使用spring注入时出现is not writable or has an invalid setter method

本文详细解析了在使用Spring框架时遇到的Bean创建异常和属性注入错误,通过实例展示了如何在Service实现类中正确定义getter和setter方法,并强调了属性名大小写一致性的重要性。同时,文章补充了属性注入时大小写敏感的知识点,帮助开发者避免常见的配置错误。

在web-application-config.xml中定义

<bean id="employeeServiceDest" class="com.service.EmployeeServiceImpl">
      <flex:remoting-destination />
    <property name="EsysDao" ref="EsysDao"/>
 </bean>

 结果,运行时出错:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeServiceDest' defined in ServletContext resource [/WEB-INF/web-application-config.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'esyerDao' of bean class [com.service.EmployeeServiceImpl]:

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

其中,“Bean property 'esyerDao' is not writable or has an invalid setter method”就是关键错误。

原来,需要在EmployeeServiceImpl中定义set和get方法。

  public void setEsysDao (EsysDao esysdao) {
     this.esyerDao= esysdao;
    }

    public EsysDao getEsysDao () {
        return esysDao;
    }

------------------------

补充,大小写是有严格区分的, <property name="EsyerDao" ref="EsyerDao"/> 和  <property name="esyerDao" ref="EsyerDao"/>是不一样的,对于name="esyerDao",在EmployeeServiceImpl中定义set和get方法就要用小写的setesysDao和getesysDao:
  public void setesysDao(EsysDao esysdao) {
     this.esysDao= esysdao;
    }

    public EsysDao getesysDao() {
        return esysDao;
    }

-----------------------------------------------------------------

再补充,每个 <property name="xxxx"  ref="xxxxx"/> ,都必须在class中定义set和get方法。

一个都不能少,确实是个细致的工作。

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'httpInvokerConfig': Unsatisfied dependency expressed through field 'appMerchantService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'appMerchantDec' defined in ServletContext resource [/WEB-INF/tpaic-auto-net-servlet.xml]: Cannot resolve reference to bean 'dispatchService' while setting bean property 'dispatch'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dispatchService' defined in ServletContext resource [/WEB-INF/tpaic-auto-net-servlet.xml]: Invocation of init method failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.tpaic.nonmotor.biz' defined in class path resource [com/tpaic/nonmotor/biz/beanRefContext.xml]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.context.support.ClassPathXmlApplicationContext]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'brandAutoTypeService' defined in class path resource [com/tpaic/nonmotor/biz/brand-service-context.xml]: Cannot resolve reference to bean 'contractBoSupport' while setting bean property 'contractBoSupport'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'contractBoSupport' defined in class path resource [com/tpaic/nonmotor/biz/service-bo.xml]: Cannot resolve reference to bean 'inquireDetailService' while setting bean property 'inquireDetailService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'inquireDetailService' defined in class path resource [com/tpaic/nonmotor/biz/service-context-part.xml]: Cannot resolve reference to bean 'inquireDetailBoService' while setting bean property 'inquireDetailBoService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'inquireDetailBoService' defined in class path resource [com/tpaic/nonmotor/biz/service-bo.xml]: Cannot resolve reference to bean 'applyPolicyBo' while setting bean property 'applyPolicyBo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'applyPolicyBo' defined in class path resource [com/tpaic/nonmotor/biz/service-bo.xml]: Cannot resolve reference to bean 'commonParameterSupport' while setting bean property 'common'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'commonParameterSupport' defined in class path resource [com/tpaic/nonmotor/biz/service-context-part.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'aggregatedSearchService' of bean class [com.tpaic.nonmotor.biz.util.CommonParameterSupport]: Bean property 'aggregatedSearchService' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
06-11
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