Error setting property value
2024-07-12 04:53:20
1、错误提示：
Error setting property values：说找不到Printer中的设置属性值，然后去看一下，配置文件
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'printer' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'ink' of bean class [myprinter.Printer]: Bean property 'ink' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1685)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1400)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1083)at myspring.testHelloSpring.main(testHelloSpring.java:21)
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'ink' of bean class [myprinter.Printer]: Bean property 'ink' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:243)at org.springframework.beans.AbstractNestablePropertyAccessor.processLocalProperty(AbstractNestablePropertyAccessor.java:426)at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:278)at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:266)at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:97)at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:77)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1681)... 9 more
2、配置文件内容：
配置文件中显示，id="printer"下，有两个属性值，分别是：ink与paper。找不到这两个值，说明：Printer类中没有进行设置。然后，找到Printer类：
<!-- Printer --><bean id="colorInk" class="myprinter.ColorInk"/><bean id="greyInk" class="myprinter.GreyInk"/><bean id="a4Paper" class="myprinter.TextPaper"><property name="charPerline" value="10"/><property name="linePerPage" value="8"/></bean><bean id="b5Paper" class="myprinter.TextPaper"><property name="charPerLine" value="6"/><property name="LinePerPage" value="5"/></bean><bean id="printer" class="myprinter.Printer"><property name="ink" ref="colorInk"/><property name="paper" ref="b5Paper"/></bean>
3、Printer类：
发现有两个变量，没有对其进行setter与getter，这两个方法恰巧是配置文件用来进行获取值得方法，也可以说进行了方法注入。
package myprinter;public class Printer {private Ink ink=null;private Paper paper=null;public void print(String str) {System.out.println("使用"+ink.getColor(255, 200, 0)+"颜色打印：\n");for(int i=0;i<str.length();++i) {paper.putInChar(str.charAt(i));}System.out.println(paper.getContent());}}所以，补全方法实现：
package myprinter;public class Printer {private Ink ink=null;private Paper paper=null;public void print(String str) {System.out.println("使用"+ink.getColor(255, 200, 0)+"颜色打印：\n");for(int i=0;i<str.length();++i) {paper.putInChar(str.charAt(i));}System.out.println(paper.getContent());}public Ink getInk() {return ink;}public void setInk(Ink ink) {this.ink = ink;}public Paper getPaper() {return paper;}public void setPaper(Paper paper) {this.paper = paper;}}
最后，便可以进行实现了。
使用#ffc800颜色打印：jdkddn
mbfjkd
sbskjd
hsjkhf
djkhlk
==第1页==hflkhd
fkljhk
alncxj
skhsjf
dskjdh
==第2页==a.lkfh
jlkahn
jflkan
knfkfk
jkfjkl
==第3页==dkjsld
jlakcn
jkanck
lcahd;
;;;;;;
==第4页==;fklnc
mxznmz
,n,.zm
jiklas
djiaon
==第5页==akljkl
hjlhca
jcnlkn
la;/hj
agshyd
==第6页==gayuuw
qloetg
sywqiu
wujghb
ljksah
==第7页==uahis;
hy;aso
du;oui
opwd==第8页==
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